VC + + in-memory drawing

Draw in a memory bitmap and display it. The code is as follows:

HDC HDC=GETDC (HWND);    Rect rect;    GetClientRect (Hwnd,&rect);  int cxclient = Rect.right;    int cyclient = Rect.bottom;    Create a corresponding memory for the display device HDC Hdcmem = CreateCompatibleDC (NULL);    Create bitmap Hbitmap hbitmap = CreateCompatibleBitmap (hdc,cxclient,cyclient);    Binds the memory handle and the bitmap handle SelectObject (HDCMEM,HBITMAP);  Drawing FillRect (Hdcmem,&rect,null);    Rectangle (hdcmem,20,20,100,100);    Display to the window BitBlt (hdc,0,0,cxclient,cyclient,hdcmem,0,0,srccopy);  DeleteObject (HDCMEM);  DeleteObject (HBITMAP); ReleaseDC (HWND,HDC);

To create multiple memory bitmaps, you can call the CREATECOMPATIBLEDC and CreateCompatibleBitmap functions multiple times.

VC + + in-memory drawing