[31] | 1 | # X-Plane Remote Access client module
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| 2 | #-------------------------------------------------------------------------------
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| 3 |
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| 4 | import os
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| 5 | import struct
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| 6 | import array
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| 7 |
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| 8 | #-------------------------------------------------------------------------------
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| 9 |
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[66] | 10 | ## @package xplra
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| 11 | #
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[70] | 12 | # Python client module for the X-Plane Remote Access plugin
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[66] | 13 |
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| 14 | #-------------------------------------------------------------------------------
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| 15 |
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| 16 | ## Protocol command: query the value of a single dataref
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[31] | 17 | COMMAND_GET_SINGLE = 0x01
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| 18 |
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[66] | 19 | ## Protocol command: set the value of a single dataref
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[31] | 20 | COMMAND_SET_SINGLE = 0x02
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| 21 |
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[66] | 22 | ## Protocol command: query the value of several datarefs
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[31] | 23 | COMMAND_GET_MULTI = 0x03
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| 24 |
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[66] | 25 | ## Protocol command: set the value of several datarefs
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[31] | 26 | COMMAND_SET_MULTI = 0x04
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| 27 |
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[66] | 28 | ## Protocol command: register a multi-dataref getter
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[31] | 29 | COMMAND_REGISTER_GET_MULTI = 0x11
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| 30 |
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[66] | 31 | ## Protocol command: unregister a multi-dataref getter
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[31] | 32 | COMMAND_UNREGISTER_GET_MULTI = 0x12
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| 33 |
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[66] | 34 | ## Protocol command: execute a registered multi-dataref getter
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[31] | 35 | COMMAND_EXECUTE_GET_MULTI = 0x13
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| 36 |
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[66] | 37 | ## Protocol command: register a multi-dataref setter
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[31] | 38 | COMMAND_REGISTER_SET_MULTI = 0x21
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| 39 |
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[66] | 40 | ## Protocol command: unregister a multi-dataref setter
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[31] | 41 | COMMAND_UNREGISTER_SET_MULTI = 0x22
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| 42 |
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[66] | 43 | ## Protocol command: execute a registered multi-dataref setter
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[31] | 44 | COMMAND_EXECUTE_SET_MULTI = 0x23
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| 45 |
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[66] | 46 | ## Protocol command: get the versions of X-Plane, XPLM and XPLRA
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[36] | 47 | COMMAND_GET_VERSIONS = 0x31
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| 48 |
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[66] | 49 | ## Protocol command: reload all plugins
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[40] | 50 | COMMAND_RELOAD_PLUGINS = 0x32
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| 51 |
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[66] | 52 | ## Protocol command: show a message to the pilot
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[40] | 53 | COMMAND_SHOW_MESSAGE = 0x41
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| 54 |
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[66] | 55 | ## Protocol command: register hotkeys
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[52] | 56 | COMMAND_REGISTER_HOTKEYS = 0x51
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| 57 |
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[66] | 58 | ## Protocol command: query the status of registered hotkeys
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[52] | 59 | COMMAND_QUERY_HOTKEYS = 0x52
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| 60 |
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[66] | 61 | ## Protocol command: unregister hotkeys
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[52] | 62 | COMMAND_UNREGISTER_HOTKEYS = 0x53
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| 63 |
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[66] | 64 | ## Protocol type constant: integer
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[31] | 65 | TYPE_INT = 0x01
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| 66 |
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[66] | 67 | ## Protocol type constant: single-precision floating point
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[31] | 68 | TYPE_FLOAT = 0x02
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| 69 |
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[66] | 70 | ## Protocol type constant: double-precision floating point
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[31] | 71 | TYPE_DOUBLE = 0x03
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| 72 |
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[66] | 73 | ## Protocol type constant: array of single-precision floating point values
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[31] | 74 | TYPE_FLOAT_ARRAY = 0x11
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| 75 |
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[66] | 76 | ## Protocol type constant: array of integers
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[31] | 77 | TYPE_INT_ARRAY = 0x12
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| 78 |
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[66] | 79 | ## Protocol type constant: array of bytes
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[31] | 80 | TYPE_BYTE_ARRAY = 0x13
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| 81 |
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[66] | 82 | ## Protocol result: OK
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[31] | 83 | RESULT_OK = 0x00
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| 84 |
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[66] | 85 | ## Protocol result: an invalid command was sent
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[31] | 86 | RESULT_INVALID_COMMAND = 0x01
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| 87 |
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[66] | 88 | ## Protocol result: an unknown dataref was attempted to query or set
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[31] | 89 | RESULT_UNKNOWN_DATAREF = 0x02
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| 90 |
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[66] | 91 | ## Protocol result: invalid type
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[31] | 92 | RESULT_INVALID_TYPE = 0x03
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| 93 |
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[66] | 94 | ## Protocol result: invalid length
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[31] | 95 | RESULT_INVALID_LENGTH = 0x04
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| 96 |
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[66] | 97 | ## Protocol result: invalid offset
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[31] | 98 | RESULT_INVALID_OFFSET = 0x05
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| 99 |
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[66] | 100 | ## Protocol result: invalid count
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[31] | 101 | RESULT_INVALID_COUNT = 0x06
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| 102 |
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[66] | 103 | ## Protocol result: invalid ID
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[31] | 104 | RESULT_INVALID_ID = 0x07
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| 105 |
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[66] | 106 | ## Protocol result: invalid duration
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[40] | 107 | RESULT_INVALID_DURATION = 0x08
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| 108 |
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[66] | 109 | ## Protocol result: other error
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[31] | 110 | RESULT_OTHER_ERROR = 0xff
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| 111 |
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[66] | 112 | ## Hotkey modifier: Shift
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[52] | 113 | HOTKEY_MODIFIER_SHIFT = 0x0100
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| 114 |
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[66] | 115 | ## Hotkey modifier: Control
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[52] | 116 | HOTKEY_MODIFIER_CONTROL = 0x0200
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| 117 |
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[31] | 118 | #-------------------------------------------------------------------------------
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| 119 |
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| 120 | class ProtocolException(Exception):
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| 121 | """Exception to signify protocol errors."""
