Re: wimp theme

["Brian J. Tarricone" <bjt23 cornell edu>]

Todd Fisher wrote:
[snip]

> I think the problem is in
> static HTHEME
> xp_theme_get_handle_by_class (XpThemeClass klazz)
> {
>  if (!open_themes[klazz] && open_theme_data_func)
>    {
>      open_themes[klazz] = open_theme_data_func(NULL, 
> class_descriptors[klazz]);
>    }
>  return open_themes[klazz];
> }
>
> I think the NULL why there is trouble.  I'm compiling with msvc and 
> using buffer over run check /GS
> and after calling that function 2 things happen. the first time it 
> returns NULL.
> the second time it returns a mangled pointer and the stack is trashed.
>
> Also, doing some invesitegation i could not find any examples that 
> called that function passing NULL.
> It is even some what documented as requiring a non-null pointer as it 
> says:
>  
>     "[in] Handle of the window for which theme data is required."
>
> I'm very new to this code though and to the interworkings of a theme 
> engine, so it is not clear to me how to go about
> getting that hwnd.  Any pointers would be great, as well as 
> suggestions on where to focus my energies :-)

would just any old HWND do?  if you don't need to know the HWND of the 
window to which you're going to apply the style, you can probably just 
use GDK_ROOT_WINDOW(), which returns HWND_DESKTOP on win32.  if the root 
window doesn't work, perhaps you can create a dummy GtkWindow and use 
GDK_WINDOW_HWND(GTK_WIDGET(gtk_window)->window).  i'm not at all 
familiar with the win32 theming API, so this may not work, but it's 
something to try.

   -brian