// When you don't want the ProcessId, use this overload and pass IntPtr.Zero for the second parameter
public uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr ProcessId)
{
return(PInvoker.GetWindowThreadProcessId(hWnd, ProcessId));
}
public uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId)
{
return(PInvoker.GetWindowThreadProcessId(hWnd, out lpdwProcessId));
}