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[66] | 122 |
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| 123 | ## mapping from result codes to their string representation
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[31] | 124 | _message = { RESULT_INVALID_COMMAND : "invalid command",
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| 125 | RESULT_UNKNOWN_DATAREF : "unknown dataref",
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| 126 | RESULT_INVALID_TYPE : "invalid type",
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| 127 | RESULT_INVALID_LENGTH : "invalid length",
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| 128 | RESULT_INVALID_OFFSET : "invalid offset",
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| 129 | RESULT_INVALID_COUNT : "invalid count",
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| 130 | RESULT_INVALID_ID : "invalid ID",
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[40] | 131 | RESULT_INVALID_DURATION : "invalid duration",
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[31] | 132 | RESULT_OTHER_ERROR : "other error" }
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| 133 |
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[66] | 134 | ## @var resultCode
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| 135 | # the result code, one of the RESULT_XXX constants
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| 136 | ## @var parameter
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| 137 | # an optional parameter for the result
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| 138 |
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[31] | 139 | @staticmethod
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| 140 | def getMessage(resultCode):
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| 141 | """Get the message for the given result code."""
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| 142 | if resultCode in ProtocolException._message:
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| 143 | return ProtocolException._message[resultCode]
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| 144 | else:
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| 145 | return "unknown error code " + `resultCode`
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| 146 |
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[40] | 147 | def __init__(self, resultCode, parameter = None):
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[66] | 148 | """Construct the exception."""
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[40] | 149 | message = "xplra.ProtocolException: " + self.getMessage(resultCode)
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| 150 | if parameter is not None:
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| 151 | if resultCode==RESULT_UNKNOWN_DATAREF:
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| 152 | message += " (# %d)" % (parameter,)
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| 153 |
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| 154 | super(ProtocolException, self).__init__(message)
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[31] | 155 | self.resultCode = resultCode
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[40] | 156 | self.parameter = parameter
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[31] | 157 |
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| 158 | #-------------------------------------------------------------------------------
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| 159 |
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[64] | 160 | if os.name=="nt":
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| 161 | import win32file
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| 162 | import io
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| 163 |
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| 164 | class Win32NamedPipe(io.RawIOBase):
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| 165 | """A stream object to represent a Win32 named pipe."""
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[66] | 166 | ## @var _handle
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| 167 | # the Windows file handle for the pipe
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| 168 |
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[64] | 169 | def __init__(self, name):
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| 170 | """Construct the pipe with the given name."""
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| 171 | self._handle = win32file.CreateFile(name,
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| 172 | win32file.GENERIC_READ |
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| 173 | win32file.GENERIC_WRITE,
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| 174 | 0, None,
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| 175 | win32file.OPEN_EXISTING, 0, None)
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| 176 |
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| 177 | def close(self):
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| 178 | """Close the pipe, if not closed already."""
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| 179 | if self._handle is not None:
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| 180 | win32file.CloseHandle(self._handle)
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| 181 | self._handle = None
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| 182 |
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| 183 | @property
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| 184 | def closed(self):
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| 185 | """Determine if the pipe is closed or not."""
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| 186 | return self._handle is None
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| 187 |
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| 188 | def fileno(self):
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| 189 | """Get the file number, which is impossible."""
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| 190 | raise IOError("Win32NamedPipe.fileno: not supported")
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| 191 |
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| 192 | def flush(self):
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| 193 | """Flush the stream."""
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| 194 | pass
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| 195 |
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| 196 | def isatty(self):
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| 197 | """Determine if the stream is a terminal, which it is not."""
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| 198 | return False
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| 199 |
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| 200 | def read(self, n = -1):
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| 201 | """Read at most the given number of bytes from the stream."""
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| 202 | if n==-1:
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| 203 | return self.readall()
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| 204 | else:
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| 205 | (error, data) = win32file.ReadFile(self._handle, n)
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| 206 | return data
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| 207 |
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| 208 | def readable(self):
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| 209 | """Determine if the stream is readable, which it is."""
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| 210 | return self._handle is not None
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| 211 |
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| 212 | def readall(self):
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| 213 | """Read all bytes from the stream, which is not supported."""
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| 214 | raise IOError("Win32NamedPipe.readall: not supported")
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| 215 |
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| 216 | def readinto(self, buffer):
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| 217 | """Read into the given buffer."""
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| 218 | (error, data) = win32file.ReadFile(self._handle, len(buffer))
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| 219 | length = len(data)
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| 220 | buffer[:length] = data
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| 221 | return length
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| 222 |
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| 223 | def readline(self, limit = -1):
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| 224 | """Read a line, which is currently not supported."""
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| 225 | raise IOError("Win32NamedPipe.readline: not supported")
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| 226 |
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| 227 | def readlines(self, hint = -1):
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| 228 | """Read lines, which is currently not supported."""
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| 229 | raise IOError("Win32NamedPipe.readlines: not supported")
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| 230 |
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| 231 | def seek(self, offset, whence = io.SEEK_SET):
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| 232 | """Seek in the stream, which is not supported."""
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| 233 | raise IOError("Win32NamedPipe.seek: not supported")
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| 234 |
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| 235 | def seekable(self):
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| 236 | """Determine if the stream is seekable, which it is not."""
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| 237 | return False
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| 238 |
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| 239 | def tell(self):
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| 240 | """Get the current position, which is not supported."""
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| 241 | raise IOError("Win32NamedPipe.tell: not supported")
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| 242 |
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| 243 | def truncate(self, size = None):
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| 244 | """Truncate the stream, which is not supported."""
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| 245 | raise IOError("Win32NamedPipe.truncate: not supported")
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| 246 |
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| 247 | def writable(self):
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| 248 | """Determine if the stream is writable, which it is."""
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| 249 | return self._handle is not None
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| 250 |
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| 251 | def write(self, buffer):
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| 252 | """Write the given buffer into the stream."""
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| 253 | (error, written) = win32file.WriteFile(self._handle, buffer.tobytes())
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| 254 | return written
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| 255 |
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| 256 | def writelines(self, lines):
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| 257 | """Write the given lines, which is not supported."""
