How Can I Handle WndProc Messages in WPF?

Handling WndProc Messages in WPF: Developer Guide

If you are familiar with Windows Forms, you may be wondering how to handle WndProc messages in WPF. This article will explore an effective way to achieve this.

In Windows Forms, overriding the WndProc method allows developers to process messages when they are received. Although this is not directly possible in WPF, the System.Windows.Interop namespace provides a solution through the HwndSource class.

To get started, please follow these steps:

1. Add a reference to System.Windows.Interop in your project.
2. In your main application window, override the OnSourceInitialized method:

<code class="language-csharp">protected override void OnSourceInitialized(EventArgs e)
{
    base.OnSourceInitialized(e);
    HwndSource source = PresentationSource.FromVisual(this) as HwndSource;
    source.AddHook(WndProc);
}</code>

3. Define the WndProc method, which will handle incoming messages:

<code class="language-csharp">private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    // 在此处处理消息...

    return IntPtr.Zero;
}</code>

The WndProc method provides you with the functionality to process messages. For a more detailed explanation and more examples, see Steve Rands' excellent blog post on "Using a custom WndProc in a WPF application".

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