HasOverlappedIoCompleted

The HasOverlappedIoCompleted macro provides a high performance test operation that can be used to poll for the completion of an outstanding I/O operation.

BOOL HasOverlappedIoCompleted(
  LPOVERLAPPED lpOverlapped
);

Parameters

lpOverlapped

Pointer to an OVERLAPPED structure that was specified when the overlapped I/O operation was started.

Return Values

Returns TRUE if the I/O operation has completed, and FALSE otherwise.

Remarks

To cancel all pending asynchronous I/O operations, use the CancelIo function. This function only cancels operations issued by the calling thread for the specified file handle. I/O operations that are canceled complete with the error ERROR_OPERATION_ABORTED.

To get more details about a completed I/O operation, call the GetOverlappedResult or GetQueuedCompletionStatus function.

Requirements

  Windows NT/2000: Requires Windows NT 4.0 or later.
  Windows 95/98: Requires Windows 98.
  Header: Declared in Winbase.h; include Windows.h.

See Also

Synchronization Overview, Synchronization Macros, CancelIo, ConnectNamedPipe, DeviceIoControl, OVERLAPPED, ReadFile, TransactNamedPipe, WaitCommEvent, WriteFile