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| 258 | raise IOError("Win32NamedPipe.writelines: not supported")
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| 259 |
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| 260 | #-------------------------------------------------------------------------------
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| 261 |
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[31] | 262 | class XPlane(object):
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| 263 | """The main class representing the connection to X-Plane."""
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| 264 |
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[66] | 265 | ## @var _stream
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| 266 | # the data stream used to communicate with the plugin
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| 267 | ## @var _multiBuffers
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| 268 | # the list of multi-dataref buffers belonging to this object
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| 269 |
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[31] | 270 | @staticmethod
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| 271 | def _packLength(x):
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| 272 | """Pack the given integer as a variable-length value."""
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| 273 | s = ""
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| 274 | while True:
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| 275 | y = x&0x7f
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| 276 | x >>= 7
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| 277 | if x>0: y |= 0x80
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| 278 | s += struct.pack("B", y)
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| 279 | if x==0:
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| 280 | return s
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| 281 |
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| 282 | @staticmethod
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| 283 | def _packString(s):
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| 284 | """Pack the given string."""
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| 285 | return XPlane._packLength(len(s)) + s
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| 286 |
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| 287 | def __init__(self):
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| 288 | """Construct the object."""
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| 289 | self._stream = None
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[56] | 290 | self._multiBuffers = []
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[31] | 291 |
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| 292 | def connect(self):
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| 293 | """Try to connect to X-Plane."""
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| 294 | if self._stream is not None:
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| 295 | return
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| 296 |
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| 297 | if os.name=="nt":
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[64] | 298 | pipe = Win32NamedPipe(r'\\.\pipe\\xplra')
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| 299 | self._stream = io.BufferedRWPair(pipe, pipe)
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[31] | 300 | else:
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| 301 | import socket
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| 302 | s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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| 303 | s.connect("/tmp/xplra-" + os.environ["LOGNAME"])
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| 304 | self._stream = s.makefile()
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| 305 |
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[56] | 306 | for multiBuffer in self._multiBuffers:
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| 307 | multiBuffer._reregister()
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| 308 |
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[31] | 309 | @property
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| 310 | def isConnected(self):
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| 311 | """Determine if we are connected to the simulator."""
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| 312 | return self._stream is not None
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| 313 |
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[34] | 314 | def createMultiGetter(self):
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| 315 | """Create a new multi-dataref getter for this X-Plane object."""
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[56] | 316 | multiGetter = MultiGetter(self)
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| 317 | self._multiBuffers.append(multiGetter)
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| 318 | return multiGetter
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[34] | 319 |
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[35] | 320 | def createMultiSetter(self):
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| 321 | """Create a new multi-dataref setter for this X-Plane object."""
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[56] | 322 | multiSetter = MultiSetter(self)
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| 323 | self._multiBuffers.append(multiSetter)
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| 324 | return multiSetter
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| 325 |
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| 326 | def destroyMultiBuffer(self, multiBuffer):
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| 327 | """Destroy the given multi-dataref buffer.
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| 328 |
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| 329 | It actually removes it from the list of multiple buffers and
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| 330 | unregisters it safely.
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| 331 |
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| 332 | Returns the result of the safe unregistration if the buffer was found,
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| 333 | None otherwise.
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| 334 | """
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| 335 | if multiBuffer in self._multiBuffers:
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| 336 | self._multiBuffers.remove(multiBuffer)
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| 337 | return multiBuffer.unregisterSafely()
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| 338 | else:
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| 339 | return None
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[35] | 340 |
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[36] | 341 | def getVersions(self):
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| 342 | """Get the versions of X-Plane, XPLM and XPLRA as a tuple."""
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| 343 | self._writeU8(COMMAND_GET_VERSIONS)
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| 344 | self._flush()
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| 345 | self._checkResult()
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| 346 | return (self._readS32(), self._readS32(), self._readS32())
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| 347 |
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[40] | 348 | def reloadPlugins(self):
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| 349 | """Reload the plugins in X-Plane.
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| 350 |
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| 351 | After this, this connection becomes invalid."""
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| 352 | self._writeU8(COMMAND_RELOAD_PLUGINS)
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| 353 | self._flush()
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| 354 | self._checkResult();
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| 355 |
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[31] | 356 | def getInt(self, name):
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| 357 | """Get the value of the integer dataref with the given name."""
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| 358 | return self._getSingle(name, TYPE_INT)
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| 359 |
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| 360 | def getFloat(self, name):
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| 361 | """Get the value of the float dataref with the given name."""
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| 362 | return self._getSingle(name, TYPE_FLOAT)
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| 363 |
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| 364 | def getDouble(self, name):
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| 365 | """Get the value of the double dataref with the given name."""
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| 366 | return self._getSingle(name, TYPE_DOUBLE)
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| 367 |
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| 368 | def getFloatArray(self, name, length = -1, offset = 0):
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| 369 | """Get the value of the float array dataref with the given name."""
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| 370 | return self._getSingle(name, TYPE_FLOAT_ARRAY, length, offset)
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| 371 |
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| 372 | def getIntArray(self, name, length = -1, offset = 0):
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| 373 | """Get the value of the integer array dataref with the given name."""
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| 374 | return self._getSingle(name, TYPE_INT_ARRAY, length, offset)
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| 375 |
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| 376 | def getByteArray(self, name, length = -1, offset = 0):
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| 377 | """Get the value of the byte array dataref with the given name."""
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| 378 | return self._getSingle(name, TYPE_BYTE_ARRAY, length, offset)
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| 379 |
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| 380 | def getString(self, name, offset = 0):
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| 381 | """Get the value of the byte array dataref with the given name as a
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| 382 | string."""
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[32] | 383 | s = ""
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| 384 | for b in self.getByteArray(name, offset = offset):
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| 385 | if b==0: break
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| 386 | s += chr(b)
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| 387 | return s
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| 388 |
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| 389 | def setInt(self, name, value):
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| 390 | """Set the value of the integer dataref with the given name."""
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| 391 | self._setSingle(name, TYPE_INT, value)
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| 392 |
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| 393 | def setFloat(self, name, value):
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| 394 | """Set the value of the float dataref with the given name."""
