Bug in native user32

Filip Navara xnavara at volny.cz
Mon Jul 25 16:02:37 CDT 2005

Jacek Caban wrote:

> Hello.
> Fixing MSHTML tests I found a bug in Windows.
> In tests I passed const WNDCLASSEX, to RegisterClassEx
> what should work as its declaration is:
> ATOM WINAPI RegisterClassExW(const WNDCLASSEXW *);
> Changing passed WNDCLASS to nonconst makes it
> works. I wrote small tests (attached) showing that if hInstance
> of WNDCLASSEX is NULL, RegisterClassEx sets it to
> GetModuleHandle(NULL). It, of course, couses segmentation
> fault in case CMASSWNDEX is const. This problem seams
> to happen on XP, NT 4, 2k and 2k3. So the question is if
> we should clone this bug? Some applications may expect
> it, but other may crash. They will crash on Windows anyway...
> Or we should mark test as todo_wine and change it
> if we found application that depend on it?
> Thanks,
>    Jacek 

Maybe it's just me, but I thought this is well-known "feature" of the 
API. It's implemented in ReactOS for quite some time. *g*

- Filip

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