function can discard all characters from the output or input buffer of a
specified communications resource. It can also terminate pending read or write
operations on the resource.
| HANDLE hFile,
||// handle of communications resource
| DWORD dwFlags
||// action to perform
Identifies the communications resource. The CreateFile
function returns this handle.
Specifies the action to take. This parameter can be a combination of the
||Terminates all outstanding write operations and returns immediately, even if
the write operations have not been completed.
||Terminates all outstanding read operations and returns immediately, even if
the read operations have not been completed.
||Clears the output buffer (if the device driver has one).
||Clears the input buffer (if the device driver has one).
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error
information, call GetLastError
If a thread uses PurgeComm
to flush an output buffer, the deleted characters are not transmitted. To
empty the output buffer while ensuring that the contents are transmitted, call the FlushFileBuffers
function (a synchronous operation). Note, however, that FlushFileBuffers
is subject to flow control but not to write time-outs, and it will not return
until all pending write operations have been transmitted.
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