private static void HookUpDefWindowProc(IntPtr hwnd)
{
SecurityHelper.DemandUnmanagedCode();
#if LOGGING
LogFinishHWND(hwnd, "Core HookUpDWP");
#endif
IntPtr result = IntPtr.Zero;
// We've already cleaned up, return immediately.
if (hwnd == IntPtr.Zero)
{
return;
}
IntPtr defWindowProc = GetDefWindowProcAddress(hwnd);
if (defWindowProc != IntPtr.Zero)
{
try
{
result = UnsafeNativeMethods.SetWindowLong(new HandleRef(null, hwnd), NativeMethods.GWL_WNDPROC, defWindowProc);
}
catch (System.ComponentModel.Win32Exception e)
{
// We failed to change the window proc. Now what?
if (e.NativeErrorCode != 1400) // ERROR_INVALID_WINDOW_HANDLE
{
// For debugging purposes, throw an exception so we can debug
// this and know if it's possible to call SetWindowLong on
// the wrong thread.
throw;
}
}
if (result != IntPtr.Zero)
{
UnsafeNativeMethods.PostMessage(new HandleRef(null, hwnd), WindowMessage.WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
}
}
}