Re: user32: Implement GetWindowModuleFileName with tests (try 2)

[Dmitry Timoshkov]

"Alexandre Julliard"  wrote:
> "Maarten Lankhorst"  writes:
> > @@ -3121,9 +3133,21 @@ UINT WINAPI GetWindowModuleFileNameA( HWND hwnd, LPSTR lpszFileName, UINT cchFil
> >   */
> >  UINT WINAPI GetWindowModuleFileNameW( HWND hwnd, LPWSTR lpszFileName, UINT cchFileNameMax)
> >  {
> > - FIXME("GetWindowModuleFileNameW(hwnd %p, lpszFileName %p, cchFileNameMax %u) stub!\n",
> > -
> >      hwnd, lpszFileName, cchFileNameMax);
> > - return 0;
> > - HINSTANCE hInst;
> > - UINT ret;
> > - TRACE("hwnd %p, lpszFileName %p, cchFileNameMax %u\n", hwnd, lpszFileName, cchFileNameMax);
> > -
> > - hInst = (HINSTANCE)GetWindowLongPtrW(hwnd, GWLP_HINSTANCE);
> > - if (!hInst)
> > - {
> > -
> >    if (hwnd == GetDesktopWindow() || !IsWindow(hwnd))
> > -
> >        return 0;
> > -
> >    hInst = GetModuleHandleW(0);
> > - }
> > -
> > - ret = GetModuleFileNameW(hInst, lpszFileName, cchFileNameMax);
> > - TRACE("--> %d %s\n", ret, debugstr_wn(lpszFileName, ret));
> > - return ret;
>
> This won't work across processes.

Looks like GetWindowModuleFileName is not supposed to work for other
process windows, at least in the following snippet both GetWindowLongPtr
and GetWindowModuleFileName return 0 but don't change the last error value
under XP although FindWindow returns a valid window handle:

hwnd = FindWindow("Shell_TrayWnd", NULL);
SetLastError(0xdeadbeef);
ret = GetWindowModuleFileNameA(hwnd, buf, sizeof(buf));
printf("hwnd %p, ret %u, buf "%s", error %u\n", hwnd, ret, buf, GetLastError());

SetLastError(0xdeadbeef);
hinst = (HINSTANCE)GetWindowLongPtr(hwnd, GWLP_HINSTANCE);
printf("hwnd %p, hinst %u, error %u\n", hwnd, ret, GetLastError());

GetWindowLong(hwnd, GWL_STYLE) returns a valid style. Both APIs behave the same
way for the desktop window.

So the above implementation of GetWindowModuleFileName looks correct except
a special case for the desktop window (GetWindowLong() should be fixed instead).