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silicondale · Posted: Fri Dec 09, 2022 2:57 pm Post subject: DISPLAY_DIB_BLOCK@ and mouse

I have a simple program that reads and displays an image file using DISPLAY_DIB_BLOCK@. It works just fine.

I now want to use the mouse to get a few pixel positions in the image, but seem to be caught in a catch-22. If I call clearwin_info@ to get the mouse flags and the x and y coordinates before the widow is closed, I don't see the image or the mouse cursor. If I close the image window first, then I can't get the mouse position and the program hangs.

PaulLaidler · Posted: Fri Dec 09, 2022 4:14 pm Post subject:

Normally you would call clearwin_info@ from a callback function, in this case it would be attached to %gr using %^gr

integer,external::cbfunc

i=winio@('%^gr%lw&',nx1,ny1,cbfunc,kontrol)

silicondale · Posted: Fri Dec 09, 2022 4:46 pm Post subject:

Many thanks, Paul. Yes, something stirs in my memory. I did this once before. This is the problem when coding only intermittently over a period of many years! I shall give that a try.
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