How to Register a Global CTRL SHIFT (LETTER) Hotkey in WPF with .NET 3.5?

Register global hotkeys to detect CTRL SHIFT (letter) in WPF and .NET 3.5

When developing desktop applications in WPF with .NET 3.5, binding to specific key combinations or even the Windows key is a common requirement. Let’s explore how to implement this feature:

Register global hotkeys

To register a global hotkey that triggers a specific action when pressed, you can use the RegisterHotKey and UnregisterHotKey functions in the user32.dll library. These functions take arguments that define the hotkey modifier (for example, the Control, Shift, or Windows key) and the virtual key code that represents the desired letter.

Bound to key

In your WPF application, create a HotKey class to manage hotkey registration and event handling. This class can be initialized with the desired key combination and the action to be performed when the hotkey is triggered. Call the Register() method to register hotkeys system-wide.

Unbind keys

When you no longer need a specific hotkey, you can call the Unregister() method to delete its registration. This ensures that the hotkey no longer responds to input.

Sample code

The code provided demonstrates a complete implementation of the HotKey class, which can be used to bind to any key combination, including CTRL SHIFT (letter). It also shows the registration and event handling mechanisms:

public class HotKey : IDisposable
{
    public Key Key { get; private set; }
    public KeyModifier KeyModifiers { get; private set; }
    public Action<HotKey> Action { get; private set; }
    public int Id { get; set; }
    // (代码继续...)
}

private static void ComponentDispatcherThreadFilterMessage(ref MSG msg, ref bool handled)
{
    // (代码继续...)
}

// 使用示例：

_hotKey = new HotKey(Key.F9, KeyModifier.Shift | KeyModifier.Win, OnHotKeyHandler);

private void OnHotKeyHandler(HotKey hotKey)
{
    // 处理热键事件
}

This code snippet creates a hotkey object with KeyModifier Shift and Win and Key F9. When the OnHotKeyHandler method is executed, it indicates that this hotkey combination has been pressed.

Contains Windows key

To register a hotkey that includes the Windows key, you can use the KeyModifier.Win flag in the KeyModifiers parameter when calling the Register method. This allows you to capture hotkey combinations with this modifier, such as Win L to lock the computer.

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