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WM_CAP_GET_VIDEOFORMAT message

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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 bys.

psVideoFormat

Pointer to a BITMAPINFO structure. You can also specify NULL to retrieve the number of bytes needed.

Return Value

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.

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