How Can I Implement WndProc-like Message Handling in WPF?

Implement WndProc-like message processing in WPF

In Windows Forms, handling messages is straightforward by overriding WndProc. However, WPF offers a different approach. This article dives into how to emulate similar functionality in WPF, allowing developers to intercept and process messages directly.

To handle WndProc messages in WPF, the System.Windows.Interop namespace provides a key component: the HwndSource class. It creates a bridge between WPF and the underlying Windows Message Pump.

Let’s look at an example to illustrate this process:

<code class="language-csharp">using System;
using System.Windows;
using System.Windows.Interop;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        protected override void OnSourceInitialized(EventArgs e)
        {
            base.OnSourceInitialized(e);
            HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
            source.AddHook(WndProc);
        }

        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            // 在此处实现消息处理逻辑...

            return IntPtr.Zero;
        }
    }
}</code>

In this example, the OnSourceInitialized method (triggered when the HWND of the WPF window is created) is overridden to register a WndProc hook. This hook redirects all messages sent to the window to the WndProc method, allowing custom message handling. Within a WndProc method, developers can implement logic to handle specific messages, interact with the underlying operating system, or perform platform-specific operations.

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