Hi K, I finally passed a MyView pointer to CDialog through constructor. Thus, I can access MyView member functions from CDialog. However, when I clicked OK on the Dialog, the program crashed. My guess is that I don't know how to delete the *pView that I passed to Dialog. I delete it in the contructor Dialog destructor). Any thought? By the way, it is a Modal dialog. Thanks,

Looks OK to me, although I'd set up the BitmapInfo record outside the paint processing. If ImX, ImY change between calls you can set just them. This would get that nasty for loop out of there! Anyhow, back to the flicker - the other possibility is that your WindowClass (that's class as in WNDCLASSEX) has a background brush defined. In this case I seem to recall that BeginPaint will erase the background without raising a WM_ERASEBKGND message.

An alternative is to pump the message queue every n iterations of the loop. There is no need to create a worker thread. Tim Smith I'm going to patent thought. I have yet to see any prior art.

See SetBitmapBits or SetDIBits.  onwards and upwards...