CAPSTATUSCALLBACKA callback function (vfw.h)
The capStatusCallback function is the status callback function used with video capture. The name capStatusCallback is a placeholder for the application-supplied function name.
To set the callback, send the WM_CAP_SET_CALLBACK_STATUS message to the capture window or call the capSetCallbackOnStatus macro.
Syntax
CAPSTATUSCALLBACKA Capstatuscallbacka;
LRESULT Capstatuscallbacka(
HWND hWnd,
int nID,
LPCSTR lpsz
)
{...}
Parameters
hWnd
Handle to the capture window associated with the callback function.
nID
Message identification number.
lpsz
Pointer to a textual description of the returned status.
Return value
None
Remarks
During capture operations, the first message sent to the callback function is always IDS_CAP_BEGIN and the last is always IDS_CAP_END. A message identifier of zero indicates a new operation is starting and the callback function should clear the current status.
Note
The vfw.h header defines CAPSTATUSCALLBACK as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | vfw.h |