case WM_PAINT:{HBITMAP hbm;BITMAP bminfo;hbm = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_BITMAP1));GetObject(hbm, sizeof(bminfo), &bminfo);PAINTSTRUCT ps;HDC dc = BeginPaint(hwnd, &ps);HDC memdc = CreateCompatibleDC(dc);SelectObject(memdc, hbm);BitBlt(dc,0,0,bminfo.bmWidth,bminfo.bmHeight,memdc,0,0,SRCCOPY);DeleteDC(memdc);EndPaint(hwnd, &ps);break;}

　　https://www.cnblogs.com/gakusei/articles/1585212.html