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| 395 | self._setSingle(name, TYPE_FLOAT, value)
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| 396 |
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| 397 | def setDouble(self, name, value):
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| 398 | """Set the value of the double dataref with the given name."""
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| 399 | self._setSingle(name, TYPE_DOUBLE, value)
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| 400 |
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| 401 | def setFloatArray(self, name, value, offset = 0):
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| 402 | """Set the value of the float array dataref with the given name."""
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| 403 | self._setSingle(name, TYPE_FLOAT_ARRAY, value, offset = offset)
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| 404 |
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| 405 | def setIntArray(self, name, value, offset = 0):
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| 406 | """Set the value of the integer array dataref with the given name."""
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| 407 | self._setSingle(name, TYPE_INT_ARRAY, value, offset = offset)
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| 408 |
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| 409 | def setByteArray(self, name, value, offset = 0):
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| 410 | """Set the value of the byte array dataref with the given name."""
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| 411 | self._setSingle(name, TYPE_BYTE_ARRAY, value, offset = offset)
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| 412 |
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| 413 | def setString(self, name, value, length, offset = 0):
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| 414 | """Set the value of the byte array dataref with the given name from a
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| 415 | string.
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| 416 |
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| 417 | The string will be padded with 0's so that its length is the given
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| 418 | one."""
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| 419 | value = [ord(c) for c in value[:length]]
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| 420 | value += [0] * (length - len(value))
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| 421 | self.setByteArray(name, value, offset)
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[31] | 422 |
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[40] | 423 | def showMessage(self, message, duration):
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| 424 | """Show a message in the simulator window for the given duration.
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| 425 |
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| 426 | The duration is a floating-point number denoting seconds."""
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| 427 | self._writeU8(COMMAND_SHOW_MESSAGE)
|
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| 428 | self._writeString(message)
|
---|
| 429 | self._writeFloat(duration)
|
---|
| 430 | self._flush()
|
---|
| 431 | self._checkResult()
|
---|
| 432 |
|
---|
[52] | 433 | def registerHotkeys(self, hotkeyCodes):
|
---|
| 434 | """Register the given hotkey codes for watching."""
|
---|
| 435 | self._writeU8(COMMAND_REGISTER_HOTKEYS)
|
---|
| 436 | self._writeU32(len(hotkeyCodes))
|
---|
| 437 | for hotkeyCode in hotkeyCodes:
|
---|
| 438 | self._writeU16(hotkeyCode)
|
---|
| 439 | self._flush()
|
---|
| 440 | self._checkResult()
|
---|
| 441 |
|
---|
| 442 | def queryHotkeys(self):
|
---|
| 443 | """Query the state of the hotkeys registered previously"""
|
---|
| 444 | self._writeU8(COMMAND_QUERY_HOTKEYS)
|
---|
| 445 | self._flush()
|
---|
| 446 | self._checkResult()
|
---|
| 447 |
|
---|
| 448 | length = self._readU32()
|
---|
| 449 | states = []
|
---|
| 450 | for i in range(0, length):
|
---|
[53] | 451 | states.append(self._readU8()!=0)
|
---|
[52] | 452 |
|
---|
| 453 | return states
|
---|
| 454 |
|
---|
| 455 | def unregisterHotkeys(self):
|
---|
| 456 | """Unregister the previously registered hotkeys."""
|
---|
| 457 | self._writeU8(COMMAND_UNREGISTER_HOTKEYS)
|
---|
| 458 | self._flush()
|
---|
| 459 | self._checkResult()
|
---|
| 460 |
|
---|
[31] | 461 | def disconnect(self):
|
---|
| 462 | """Disconnect from X-Plane."""
|
---|
| 463 | if self._stream is not None:
|
---|
[56] | 464 | try:
|
---|
| 465 | self._stream.close()
|
---|
| 466 | finally:
|
---|
| 467 | self._stream = None
|
---|
[31] | 468 |
|
---|
[40] | 469 | def _checkResult(self, resultCode = None, parameter = None, multi = False):
|
---|
[31] | 470 | """Check the given result code.
|
---|
| 471 |
|
---|
| 472 | If it is None, it will be read first.
|
---|
| 473 |
|
---|
| 474 | If it is not RESULT_OK, a ProtocolException is thrown."""
|
---|
| 475 |
|
---|
| 476 | if resultCode is None:
|
---|
| 477 | resultCode = self._readU8()
|
---|
[40] | 478 | if multi and resultCode==RESULT_UNKNOWN_DATAREF:
|
---|
| 479 | parameter = self._readU32()
|
---|
| 480 |
|
---|
[31] | 481 | if resultCode!=RESULT_OK:
|
---|
[40] | 482 | raise ProtocolException(resultCode, parameter)
|
---|
[31] | 483 |
|
---|
| 484 | def _getSingle(self, name, type, length = None, offset = None):
|
---|
| 485 | """Get the single value of the given name and type."""
|
---|
| 486 | self._writeU8(COMMAND_GET_SINGLE)
|
---|
| 487 | self._writeString(name)
|
---|
| 488 | self._writeU8(type)
|
---|
| 489 | if length is not None and offset is not None:
|
---|
| 490 | self._writeS32(length)
|
---|
| 491 | self._writeS32(offset)
|
---|
| 492 |
|
---|
| 493 | self._flush()
|
---|
| 494 | self._checkResult()
|
---|
| 495 | return self._readValue(type)
|
---|
| 496 |
|
---|
| 497 | def _readValue(self, type):
|
---|
| 498 | """Read the value of the given type from the stream."""
|
---|
| 499 | if type==TYPE_INT:
|
---|
| 500 | return self._readS32()
|
---|
| 501 | elif type==TYPE_FLOAT:
|
---|
| 502 | return self._readFloat()
|
---|
| 503 | elif type==TYPE_DOUBLE:
|
---|
| 504 | return self._readDouble()
|
---|
| 505 | else:
|
---|
| 506 | length = self._readS32()
|
---|
| 507 | arr = None
|
---|
| 508 | elementSize = 4
|
---|
| 509 | if type==TYPE_FLOAT_ARRAY:
|
---|
| 510 | arr = array.array("f")
|
---|
| 511 | elif type==TYPE_INT_ARRAY:
|
---|
| 512 | arr = array.array("i")
|
---|
| 513 | elif type==TYPE_BYTE_ARRAY:
|
---|
| 514 | arr = array.array("B")
|
---|
| 515 | elementSize = 1
|
---|
| 516 | if arr is not None and length>0:
|
---|
| 517 | arr.fromstring(self._stream.read(length*elementSize))
|
---|
[35] | 518 | return None if arr is None else arr.tolist()
|
---|
[31] | 519 |
|
---|
[32] | 520 | def _setSingle(self, name, type, value, offset = None):
|
---|
| 521 | """Set the single value of the given name and type."""
