capGetVideoFormatSize macro (vfw.h)
The capGetVideoFormatSize macro retrieves the size required for the video format. You can use this macro or explicitly call the WM_CAP_GET_VIDEOFORMAT message.
Syntax
void capGetVideoFormatSize(
hwnd
);
Parameters
hwnd
Handle to a capture window.
Return value
None
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.
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 |