创建DirectShow筛选器以选择HWND

Question

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 :)

Answer 1

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 ).