C＃を使用してグローバルホットキーを設定する

Question

プログラムに焦点が合っていないときにキーを押す必要があります。 （すなわち。 Ctrl+Alt+J）そして私のプログラムでイベントをトリガーします。

これまでのところ、正しいパスのように見えるこのdllを見つけました」

[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

このコードコンソールアプリケーションプロジェクトでイベントをトリガーしないに注意してください。イベントを起動するには、WinFormsプロジェクトを使用する必要があります。

これは正しいコードです：

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
}

使用するには（修飾キーを編集してそれらをキャストする必要がありました（modifier）1（modifier）2 etc

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

動作中の vb.net port of original answer ：

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

タスク：

1. 以下の_Application1_の2つのインスタンスをアプリケーションの名前に置き換えます（Visual StudioSolution Explorerウィンドウでツリーのルートとして見ることができます）。
2. AddGlobalHotkeySupport()への呼び出しをアプリケーションの初期化段階に追加します。
3. RemoveGlobalHotkeySupport()への呼び出しをアプリケーションの最終段階に追加します。

コード：

_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
_