How to create a DirectShow Filter and the main concern is how to select the window to follow. I want to do something like google plus hangout uses to select the window to show in screen share.
Thanks to help :)
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Would you like to output video through `DirectShow` to selected windows? – Roman R. Apr 27 '12 at 17:20
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I want to capture the selected window. – diogopalhais Apr 27 '12 at 21:14
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You don't need DirectShow to capture window image. With a DC-to-DC BitBlt the picture is already yours. See:
- Writing to the screen from the screen using BitBlt
- How to speed up BitBlt to capture screen with aero?
- Store a screen capture (Bitblt) in a memory buffer to send over IdTCPClient
If you want to wrap this into a DirectShow filter, Windows SDK sample Push Source is doing a close thing (CPushSourceDesktop).
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thanks a lot for the links i will study them but how to lock a window by the hwnd ? can you help me ? – diogopalhais Apr 28 '12 at 17:14
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What do you mean "lock"? If you have `HWND` then you can get its device context using `GetDC` or `GetWindowDC` and copy from there. – Roman R. Apr 28 '12 at 17:59
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I been working with what @Roman says and i modified this [project](http://dl.dropbox.com/u/22121737/CaptureScreen.rar) but now i want to use this as a directshow filter to capture as a video. how can i do this? – diogopalhais May 01 '12 at 16:17