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WM_CAP_SET_CALLBACK_STATUS message

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The WM_CAP_SET_CALLBACK_STATUS message sets a status callback function in the application. AVICap calls this procedure whenever the capture window status changes. You can send this message explicitly or by using the capSetCallbackOnStatus macro.

WM_CAP_SET_CALLBACK_STATUS 
wParam = (WPARAM) 0; 
lParam = (LPARAM) (LPVOID) (fpProc);

Parameters

fpProc

Pointer to the status callback function, of type capStatusCallback. Specify NULL for this parameter to disable a previously installed status callback function.

Return Value

Returns TRUE if successful or FALSE if streaming capture or a single-frame capture session is in progress.

Remarks

Applications can optionally set a status callback function. If set, AVICap calls this procedure in the following situations:

  • A capture session is completed.
  • A capture driver successfully connected to a capture window.
  • An optimal palette is created.
  • The number of captured frames is reported.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Vfw.h

See also

Video Capture

Video Capture Messages