IntPtr _w, _wDesk; //not wnd because then TypeLoadException
public int IsShellWindow(wnd w)
{
if (w.Is0)
{
return(0);
}
wnd wDesk = getwnd.shellWindow; //fast
if (w == wDesk)
{
return(1); //Progman. Other window (WorkerW) may be active when desktop active.
}
//cache because GetWindowThreadProcessId quite slow
if (w.Handle != _w)
{
_w = w.Handle; _tidW = w.GetThreadProcessId(out _pidW);
}
if (wDesk.Handle != _wDesk)
{
_wDesk = wDesk.Handle; _tidD = wDesk.GetThreadProcessId(out _pidD);
}
if (_tidW == _tidD)
{
return(1);
}
if (_pidW == _pidD)
{
return(2);
}
return(0);
}