private void Initialize() {
consoleHandler = new NativeMethods.ConHndlr(this.ConsoleHandlerProc);
if (!UnsafeNativeMethods.SetConsoleCtrlHandler(consoleHandler, 1)) {
Debug.Fail("Failed to install console handler.");
consoleHandler = null;
}
windowHandle = CreateBroadcastWindow();
Debug.Assert(windowHandle != IntPtr.Zero, "CreateBroadcastWindow failed");
AppDomain.CurrentDomain.ProcessExit += new EventHandler(SystemEvents.Shutdown);
AppDomain.CurrentDomain.DomainUnload += new EventHandler(SystemEvents.Shutdown);
}
public static extern bool SetConsoleCtrlHandler(NativeMethods.ConHndlr handler, int add);
private void Dispose() {
if (windowHandle != IntPtr.Zero) {
if (registeredSessionNotification) {
UnsafeNativeMethods.WTSUnRegisterSessionNotification(new HandleRef(systemEvents, systemEvents.windowHandle));
}
IntPtr handle = windowHandle;
windowHandle = IntPtr.Zero;
HandleRef href = new HandleRef(this, handle);
//we check IsWindow because Application may have rudely destroyed our broadcast window.
//if this were true, we want to unregister the class.
if (UnsafeNativeMethods.IsWindow(href) && DefWndProc != IntPtr.Zero) {
UnsafeNativeMethods.SetWindowLong(href, NativeMethods.GWL_WNDPROC, new HandleRef(this, DefWndProc));
//set our sentinel value that we will look for upon initialization to indicate
//the window class belongs to an unloaded appdomain and therefore should not be used.
UnsafeNativeMethods.SetClassLong(href, NativeMethods.GCL_WNDPROC, DefWndProc);
}
// If DestroyWindow failed, it is because we're being
// shutdown from another thread. In this case, locate the
// DefWindowProc call in User32, sling the window back to it,
// and post a nice fat WM_CLOSE
//
if (UnsafeNativeMethods.IsWindow(href) && !UnsafeNativeMethods.DestroyWindow(href)) {
UnsafeNativeMethods.PostMessage(href, NativeMethods.WM_CLOSE, IntPtr.Zero, IntPtr.Zero);
}
else {
IntPtr hInstance = UnsafeNativeMethods.GetModuleHandle(null);
UnsafeNativeMethods.UnregisterClass(className, new HandleRef(this, hInstance));
}
}
if (consoleHandler != null) {
UnsafeNativeMethods.SetConsoleCtrlHandler(consoleHandler, 0);
consoleHandler = null;
}
}
