def write(self, data):
"""Output the given string over the serial port."""
if not self.hComPort: raise portNotOpenError
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlappedWrite.hEvent)
n = win32.DWORD()
err = win32.WriteFile(self.hComPort, data, len(data),
ctypes.byref(n), self._overlappedWrite)
if not err and win32.GetLastError() != win32.ERROR_IO_PENDING:
raise SerialException("WriteFile failed (%r)" %
ctypes.WinError())
if self._writeTimeout != 0: # if blocking (None) or w/ write timeout (>0)
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlappedWrite.hEvent, win32.INFINITE)
err = win32.GetOverlappedResult(self.hComPort,
self._overlappedWrite,
ctypes.byref(n), True)
if n.value != len(data):
raise writeTimeoutError
return n.value
else:
return 0
def write(self, data):
"""Output the given byte string over the serial port."""
if not self.is_open:
raise portNotOpenError
#~ if not isinstance(data, (bytes, bytearray)):
#~ raise TypeError('expected %s or bytearray, got %s' % (bytes, type(data)))
# convert data (needed in case of memoryview instance: Py 3.1 io lib), ctypes doesn't like memoryview
data = to_bytes(data)
if data:
#~ win32event.ResetEvent(self._overlapped_write.hEvent)
n = win32.DWORD()
success = win32.WriteFile(self._port_handle, data, len(data),
ctypes.byref(n), self._overlapped_write)
if self._write_timeout != 0: # if blocking (None) or w/ write timeout (>0)
if not success and win32.GetLastError() not in (
win32.ERROR_SUCCESS, win32.ERROR_IO_PENDING):
raise SerialException("WriteFile failed ({!r})".format(
ctypes.WinError()))
# Wait for the write to complete.
#~ win32.WaitForSingleObject(self._overlapped_write.hEvent, win32.INFINITE)
win32.GetOverlappedResult(self._port_handle,
self._overlapped_write,
ctypes.byref(n), True)
if win32.GetLastError() == win32.ERROR_OPERATION_ABORTED:
return n.value # canceled IO is no error
if n.value != len(data):
raise writeTimeoutError
return n.value
else:
errorcode = win32.ERROR_SUCCESS if success else win32.GetLastError(
)
if errorcode in (win32.ERROR_INVALID_USER_BUFFER,
win32.ERROR_NOT_ENOUGH_MEMORY,
win32.ERROR_OPERATION_ABORTED):
return 0
elif errorcode in (win32.ERROR_SUCCESS,
win32.ERROR_IO_PENDING):
# no info on true length provided by OS function in async mode
return len(data)
else:
raise SerialException("WriteFile failed ({!r})".format(
ctypes.WinError()))
else:
return 0