CAMThread.CheckRequest method

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The CheckRequest method checks if there is a request, without blocking.

Syntax

BOOL CheckRequest(
   DWORD *pParam
);

Parameters

pParam

Pointer to a variable that receives the value passed in the last call to the CAMThread::CallWorker method.

Return value

Returns TRUE if there is a pending request, or FALSE otherwise.

Remarks

This method is a non-blocking version of the CAMThread::GetRequest method.

If another thread is waiting on a call to CallWorker, this method retrieves the request parameter and returns TRUE. Otherwise, it returns FALSE. If the method returns TRUE, call the CAMThread::Reply method to release the requesting thread.

Requirements

See also

CAMThread Class