CAPERRORCALLBACKW callback function (vfw.h)
The capErrorCallback function is the error callback function used with video capture. The name capErrorCallback is a placeholder for the application-supplied function name.
To set the callback, send the WM_CAP_SET_CALLBACK_ERROR message to the capture window or call the capSetCallbackOnError macro.
Syntax
CAPERRORCALLBACKW Caperrorcallbackw;
LRESULT Caperrorcallbackw(
HWND hWnd,
int nID,
LPCWSTR lpsz
)
{...}
Parameters
hWnd
Handle to the capture window associated with the callback function.
nID
Error identification number.
lpsz
Pointer to a textual description of the returned error.
Return value
None
Remarks
A message identifier of zero indicates a new operation is starting and the callback function should clear the current error.
Note
The vfw.h header defines CAPERRORCALLBACK 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 |