Windows desktop applications
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The WM_CAP_DLG_VIDEOSOURCE message displays a dialog box in which the user can control the video source. The Video Source dialog box might contain controls that select input sources; alter the hue, contrast, brightness of the image; and modify the video quality before digitizing the images into the frame buffer. You can send this message explicitly or by using the capDlgVideoSource macro.

wParam = (WPARAM) 0; 
lParam = 0L; 

Return Value

Returns TRUE if successful or FALSE otherwise.


The Video Source dialog box is unique for each capture driver. Some capture drivers might not support a Video Source dialog box. Applications can determine if the capture driver supports this message by checking the fHasDlgVideoSource member of the CAPDRIVERCAPS structure.


Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]



See also

Video Capture
Video Capture Messages



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