how to call windows paint event from child thread

If I am wrong then please correct me as I am new in this. I have one thread which display image captured from webcam on a windows created using CreateWindowEx() function. Now when i execute my program I can see that my paint code (in WindowProc()) in never reached (called InvalidateRec开发者_开发技巧t() from child thread to redraw), checked using breakpoint.

Actually frame capture and display is being done in thread and I think because its in child thread and Window is in Main thread that is why its not able to call paint event.

Can you help me on this

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Calling InvalidateRect() from a child thread should make your window redraw. However WM_PAINT is a low priority message, so it is possible that the window doesn't get redrawn if there is too much other activity. Have you tried putting a Sleep() into you processing thread to give the painting a chance to get done?