Flushes the buffers of the specified COM device and causes all buffered data to be written to the device.

BOOLEAN FlushCommBuffers(
  COMMHANDLE hComm  // handle to device
);

Parameters

hComm

[in] Handle to an open device.
This function only flushes the transmit buffer.

Return Values

Non-zero

Success.

0 (zero)

Failure. To determine the status, call GetLastRtError.

Status

E_DISCONNECTED

COMM channel is closed.

Remarks

Note that this function is subject to flow control but not to write time-outs, and it does not return until all pending write operations are transmitted.

Requirements