CODEWITHSUNDEEP
c#.netwinapihook
Aster Veigas
Aster Veigas

Reputation: 876

Hook to receive window created and destroyed notification

I use RegisterWindowMessage("SHELLHOOK") to register for window create and destroy events. My code is written in C#. The code works perfectly when I'm debugging the code. But when I run the program without debugging, I'm not getting WndProc messages like I used to get while debugging. Does Windows block the hook?

class ShellHook:NativeWindow
{
    public ShellHook(IntPtr hWnd)
    {
        if (Win32.RegisterShellHookWindow(this.Handle))
        {
            WM_ShellHook    = Win32.RegisterWindowMessage("SHELLHOOK");
        }
    }

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_ShellHook)
        {
            switch((ShellEvents)m.WParam)
            {
                    //m.lparam
                case ShellEvents.HSHELL_WINDOWCREATED:
                    if (windowCreatedEvent != null)
                    {
                        windowCreatedEvent(m.LParam);
                    }
                    break;

                case ShellEvents.HSHELL_WINDOWDESTROYED:
                    if (windowDestroyedEvent != null)
                    {
                        windowDestroyedEvent(m.LParam);
                    }
                    break;
            }
        }
        base.WndProc(ref m);
    }
}

This is how I start my wpf app.

 public partial class App : Application
 {
    MainWindow mainWindowView;

    public App()
    {
        Startup += new StartupEventHandler(App_Startup);
    }

    void App_Startup(object sender, StartupEventArgs e)
    {
        mainWindowView = new MainWindow();
        MainWindowViewModel mainWindowViewModel = new MainWindowViewModel();
        mainWindowView.DataContext = mainWindowViewModel;
        mainWindowView.ShowDialog();
    }
 }

My MainWindowViewModel Constructor is as follows:

 public MainWindowViewModel()
    {
        EnumWindows(new EnumWindowsProc(EnumTheWindows), IntPtr.Zero);
        System.Windows.Forms.Form f = new System.Windows.Forms.Form();
        ShellHook shellHookObject = new ShellHook(f.Handle);
        shellHookObject.windowCreatedEvent += shellHookObject_windowCreatedEvent;
        shellHookObject.windowDestroyedEvent += shellHookObject_windowDestroyedEvent;
    }

Upvotes: 1

Views: 2326

Answers (1)

Aster Veigas
Aster Veigas

Reputation: 876

I changed the NativeWindow to Form and it looks like its working now. Guys please let me know your thoughts.

Upvotes: 1

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