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Now, I found that after running for about 100s, the GetDC() returns 0 too;

p.s. the last line is pThis->ReleaseDC(pDC) instead of pThis->ReleaseDC()

Thank you for your attention, I met this problem in my timerproc function.

I need to change the color of the pen according to a changing value, so I need to createpen in this timerproc. After...