|
---|
| 522 | self._writeU8(COMMAND_SET_SINGLE)
|
---|
| 523 | self._writeString(name)
|
---|
| 524 | self._writeU8(type)
|
---|
| 525 | if offset is not None:
|
---|
| 526 | self._writeS32(len(value))
|
---|
| 527 | self._writeS32(offset)
|
---|
| 528 |
|
---|
| 529 | self._writeValue(type, value)
|
---|
| 530 | self._flush()
|
---|
| 531 | self._checkResult()
|
---|
| 532 |
|
---|
| 533 | def _writeValue(self, type, value):
|
---|
| 534 | """Write a value of the given type."""
|
---|
| 535 | if type==TYPE_INT:
|
---|
| 536 | self._writeS32(int(value))
|
---|
| 537 | elif type==TYPE_FLOAT:
|
---|
| 538 | self._writeFloat(float(value))
|
---|
| 539 | elif type==TYPE_DOUBLE:
|
---|
| 540 | self._writeDouble(float(value))
|
---|
| 541 | else:
|
---|
| 542 | arr = None
|
---|
| 543 | if type==TYPE_FLOAT_ARRAY:
|
---|
| 544 | arr = array.array("f")
|
---|
| 545 | elif type==TYPE_INT_ARRAY:
|
---|
| 546 | arr = array.array("i")
|
---|
| 547 | elif type==TYPE_BYTE_ARRAY:
|
---|
| 548 | arr = array.array("B")
|
---|
| 549 | arr.fromlist(value)
|
---|
| 550 | self._stream.write(arr.tostring())
|
---|
| 551 |
|
---|
[31] | 552 | def _writeU8(self, x):
|
---|
| 553 | """Write the given value as an unsigned, 8-bit value."""
|
---|
| 554 | self._stream.write(struct.pack("B", x))
|
---|
| 555 |
|
---|
[52] | 556 | def _writeU16(self, x):
|
---|
| 557 | """Write the given value as an unsigned, 16-bit value."""
|
---|
| 558 | self._stream.write(struct.pack("H", x))
|
---|
| 559 |
|
---|
[31] | 560 | def _writeS32(self, x):
|
---|
| 561 | """Write the given value as a signed, 32-bit value."""
|
---|
| 562 | self._stream.write(struct.pack("i", x))
|
---|
| 563 |
|
---|
| 564 | def _writeU32(self, x):
|
---|
| 565 | """Write the given value as an unsigned, 32-bit value."""
|
---|
| 566 | self._stream.write(struct.pack("I", x))
|
---|
| 567 |
|
---|
| 568 | def _writeFloat(self, x):
|
---|
| 569 | """Write the given value as a single-precision floating point."""
|
---|
| 570 | self._stream.write(struct.pack("f", x))
|
---|
| 571 |
|
---|
| 572 | def _writeDouble(self, x):
|
---|
| 573 | """Write the given value as a double-precision floating point."""
|
---|
| 574 | self._stream.write(struct.pack("d", x))
|
---|
| 575 |
|
---|
| 576 | def _writeLength(self, length):
|
---|
| 577 | """Write the given value is a variable-length value into our stream."""
|
---|
| 578 | self._stream.write(self._packLength(length))
|
---|
| 579 |
|
---|
| 580 | def _writeString(self, str):
|
---|
| 581 | """Write the given string into the stream."""
|
---|
| 582 | self._stream.write(self._packString(str))
|
---|
| 583 |
|
---|
| 584 | def _flush(self):
|
---|
| 585 | """Flush our stream."""
|
---|
| 586 | self._stream.flush()
|
---|
| 587 |
|
---|
| 588 | def _readU8(self):
|
---|
| 589 | """Read an unsigned, 8-bit value from the stream."""
|
---|
| 590 | (value,) = struct.unpack("B", self._stream.read(1))
|
---|
| 591 | return value
|
---|
| 592 |
|
---|
| 593 | def _readS32(self):
|
---|
| 594 | """Read a signed, 32-bit value from the stream."""
|
---|
| 595 | (value,) = struct.unpack("i", self._stream.read(4))
|
---|
| 596 | return value
|
---|
| 597 |
|
---|
| 598 | def _readU32(self):
|
---|
| 599 | """Read an unsigned, 32-bit value from the stream."""
|
---|
| 600 | (value,) = struct.unpack("I", self._stream.read(4))
|
---|
| 601 | return value
|
---|
| 602 |
|
---|
| 603 | def _readFloat(self):
|
---|
| 604 | """Read a single-precision floating point value from the stream."""
|
---|
| 605 | (value,) = struct.unpack("f", self._stream.read(4))
|
---|
| 606 | return value
|
---|
| 607 |
|
---|
| 608 | def _readDouble(self):
|
---|
| 609 | """Read a double-precision floating point value from the stream."""
|
---|
| 610 | (value,) = struct.unpack("d", self._stream.read(8))
|
---|
| 611 | return value
|
---|
| 612 |
|
---|
| 613 | def _readLength(self):
|
---|
| 614 | """Read a variable-length value from our stream."""
|
---|
| 615 | length = 0
|
---|
| 616 | while True:
|
---|
| 617 | (x,) = struct.unpack("B", self._stream.read(1))
|
---|
| 618 | length <<= 7
|
---|
| 619 | length |= x&0x7f
|
---|
| 620 | if x&0x80==0:
|
---|
| 621 | return length
|
---|
| 622 |
|
---|
| 623 | def _readString(self):
|
---|
| 624 | """Read a string from our stream."""
