public static WindowsHwndSource FromHwnd(IntPtr hwnd)
{
const int GWLP_WNDPROC = -4;
uint tid = NativeMethods.GetWindowThreadProcessId(hwnd, IntPtr.Zero);
if (tid == 0)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
var source = new WindowsHwndSource(hwnd);
source.hWndProcHook = NativeMethods.SetWindowLongPtr(hwnd, GWLP_WNDPROC, Marshal.GetFunctionPointerForDelegate(source.fnWndProcHook));
if (source.hWndProcHook == IntPtr.Zero)
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
return(source);
}
private static void TryAddGlobalHook(Window window)
{
if (window == null)
{
return;
}
IntPtr hwnd = window.PlatformImpl == null ? MainWindow.PlatformImpl.Handle.Handle : window.PlatformImpl.Handle.Handle;
if (_HookedWindows.ContainsKey(hwnd))
{
return;
}
WindowsHwndSource source = WindowsHwndSource.FromHwnd(hwnd);
if (source == null)
{
return;
}
_HookedWindows.Add(hwnd, new GlobalHooks(source, window));
}
private GlobalHooks(WindowsHwndSource source, Window window)
{
_source = source;
_windowRef = new WeakReference <Window>(window);
source.WndProcCallback = WndProc;
}