当我的节目不在焦点时,我需要捕捉按键.(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似乎是正确的路径"
[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);
Aar*_*nLS 77
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项目来触发事件.
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(我必须编辑修改键以投射它们(修饰符)1(修饰符)2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();
}
}
我从 AaronLS 那里得到了答案，并重新编写了一些简单的单行注册。
注册：
GlobalHotKey.RegisterHotKey("Alt + Shift + S", () => DoSomething());
班上：
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows.Input;
public class GlobalHotKey : IDisposable
{
/// <summary>
/// Registers a global hotkey
/// </summary>
/// <param name="aKeyGesture">e.g. Alt + Shift + Control + Win + S</param>
/// <param name="aAction">Action to be called when hotkey is pressed</param>
/// <returns>true, if registration succeeded, otherwise false</returns>
public static bool RegisterHotKey(string aKeyGestureString, Action aAction)
{
var c = new KeyGestureConverter();
KeyGesture aKeyGesture = (KeyGesture)c.ConvertFrom(aKeyGestureString);
return RegisterHotKey(aKeyGesture.Modifiers, aKeyGesture.Key, aAction);
}
public static bool RegisterHotKey(ModifierKeys aModifier, Key aKey, Action aAction)
{
if(aModifier == ModifierKeys.None)
{
throw new ArgumentException("Modifier must not be ModifierKeys.None");
}
if (aAction is null)
{
throw new ArgumentNullException(nameof(aAction));
}
System.Windows.Forms.Keys aVirtualKeyCode = (System.Windows.Forms.Keys)KeyInterop.VirtualKeyFromKey(aKey);
currentID = currentID + 1;
bool aRegistered = RegisterHotKey(window.Handle, currentID,
(uint)aModifier | MOD_NOREPEAT,
(uint)aVirtualKeyCode);
if(aRegistered)
{
registeredHotKeys.Add(new HotKeyWithAction(aModifier, aKey, aAction));
}
return aRegistered;
}
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();
}
static GlobalHotKey()
{
window.KeyPressed += (s, e) =>
{
registeredHotKeys.ForEach(x =>
{
if (e.Modifier == x.Modifier && e.Key == x.Key)
{
x.Action();
}
});
};
}
private static readonly InvisibleWindowForMessages window = new InvisibleWindowForMessages();
private static int currentID;
private static uint MOD_NOREPEAT = 0x4000;
private static List<HotKeyWithAction> registeredHotKeys = new List<HotKeyWithAction>();
private class HotKeyWithAction
{
public HotKeyWithAction(ModifierKeys modifier, Key key, Action action)
{
Modifier = modifier;
Key = key;
Action = action;
}
public ModifierKeys Modifier { get; }
public Key Key { get; }
public Action Action { get; }
}
// 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);
private class InvisibleWindowForMessages : System.Windows.Forms.NativeWindow, IDisposable
{
public InvisibleWindowForMessages()
{
CreateHandle(new System.Windows.Forms.CreateParams());
}
private static int WM_HOTKEY = 0x0312;
protected override void WndProc(ref System.Windows.Forms.Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_HOTKEY)
{
var aWPFKey = KeyInterop.KeyFromVirtualKey(((int)m.LParam >> 16) & 0xFFFF);
ModifierKeys modifier = (ModifierKeys)((int)m.LParam & 0xFFFF);
if (KeyPressed != null)
{
KeyPressed(this, new HotKeyPressedEventArgs(modifier, aWPFKey));
}
}
}
public class HotKeyPressedEventArgs : EventArgs
{
private ModifierKeys _modifier;
private Key _key;
internal HotKeyPressedEventArgs(ModifierKeys modifier, Key key)
{
_modifier = modifier;
_key = key;
}
public ModifierKeys Modifier
{
get { return _modifier; }
}
public Key Key
{
get { return _key; }
}
}
public event EventHandler<HotKeyPressedEventArgs> KeyPressed;
#region IDisposable Members
public void Dispose()
{
this.DestroyHandle();
}
#endregion
}
}
