#Stretchblt vs copyimage code

I guess that there is some flag to be set differently. So this suggests to me that the problem is with the StretchBlt(.) function in the new version. If the StretchBlt(.) function is not called in the old version, the bitmap is not displayed. Unfortunately, I learned that in the old version, the dimensions reported don'tĬhange either, even though the old version displays the bitmap. I was hoping this might be a clue that this function was not working. The new version reports bitmap dimensions identical before and after the StretchBlt(.) call. However, after the StretchBlt(.) call the new version does not display Specifically, the size of the bitmap to be displayed and the size of the destination rectangle are reported by TRACE.

#Stretchblt vs copyimage code

The 2013 version, which has identical code (except with updates for newer string types) APPEARS to function ok,Īs shown by TRACE statements, up to the call of StretchBlt(.). The old 2003 program works fine for displaying bitmaps. Has two dialog windows, one for introducing selections, the other for displaying images.

The old system's code is essentially that of Davis Chapman, Teach yourself Visual C ++.net (SAMS 2001). The new system is Windows 7, VS2013 C++ MFC. The old system is Windows XP, VS2003 C++ MFC.