ICM_DRAW_QUERY

The ICM_DRAW_QUERY message queries a rendering driver to determine if it can render data in a specific format. You can send this message explicitly or by using the ICDrawQuery macro.

ICM_DRAW_QUERY 
wParam = (DWORD) (LPVOID) lpbiInput; 
lParam = 0; 
 

Parameters

lpbiInput

Address of a BITMAPINFO structure containing the input format.

Return Values

Returns ICERR_OK if the driver can render data in the specified format or ICERR_BADFORMAT otherwise.

Remarks

This message differs from the ICM_DRAW_BEGIN message in that it queries the driver in a general sense. ICM_DRAW_BEGIN determines if the driver can draw the data using the specified format under specific conditions, such as stretching the image.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Windows 95/98: Requires Windows 95 or later.
  Header: Declared in Vfw.h.

See Also

Video Compression Manager Overview, Video Compression Messages, BITMAPINFO, ICDrawQuery, ICM_DRAW_BEGIN