Imports System.Runtime.InteropServices\n\nPublic NotInheritable Class KeyboardHook\n Implements IDisposable\n\n \' Registers a hot key with Windows.\n <DllImport("user32.dll")> _\n Private Shared Function RegisterHotKey(hWnd As IntPtr, id As Integer, fsModifiers As UInteger, vk As UInteger) As Boolean\n End Function\n\n \' Unregisters the hot key with Windows.\n <DllImport("user32.dll")> _\n Private Shared Function UnregisterHotKey(hWnd As IntPtr, id As Integer) As Boolean\n End Function\n\n \'\'\' <summary>\n \'\'\' Represents the window that is used internally to get the messages.\n \'\'\' </summary>\n Private Class Window\n Inherits NativeWindow\n Implements IDisposable\n Private Shared WM_HOTKEY As Integer = &H312\n\n Public Sub New()\n \' create the handle for the window.\n Me.CreateHandle(New CreateParams())\n End Sub\n\n Public Event KeyPressed As EventHandler(Of KeyPressedEventArgs)\n\n \'\'\' <summary>\n \'\'\' Overridden to get the notifications.\n \'\'\' </summary>\n \'\'\' <param name="m"></param>\n Protected Overrides Sub WndProc(ByRef m As Message)\n MyBase.WndProc(m)\n\n \' check if we got a hot key pressed.\n If m.Msg = WM_HOTKEY Then\n \' get the keys.\n Dim key As Keys = DirectCast((CInt(m.LParam) >> 16) And &HFFFF, Keys)\n Dim modifier As ModifierKeys = DirectCast(CUInt(CInt(m.LParam) And &HFFFF), ModifierKeys)\n\n \' invoke the event to notify the parent.\n RaiseEvent KeyPressed(Me, New KeyPressedEventArgs(modifier, key))\n End If\n End Sub\n\n#Region " IDisposable Members"\n\n Public Sub Dispose() Implements IDisposable.Dispose\n Me.DestroyHandle()\n End Sub\n\n#End Region\n End Class\n\n Private _window As New Window()\n Private _currentId As Integer\n\n Public Sub New()\n \' register the event of the inner native window.\n AddHandler _window.KeyPressed, Sub(sender As Object, args As KeyPressedEventArgs)\n RaiseEvent KeyPressed(Me, args)\n End Sub\n End Sub\n\n \'\'\' <summary>\n \'\'\' Registers a hot key in the system.\n \'\'\' </summary>\n \'\'\' <param name="modifier">The modifiers that are associated with the hot key.</param>\n \'\'\' <param name="key">The key itself that is associated with the hot key.</param>\n Public Sub RegisterHotKey(modifier As ModifierKeys, key As Keys)\n \' increment the counter.\n _currentId = _currentId + 1\n\n \' register the hot key.\n If Not RegisterHotKey(_window.Handle, _currentId, DirectCast(modifier, UInteger), CUInt(key)) Then\n \'Throw New InvalidOperationException("Couldn\xe2\x80\x99t register the hot key.")\n \'or use MsgBox("Couldn\xe2\x80\x99t register the hot key.")\n End If\n End Sub\n\n \'\'\' <summary>\n \'\'\' A hot key has been pressed.\n \'\'\' </summary>\n Public Event KeyPressed As EventHandler(Of KeyPressedEventArgs)\n\n#Region " IDisposable Members"\n\n Public Sub Dispose() Implements IDisposable.Dispose\n \' unregister all the registered hot keys.\n Dim i As Integer = _currentId\n While i > 0\n UnregisterHotKey(_window.Handle, i)\n System.Math.Max(System.Threading.Interlocked.Decrement(i), i + 1)\n End While\n\n \' dispose the inner native window.\n _window.Dispose()\n End Sub\n\n#End Region\nEnd Class\n\n\'\'\' <summary>\n\'\'\' Event Args for the event that is fired after the hot key has been pressed.\n\'\'\' </summary>\nPublic Class KeyPressedEventArgs\n Inherits EventArgs\n Private _modifier As ModifierKeys\n Private _key As Keys\n\n Friend Sub New(modifier As ModifierKeys, key As Keys)\n _modifier = modifier\n _key = key\n End Sub\n\n Public ReadOnly Property Modifier() As ModifierKeys\n Get\n Return _modifier\n End Get\n End Property\n\n Public ReadOnly Property Key() As Keys\n Get\n Return _key\n End Get\n End Property\nEnd Class\n\n\'\'\' <summary>\n\'\'\' The enumeration of possible modifiers.\n\'\'\' </summary>\n<Flags> _\nPublic Enum ModifierKeys As UInteger\n Alt = 1\n Control = 2\n Shift = 4\n Win = 8\nEnd Enum\n任务：
\n\nApplication1窗口中的树根）。AddGlobalHotkeySupport()应用程序的初始化阶段。RemoveGlobalHotkeySupport()应用程序的最终确定阶段。代码：
\n\nPublic Sub AddGlobalHotkeySupport() \'TODO: call this at initialization of the application\n\n \' register the event that is fired after the key press.\n AddHandler hook.KeyPressed, AddressOf hook_KeyPressed\n\n \' register the control + alt + F12 combination as hot key.\n hook.RegisterHotKey(Application1.ModifierKeys.Control Or Application1.ModifierKeys.Alt, Keys.F12)\n\nEnd Sub\n\nPublic Sub RemoveGlobalHotkeySupport() \'TODO: call this at finalization of the application\n \' unregister all registered hot keys.\n hook.Dispose()\nEnd Sub\n\nPrivate Sub hook_KeyPressed(sender As Object, e As KeyPressedEventArgs)\n \' show the keys pressed in a label.\n MsgBox(e.Modifier.ToString() + " + " + e.Key.ToString())\nEnd Sub\n