使用C＃设置全局热键

当我的程序没有焦点时，我需要捕获按键。 （即Ctrl + Alt + J ），并在我的程序中触发一个事件。

到目前为止，我发现这个DLL似乎是正确的path“

[DllImport("user32.dll")]private static extern int RegisterHotKey(IntPtr hwnd, int id,int fsModifiers, int vk); [DllImport("user32.dll")] private static extern int UnregisterHotKey(IntPtr hwnd, int id); 

Answer 1

请注意，此代码不会触发控制台应用程序项目中的事件 。 您必须使用WinForms项目才能触发事件。

这是正确的代码：

 public sealed class KeyboardHook : IDisposable { // Registers a hot key with Windows. [DllImport("user32.dll")] private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk); // Unregisters the hot key with Windows. [DllImport("user32.dll")] private static extern bool UnregisterHotKey(IntPtr hWnd, int id); /// <summary> /// Represents the window that is used internally to get the messages. /// </summary> private class Window : NativeWindow, IDisposable { private static int WM_HOTKEY = 0x0312; public Window() { // create the handle for the window. this.CreateHandle(new CreateParams()); } /// <summary> /// Overridden to get the notifications. /// </summary> /// <param name="m"></param> protected override void WndProc(ref Message m) { base.WndProc(ref m); // check if we got a hot key pressed. if (m.Msg == WM_HOTKEY) { // get the keys. Keys key = (Keys)(((int)m.LParam >> 16) & 0xFFFF); ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF); // invoke the event to notify the parent. if (KeyPressed != null) KeyPressed(this, new KeyPressedEventArgs(modifier, key)); } } public event EventHandler<KeyPressedEventArgs> KeyPressed; #region IDisposable Members public void Dispose() { this.DestroyHandle(); } #endregion } private Window _window = new Window(); private int _currentId; public KeyboardHook() { // register the event of the inner native window. _window.KeyPressed += delegate(object sender, KeyPressedEventArgs args) { if (KeyPressed != null) KeyPressed(this, args); }; } /// <summary> /// Registers a hot key in the system. /// </summary> /// <param name="modifier">The modifiers that are associated with the hot key.</param> /// <param name="key">The key itself that is associated with the hot key.</param> public void RegisterHotKey(ModifierKeys modifier, Keys key) { // increment the counter. _currentId = _currentId + 1; // register the hot key. if (!RegisterHotKey(_window.Handle, _currentId, (uint)modifier, (uint)key)) throw new InvalidOperationException("Couldn't register the hot key."); } /// <summary> /// A hot key has been pressed. /// </summary> public event EventHandler<KeyPressedEventArgs> KeyPressed; #region IDisposable Members public void Dispose() { // unregister all the registered hot keys. for (int i = _currentId; i > 0; i--) { UnregisterHotKey(_window.Handle, i); } // dispose the inner native window. _window.Dispose(); } #endregion } /// <summary> /// Event Args for the event that is fired after the hot key has been pressed. /// </summary> public class KeyPressedEventArgs : EventArgs { private ModifierKeys _modifier; private Keys _key; internal KeyPressedEventArgs(ModifierKeys modifier, Keys key) { _modifier = modifier; _key = key; } public ModifierKeys Modifier { get { return _modifier; } } public Keys Key { get { return _key; } } } /// <summary> /// The enumeration of possible modifiers. /// </summary> [Flags] public enum ModifierKeys : uint { Alt = 1, Control = 2, Shift = 4, Win = 8 } 

使用（我必须编辑修饰键来施放它们（修饰符）1（修饰符）2等等

 public partial class Form1 : Form { KeyboardHook hook = new KeyboardHook(); public Form1() { InitializeComponent(); // register the event that is fired after the key press. hook.KeyPressed += new EventHandler<KeyPressedEventArgs>(hook_KeyPressed); // register the control + alt + F12 combination as hot key. hook.RegisterHotKey(ModifierKeys.Control | ModifierKeys.Alt, Keys.F12); } void hook_KeyPressed(object sender, KeyPressedEventArgs e) { // show the keys pressed in a label. label1.Text = e.Modifier.ToString() + " + " + e.Key.ToString(); } } 

