drawing under icons on desktop

Question

I wrote a program who paints widget on desktop wallpaper, under desktop icons, and all was good. But I reveal a strange bug - my program was not works on some other computers - they displays the same desktop without widget after start. So, have anybody any expirience, some knowledge in this area? Please, help me! :) (I can't find any computers near, where widget not works, in my computer all works well. I wrote a lot of test programs, whose tries draw anything on desktop with rather methods, but test displays nothing too in my friends computers.) Drawing method: I wrote a dll, who finds desktop window (progman->child->child )) and creates a hook and install own window procedure for desktop. In window procedure i hook WM_ERASEBKGND: ``` case WM_ERASEBKGND: HDC hdc = (HDC)wparam; PaintDesktop(hdc); WidgetPaint(hdc); return 1; ``` // I skip in this code getting and setting clipping areas for fast drawing. (I tried all combinations with clipping and without clipping) And in tests I also t…

Accepted Answer

I solved it! It's simple was a 64-bit machines) So I compile my code for 64-bit and widget start work pretty good!

And, also -

```
PaintDesktop(hdc);
```

will produce very bright wallpaper in Windows7 (and Vista) with Aero. (User's wallpaper comes brighten). Must be

```
CallWindowProc(OldWndProc, WM_ERASEBKGND, wparam, lparam);
```

Cause of this - Aero treats PaintDesktop() as usual paint (over virtual screen wallpaper, that is the same as on desktop) with color summation.

Regards! :)

drawing under icons on desktop

Solution

Problem