|
---|
| 625 | length = self._readLength()
|
---|
| 626 | return self._stream.read(length)
|
---|
| 627 |
|
---|
| 628 | #-------------------------------------------------------------------------------
|
---|
[34] | 629 |
|
---|
| 630 | class MultiBuffer(object):
|
---|
| 631 | """Buffer for querying or setting multi-dataref values."""
|
---|
[66] | 632 |
|
---|
| 633 | ## @var _xplane
|
---|
| 634 | # the \ref XPlane object this buffer belongs to
|
---|
| 635 |
|
---|
| 636 | ## @var _registerCommand
|
---|
| 637 | # the command used to perform the registration of this buffer
|
---|
| 638 | # (\ref COMMAND_REGISTER_GET_MULTI or \ref COMMAND_REGISTER_SET_MULTI)
|
---|
| 639 |
|
---|
| 640 | ## @var _unregisterCommand
|
---|
| 641 | # the command used to perform the registration of this buffer
|
---|
| 642 | # (\ref COMMAND_UNREGISTER_GET_MULTI or \ref COMMAND_UNREGISTER_SET_MULTI)
|
---|
| 643 |
|
---|
| 644 | ## @var _dataRefs
|
---|
| 645 | # the datarefs belonging to the buffer
|
---|
| 646 |
|
---|
| 647 | ## @var _values
|
---|
| 648 | # the value of the datarefs before setting or after querying
|
---|
| 649 |
|
---|
| 650 | ## @var _registeredID
|
---|
| 651 | # the ID with which the buffer is registered in X-Plane
|
---|
| 652 |
|
---|
[34] | 653 | @staticmethod
|
---|
| 654 | def _getDefault(type, length):
|
---|
| 655 | """Get the default value for the given type."""
|
---|
| 656 | if type==TYPE_INT:
|
---|
| 657 | return 0
|
---|
| 658 | elif type==TYPE_FLOAT:
|
---|
| 659 | return float(0.0)
|
---|
| 660 | elif type==TYPE_DOUBLE:
|
---|
| 661 | return 0.0
|
---|
| 662 | elif length<=0:
|
---|
| 663 | return []
|
---|
| 664 | elif type==TYPE_FLOAT_ARRAY:
|
---|
| 665 | return [float(0.0)] * length
|
---|
| 666 | elif type==TYPE_INT_ARRAY or type==TYPE_BYTE_ARRAY:
|
---|
| 667 | return [0] * length
|
---|
| 668 |
|
---|
| 669 | def __init__(self, xplane, registerCommand, unregisterCommand):
|
---|
| 670 | """Construct the buffer for the given XPlane instance and with the
|
---|
| 671 | given register/unregister command values."""
|
---|
| 672 | self._xplane = xplane
|
---|
| 673 | self._registerCommand = registerCommand
|
---|
| 674 | self._unregisterCommand = unregisterCommand
|
---|
| 675 |
|
---|
| 676 | self._dataRefs = []
|
---|
| 677 | self._values = None
|
---|
| 678 |
|
---|
| 679 | self._registeredID = None
|
---|
| 680 |
|
---|
[36] | 681 | @property
|
---|
| 682 | def values(self):
|
---|
| 683 | """Query the values as a list."""
|
---|
| 684 | if self._values is None:
|
---|
| 685 | self.finalize()
|
---|
| 686 | return self._values
|
---|
| 687 |
|
---|
[34] | 688 | def addInt(self, name):
|
---|
| 689 | """Add an integer to the buffer with the given name
|
---|
| 690 |
|
---|
| 691 | Returns an ID (or index) of the dataref."""
|
---|
| 692 | return self._add(name, TYPE_INT)
|
---|
| 693 |
|
---|
| 694 | def addFloat(self, name):
|
---|
| 695 | """Add a float to the buffer with the given name
|
---|
| 696 |
|
---|
| 697 | Returns an ID (or index) of the dataref."""
|
---|
| 698 | return self._add(name, TYPE_FLOAT)
|
---|
| 699 |
|
---|
| 700 | def addDouble(self, name):
|
---|
| 701 | """Add a double to the buffer with the given name
|
---|
| 702 |
|
---|
| 703 | Returns an ID (or index) of the dataref."""
|
---|
| 704 | return self._add(name, TYPE_DOUBLE)
|
---|
| 705 |
|
---|
| 706 | def addFloatArray(self, name, length = -1, offset = 0):
|
---|
| 707 | """Add a floating point array to the buffer with the given name.
|
---|
| 708 |
|
---|
| 709 | Returns an ID (or index) of the dataref."""
|
---|
| 710 | return self._add(name, TYPE_FLOAT_ARRAY, length, offset)
|
---|
| 711 |
|
---|
| 712 | def addIntArray(self, name, length = -1, offset = 0):
|
---|
| 713 | """Add an integer array to the buffer with the given name.
|
---|
| 714 |
|
---|
| 715 | Returns an ID (or index) of the dataref."""
|
---|
| 716 | return self._add(name, TYPE_INT_ARRAY, length, offset)
|
---|
| 717 |
|
---|
| 718 | def addByteArray(self, name, length = -1, offset = 0):
|
---|
| 719 | """Add a byte array to the buffer with the given name.
|
---|
| 720 |
|
---|
| 721 | Returns an ID (or index) of the dataref."""
|
---|
| 722 | return self._add(name, TYPE_BYTE_ARRAY, length, offset)
|
---|
| 723 |
|
---|
| 724 | def finalize(self):
|
---|
| 725 | """Finalize the buffer, if not finalized yet.
|
---|
| 726 |
|
---|
| 727 | It initializes the array of values with some defaults.
|
---|
| 728 |
|
---|
| 729 | Returns whether there is any data in the buffer."""
|
---|
| 730 | if self._values is None:
|
---|
| 731 | self._values = [self._getDefault(type, length)
|
---|
| 732 | for (_, type, length, _) in self._dataRefs]
|
---|
| 733 | return self._values!=[]
|
---|
| 734 |
|
---|
| 735 | def register(self):
|
---|
| 736 | """Register the buffer in X-Plane."""
