How Do I Handle WndProc Messages in WPF?

Handling WndProc messages in WPF

In Windows Forms, handling WndProc messages is a simple process. In WPF, however, the approach is slightly different.

Use HwndSource class

WPF provides the System.Windows.Interop namespace, which contains the HwndSource class. This class allows interception and processing of WndProc messages.

Example implementation

The following code snippet provides an example of using the HwndSource class to handle WndProc messages in WPF:

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)
        {
            // 在此处处理消息...

            return IntPtr.Zero;
        }
    }
}

In this example:

• The WndProc method in the Window1 class is overridden to handle incoming messages.
• OnSourceInitialized event is used to attach the WndProc hook to the HwndSource associated with the window.

More information

For a more detailed explanation of this technique, see Steve Rands' excellent blog post on using custom WndProc in WPF applications.

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