Answer 2

这里是一个工作vb.net端口的原始答案 ：

KeyboardHook.vb

 Imports System.Runtime.InteropServices Public NotInheritable Class KeyboardHook Implements IDisposable ' Registers a hot key with Windows. <DllImport("user32.dll")> _ Private Shared Function RegisterHotKey(hWnd As IntPtr, id As Integer, fsModifiers As UInteger, vk As UInteger) As Boolean End Function ' Unregisters the hot key with Windows. <DllImport("user32.dll")> _ Private Shared Function UnregisterHotKey(hWnd As IntPtr, id As Integer) As Boolean End Function ''' <summary> ''' Represents the window that is used internally to get the messages. ''' </summary> Private Class Window Inherits NativeWindow Implements IDisposable Private Shared WM_HOTKEY As Integer = &H312 Public Sub New() ' create the handle for the window. Me.CreateHandle(New CreateParams()) End Sub Public Event KeyPressed As EventHandler(Of KeyPressedEventArgs) ''' <summary> ''' Overridden to get the notifications. ''' </summary> ''' <param name="m"></param> Protected Overrides Sub WndProc(ByRef m As Message) MyBase.WndProc(m) ' check if we got a hot key pressed. If m.Msg = WM_HOTKEY Then ' get the keys. Dim key As Keys = DirectCast((CInt(m.LParam) >> 16) And &HFFFF, Keys) Dim modifier As ModifierKeys = DirectCast(CUInt(CInt(m.LParam) And &HFFFF), ModifierKeys) ' invoke the event to notify the parent. RaiseEvent KeyPressed(Me, New KeyPressedEventArgs(modifier, key)) End If End Sub #Region " IDisposable Members" Public Sub Dispose() Implements IDisposable.Dispose Me.DestroyHandle() End Sub #End Region End Class Private _window As New Window() Private _currentId As Integer Public Sub New() ' register the event of the inner native window. AddHandler _window.KeyPressed, Sub(sender As Object, args As KeyPressedEventArgs) RaiseEvent KeyPressed(Me, args) End Sub End Sub ''' <summary> ''' Registers a hot key in the system. ''' </summary> ''' <param name="modifier">The modifiers that are associated with the hot key.</param> ''' <param name="key">The key itself that is associated with the hot key.</param> Public Sub RegisterHotKey(modifier As ModifierKeys, key As Keys) ' increment the counter. _currentId = _currentId + 1 ' register the hot key. If Not RegisterHotKey(_window.Handle, _currentId, DirectCast(modifier, UInteger), CUInt(key)) Then 'Throw New InvalidOperationException("Couldn't register the hot key.") 'or use MsgBox("Couldn't register the hot key.") End If End Sub ''' <summary> ''' A hot key has been pressed. ''' </summary> Public Event KeyPressed As EventHandler(Of KeyPressedEventArgs) #Region " IDisposable Members" Public Sub Dispose() Implements IDisposable.Dispose ' unregister all the registered hot keys. Dim i As Integer = _currentId While i > 0 UnregisterHotKey(_window.Handle, i) System.Math.Max(System.Threading.Interlocked.Decrement(i), i + 1) End While ' dispose the inner native window. _window.Dispose() End Sub #End Region End Class ''' <summary> ''' Event Args for the event that is fired after the hot key has been pressed. ''' </summary> Public Class KeyPressedEventArgs Inherits EventArgs Private _modifier As ModifierKeys Private _key As Keys Friend Sub New(modifier As ModifierKeys, key As Keys) _modifier = modifier _key = key End Sub Public ReadOnly Property Modifier() As ModifierKeys Get Return _modifier End Get End Property Public ReadOnly Property Key() As Keys Get Return _key End Get End Property End Class ''' <summary> ''' The enumeration of possible modifiers. ''' </summary> <Flags> _ Public Enum ModifierKeys As UInteger Alt = 1 Control = 2 Shift = 4 Win = 8 End Enum 

Form1.vb的

任务：

1. 将下面的Application1两个实例replace为您的应用程序的名称（可以在Visual Studio Solution Explorer窗口中将其视为树的根）。
2. 将AddGlobalHotkeySupport()调用添加到应用程序的初始化阶段。
3. 将调用添加到RemoveGlobalHotkeySupport()到您的应用程序的最终阶段。

码：

 Public Sub AddGlobalHotkeySupport() 'TODO: call this at initialization of the application ' register the event that is fired after the key press. AddHandler hook.KeyPressed, AddressOf hook_KeyPressed ' register the control + alt + F12 combination as hot key. hook.RegisterHotKey(Application1.ModifierKeys.Control Or Application1.ModifierKeys.Alt, Keys.F12) End Sub Public Sub RemoveGlobalHotkeySupport() 'TODO: call this at finalization of the application ' unregister all registered hot keys. hook.Dispose() End Sub Private Sub hook_KeyPressed(sender As Object, e As KeyPressedEventArgs) ' show the keys pressed in a label. MsgBox(e.Modifier.ToString() + " + " + e.Key.ToString()) End Sub