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Multiple windows - destroyWindow hangs

asked 2018-05-21 23:12:03 -0500

djtommye gravatar image

I have a MFC C++ slideshow program that I've written, which uses a thread to display images on a secondary monitor.

I just added code to also show the same image, scaled down, as a thumbnail on the primary monitor. However, when I call destroyWindow(), the call hangs.

The code is as follows:

    destroyWindow(SCREEN_TITLE);
    waitKey(1);
    destroyWindow(THUMBNAIL_TITLE);
    waitKey(1);

I added the waitKey after reading that suggestion in another forum topic, but the second call to destroyWindow never returns??

Also - the second window has an aero cursor, while the first window has cross hairs.

Any help would be appreciated!

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all opencv gui functions have to stay in the main thread.

and waitKey() only has an effect, IF there is any opencv gui window

berak gravatar imageberak ( 2018-05-22 03:50:42 -0500 )edit

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answered 2018-05-22 23:13:46 -0500

djtommye gravatar image

Thank you, berak. That fixed it. I posted a custom message to the parent process to display the image and everything is much better now. THANK YOU!

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Asked: 2018-05-21 23:12:03 -0500

Seen: 107 times

Last updated: May 21 '18