|
---|
| 737 | if self.finalize() and self._registeredID is None:
|
---|
| 738 | self._writeSpec(self._registerCommand)
|
---|
| 739 | self._registeredID = self._xplane._readU32()
|
---|
| 740 |
|
---|
| 741 | def unregister(self):
|
---|
| 742 | """Unregister the buffer from X-Plane."""
|
---|
| 743 | if self._registeredID is not None:
|
---|
| 744 | self._xplane._writeU8(self._unregisterCommand)
|
---|
| 745 | self._xplane._writeU32(self._registeredID)
|
---|
| 746 | self._xplane._flush()
|
---|
| 747 | self._xplane._checkResult()
|
---|
| 748 | self._registeredID = None
|
---|
| 749 |
|
---|
[56] | 750 | def unregisterSafely(self):
|
---|
| 751 | """Unregister the buffer from X-Plane, ignoring exceptions.
|
---|
| 752 |
|
---|
| 753 | Returns True if the unregistration succeeded, False otherwise.
|
---|
| 754 | """
|
---|
| 755 | try:
|
---|
| 756 | self.unregister()
|
---|
| 757 | return True
|
---|
| 758 | except:
|
---|
| 759 | return False
|
---|
| 760 | finally:
|
---|
| 761 | self._registeredID = None
|
---|
| 762 |
|
---|
[34] | 763 | def execute(self):
|
---|
| 764 | """Perform the querying or the setting of the values.
|
---|
| 765 |
|
---|
| 766 | It first checks if the buffer is finalized. If not, it will be
|
---|
| 767 | finalized. However, if it is not finalized but also registered, it will
|
---|
| 768 | first be unregistered and the re-registered after finalizing."""
|
---|
| 769 | if self._values is None and self._registeredID is not None:
|
---|
| 770 | self.unregister()
|
---|
| 771 | self.register()
|
---|
| 772 | else:
|
---|
| 773 | self.finalize()
|
---|
| 774 |
|
---|
| 775 | if self._registeredID is None:
|
---|
| 776 | self._executeUnregistered()
|
---|
| 777 | else:
|
---|
| 778 | self._executeRegistered()
|
---|
| 779 |
|
---|
| 780 | def getString(self, id):
|
---|
| 781 | """Get the value of the dataref with the given ID as a string.
|
---|
| 782 |
|
---|
| 783 | The dataref should be of type byte array."""
|
---|
| 784 | if self._dataRefs[id][1]!=TYPE_BYTE_ARRAY:
|
---|
| 785 | raise TypeError("xplra.MultiBuffer.getString: only byte arrays can be converted to strings")
|
---|
| 786 | if self._values is None:
|
---|
| 787 | self.finalize()
|
---|
| 788 | s = ""
|
---|
| 789 | for c in self._values[id]:
|
---|
| 790 | if c==0: break
|
---|
| 791 | s += chr(c)
|
---|
| 792 | return s
|
---|
| 793 |
|
---|
[56] | 794 | def _reregister(self):
|
---|
| 795 | """Re-register the buffer in X-Plane, if it has been registered earlier
|
---|
| 796 |
|
---|
| 797 | If it has not been registered, nothing is done. Otherwise the buffer
|
---|
| 798 | gets registered, and the old ID is forgotten. This function is meant to
|
---|
| 799 | be used by the XPlane object when it creates a new connection. If the
|
---|
| 800 | registration fails, the original ID is restored, so the _reregister()
|
---|
| 801 | could be called again
|
---|
| 802 | """
|
---|
| 803 | if self._registeredID is not None:
|
---|
| 804 | origRegisteredID = self._registeredID
|
---|
| 805 | try:
|
---|
| 806 | self._registeredID = None
|
---|
| 807 | self.register()
|
---|
| 808 | except:
|
---|
| 809 | self._registeredID = origRegisteredID
|
---|
| 810 | raise
|
---|
| 811 |
|
---|
[34] | 812 | def _add(self, name, type, length = None, offset = None):
|
---|
| 813 | """Add a scalar to the buffer with the given name and type"""
|
---|
| 814 | index = len(self._dataRefs)
|
---|
| 815 | self._values = None
|
---|
| 816 | self._dataRefs.append( (name, type, length, offset) )
|
---|
| 817 | return index
|
---|
| 818 |
|
---|
| 819 | def _writeSpec(self, command):
|
---|
| 820 | """Write the specification preceded by the given command and check for
|
---|
| 821 | the result.
|
---|
| 822 |
|
---|
| 823 | The specification is basically the list of the datarefs."""
|
---|
| 824 | self._xplane._writeU8(command)
|
---|
| 825 | self._xplane._writeU32(len(self._dataRefs))
|
---|
| 826 |
|
---|
| 827 | for (name, type, length, offset) in self._dataRefs:
|
---|
| 828 | self._xplane._writeString(name)
|
---|
| 829 | self._xplane._writeU8(type)
|
---|
| 830 | if length is not None and offset is not None:
|
---|
| 831 | self._xplane._writeS32(length)
|
---|
| 832 | self._xplane._writeS32(offset)
|
---|
| 833 |
|
---|
| 834 | self._xplane._flush()
|
---|
[40] | 835 | self._xplane._checkResult(multi = True)
|
---|
[34] | 836 |
|
---|
| 837 | def __len__(self):
|
---|
| 838 | """Get the number of value items in the buffer."""
|
---|
| 839 | if self._values is None:
|
---|
| 840 | self.finalize()
|
---|
| 841 | return len(self._values)
|
---|
| 842 |
|
---|
| 843 | def __getitem__(self, id):
|
---|
| 844 | """Get the item with the given ID."""
|
---|
| 845 | if self._values is None:
|
---|
| 846 | self.finalize()
|
---|
| 847 | return self._values[id]
|
---|
| 848 |
|
---|
| 849 | def __setitem__(self, id, value):
|
---|
| 850 | """Set the item with the given ID."""
