winapi - Bitmap not being painted in Win32 C++ -


i have window using win32 , in message handler have case wm_paint, bitmap drawn in window. on running bitmap not drawn, there missing? need manually send wm_paint message?

here code have: http://pastebin.com/bi48lb0u

and wm_paint case:

case wm_paint:     hdc = beginpaint(hwnd, &ps);     bmp = loadbitmap(hinst, l"c:\\example.bmp");     memdcexercising = createcompatibledc(hdc);     selectobject(memdcexercising, bmp);     bitblt(hdc, 100, 100, 500, 500, memdcexercising, 0, 0, srccopy);     deletedc(memdcexercising);     deleteobject(bmp);     endpaint(hwnd, &ps);     break;

your bitmap doesn't show, because call loadbitmap returns null, due invalid lpbitmapname argument. documentation loadbitmap:

lpbitmapname [in]: pointer null-terminated string contains name of bitmap resource loaded. alternatively, parameter can consist of resource identifier in low-order word , 0 in high-order word. makeintresource macro can used create value.

in other words: loadbitmap can load bitmaps resources of type rt_bitmap (or predefined bitmaps provided system). if need load bitmap disk, use loadimage instead.

if need load image data other plain bitmap files, consider using windows imaging component.


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