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capGetVideoFormatSize macro

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


DWORD capGetVideoFormatSize(
   hwnd
);

Parameters

hwnd

Handle to a capture window.

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

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 Macros

 

 

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