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WM_CAP_GET_VIDEOFORMAT
The WM_CAP_GET_VIDEOFORMAT message retrieves a copy of the video format in use
or the size required for the video format. You can send this message
explicitly or by using the capGetVideoFormat and capGetVideoFormatSize macros.
WM_CAP_GET_VIDEOFORMAT
wParam = (WPARAM) (wSize);
lParam = (LPARAM) (LPVOID) (psVideoFormat);
Parameters
wSize
Size, in bytes, of the structure referenced by s.
psVideoFormat
Address of a BITMAPINFO structure. You can also specify NULL to retrieve the number of bytes needed
by BITMAPINFO.
Return Values
Returns the size, in bytes, of the video format or zero if the capture window
is not connected to a capture driver. For video formats that require a palette,
the current palette is also returned.
Remarks
Because compressed video formats vary in size requirements applications must
first retrieve the size, then allocate memory, and finally request the video
format data.
See Also
BITMAPINFO, capGetVideoFormat, capGetVideoFormatSize
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