capGetVideoFormatSize
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.
DWORD capGetVideoFormatSize(
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hwnd |
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); |
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Parameters
hwnd
Handle of a
capture window.
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