Same problem i faced yesterday and fixed it. In my case i was creating a DISPLAY DC and one Compatible DC and one Bitmap memory through CreateDIBSection API call. hdc = CreateDC("DISPLAY",NULL,NULL,NULL); Bitmap = CreateDIBSection(hdc, pBMI, DIB_RGB_COLORS, (void**)&m_pVideoBits, 0, 0); HDC hSrcDC = CreateCompatibleDC(hdc); SelectObject(hSrcDC, m_hViewfinderBitmap); while Deleting the Bitmap and DC you should follow the following way DeleteDC(hSrcDC); DeleteObject(Bitmap); DeleteDC(hdc); If your code also have some this kind of thing then please take care that, you should not clean a bitmap untill it is attached to the DC Hope i could help you some way. Regards Anil Kumar

nChar is a UINT. conversing from int to char is implicit ( it happens all by itself ), but UINT is a completely different type. Try pDoc->StringData += (char)nChar;, that should do it ( or something similar to that, in any case ). If you pass FALSE to your Invalidate, it won't call WM_ERASEBKGND, which will eliminate flicker. You realise that this code will not allow for the user to edit the string, but just to make it longer ? Christian Graus - Microsoft MVP - C++

when u refresh screen , u must reinsert digital gates. Or u can store digital gates in bitmap.

Yes it is a member of the View Class and just want to tell you that our View Class is being change to ScrollView From: Guilbert:)

Sorry what are the requirements i need to do before using this m_Bitmap.RedrawWindow(); Should i declare CDC m_Bitmap or CBitmap m_Bitmap?:)

Then why are you asking in the managed C++ forum ? :-) Christian I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

I thik you should decide wich way works the best for you. Anyway, I would choose creating projects individually. --Nikola--