|
---|
| 851 | if self._values is None:
|
---|
| 852 | self.finalize()
|
---|
| 853 | type = self._dataRefs[id][1]
|
---|
[35] | 854 | length = self._dataRefs[id][2]
|
---|
[34] | 855 | if type==TYPE_INT:
|
---|
| 856 | self._values[id] = int(value)
|
---|
[35] | 857 | elif type==TYPE_FLOAT or type==TYPE_DOUBLE:
|
---|
[34] | 858 | self._values[id] = float(value)
|
---|
| 859 | elif type==TYPE_FLOAT_ARRAY:
|
---|
[35] | 860 | if len(value)!=length:
|
---|
| 861 | raise ValueError("xplra.MultiBuffer: expected a list of length %d" % (length,))
|
---|
[34] | 862 | self._values[id] = [float(x) for x in value]
|
---|
| 863 | elif type==TYPE_INT_ARRAY:
|
---|
[35] | 864 | if len(value)!=length:
|
---|
| 865 | raise ValueError("xplra.MultiBuffer: expected a list of length %d" % (length,))
|
---|
[34] | 866 | self._values[id] = [int(x) for x in value]
|
---|
| 867 | elif type==TYPE_BYTE_ARRAY:
|
---|
[35] | 868 | if isinstance(value, str):
|
---|
| 869 | lst = [ord(x) for x in value[:length]]
|
---|
| 870 | if len(lst)<length:
|
---|
| 871 | lst += [0] * (length-len(lst))
|
---|
| 872 | self._values[id] = lst
|
---|
[34] | 873 | else:
|
---|
[35] | 874 | if len(value)!=length:
|
---|
| 875 | raise ValueError("xplra.MultiBuffer: expected a list of length %d" % (length,))
|
---|
[34] | 876 | self._values[id] = [int(x) for x in value]
|
---|
| 877 |
|
---|
| 878 | def __iter__(self):
|
---|
| 879 | """Get an iterator over the values of this buffer."""
|
---|
| 880 | if self._values is None:
|
---|
| 881 | self.finalize()
|
---|
| 882 | return iter(self._values)
|
---|
| 883 |
|
---|
| 884 |
|
---|
| 885 | #-------------------------------------------------------------------------------
|
---|
| 886 |
|
---|
| 887 | class MultiGetter(MultiBuffer):
|
---|
| 888 | """Multi-dataref buffer for querying."""
|
---|
| 889 | def __init__(self, xplane):
|
---|
| 890 | """Construct the getter."""
|
---|
| 891 | super(MultiGetter, self).__init__(xplane,
|
---|
| 892 | COMMAND_REGISTER_GET_MULTI,
|
---|
| 893 | COMMAND_UNREGISTER_GET_MULTI)
|
---|
| 894 |
|
---|
| 895 | def _executeRegistered(self):
|
---|
| 896 | """Execute the query if the buffer is registered."""
|
---|
| 897 | self._xplane._writeU8(COMMAND_EXECUTE_GET_MULTI)
|
---|
| 898 | self._xplane._writeU32(self._registeredID)
|
---|
| 899 | self._xplane._flush()
|
---|
| 900 |
|
---|
[40] | 901 | self._xplane._checkResult(multi = True)
|
---|
[34] | 902 |
|
---|
| 903 | self._readValues()
|
---|
| 904 |
|
---|
| 905 | def _executeUnregistered(self):
|
---|
| 906 | """Execute the query if the buffer is not registered."""
|
---|
| 907 | self._writeSpec(COMMAND_GET_MULTI)
|
---|
| 908 | self._readValues()
|
---|
| 909 |
|
---|
| 910 | def _readValues(self):
|
---|
| 911 | """Read the values into the values array."""
|
---|
| 912 | for i in range(0, len(self._dataRefs)):
|
---|
| 913 | self._values[i] = self._xplane._readValue(self._dataRefs[i][1])
|
---|
| 914 |
|
---|
| 915 | #-------------------------------------------------------------------------------
|
---|
[35] | 916 |
|
---|
| 917 | class MultiSetter(MultiBuffer):
|
---|
| 918 | """Multi-dataref buffer for setting."""
|
---|
| 919 | def __init__(self, xplane):
|
---|
| 920 | """Construct the getter."""
|
---|
| 921 | super(MultiSetter, self).__init__(xplane,
|
---|
| 922 | COMMAND_REGISTER_SET_MULTI,
|
---|
| 923 | COMMAND_UNREGISTER_SET_MULTI)
|
---|
| 924 |
|
---|
| 925 | def _executeRegistered(self):
|
---|
| 926 | """Execute the query if the buffer is registered."""
|
---|
| 927 | self._xplane._writeU8(COMMAND_EXECUTE_SET_MULTI)
|
---|
| 928 | self._xplane._writeU32(self._registeredID)
|
---|
| 929 | for i in range(0, len(self._dataRefs)):
|
---|
| 930 | self._xplane._writeValue(self._dataRefs[i][1], self._values[i])
|
---|
| 931 | self._xplane._flush()
|
---|
| 932 |
|
---|
[40] | 933 | self._xplane._checkResult(multi = True)
|
---|
[35] | 934 |
|
---|
| 935 | def _executeUnregistered(self):
|
---|
| 936 | """Execute the query if the buffer is not registered."""
|
---|
| 937 | self._xplane._writeU8(COMMAND_SET_MULTI)
|
---|
| 938 |
|
---|
| 939 | numDataRefs = len(self._dataRefs)
|
---|
| 940 | self._xplane._writeU32(numDataRefs)
|
---|
| 941 |
|
---|
| 942 | for i in range(0, numDataRefs):
|
---|
| 943 | (name, type, length, offset) = self._dataRefs[i]
|
---|
| 944 | value = self._values[i]
|
---|
| 945 |
|
---|
| 946 | self._xplane._writeString(name)
|
---|
[37] | 947 | self._xplane._writeU8(type)
|
---|
[35] | 948 | if length is not None and offset is not None:
|
---|
| 949 | self._xplane._writeS32(len(value))
|
---|
| 950 | self._xplane._writeS32(offset)
|
---|
| 951 | self._xplane._writeValue(type, value)
|
---|
| 952 |
|
---|
| 953 | self._xplane._flush()
|
---|
[40] | 954 | self._xplane._checkResult(multi = True)
|
---|
[35] | 955 |
|
---|
| 956 | #-------------------------------------------------------------------------------
|
---|