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【已解决】C#中如何注册/获得/捕获全局热键/快捷键

C# crifan 1424浏览 0评论

【问题】

一个C#窗体程序,想要实现,不论程序是否获得当前焦点,都要能够捕获到全局的某个设置好的快捷键。

比如按Ctrl+Alt+Shift+M,然后程序就可以捕获到。

【解决过程】

1.从这里:c#全局热键+获取窗口句柄,得知有个RegisterHotKey的。

2.然后就找到这里:Set global hotkeys using C#,参考其代码,去添加了如下代码:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace downloadSongtasteMusic
{

    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
    }

    public partial class frmDownloadSonstasteMusic : Form
    {
        KeyboardHook hook = new KeyboardHook();

        public frmDownloadSonstasteMusic()
        {
            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);
        }

        private void frmDownloadSonstasteMusic_Load(object sender, EventArgs e)
        {

        }

        private void frmDownloadSonstasteMusic_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                Hide();  // 隐藏窗体
                nfiSystem.Visible = true;  // 系统托盘图标可见
            } 

        }

        private void nfiSystem_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            this.nfiSystem.Visible = false;
        }
    }
}

结果编译出错:

D:\xxx\downloadSongtasteMusic\frmDownloadSonstasteMusic.cs(15,10): error CS0246: The type or namespace name ‘DllImport’ could not be found (are you missing a using directive or an assembly reference?)

然后就先去解决DllImport的问题。

3.然后解决了上述DllImport的问题:

【已解决】error CS0246: The type or namespace name ‘DllImport’ could not be found (are you missing a using directive or an assembly reference?)

4.接着编译又出现了错误,是关于上述代码中的ModifierKeys,折腾了一下,发现好像是和系统自带的ModifierKeys有冲突,所以自己将其改为ModifierKeys_e,然后才解决问题。

其中,还由于把上面一堆代码,拷贝到当前那个窗体对应的cs文件:frmDownloadSonstasteMusic.cs中,无法工作,然后把这代码都放到另外的一个文件Program.cs,然后才可以正常使用,窗体才可以正常显示。

然后运行了一下,同时按Ctrl+Alt+F12,就可以捕获,并在texBox中显示出来了。

 

最后工作的代码是:

(1)Program.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace downloadSongtasteMusic
{

    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_e modifier = (ModifierKeys_e)((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_e 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_e _modifier;
        private Keys _key;

        internal KeyPressedEventArgs(ModifierKeys_e modifier, Keys key)
        {
            _modifier = modifier;
            _key = key;
        }

        public ModifierKeys_e Modifier
        {
            get { return _modifier; }
        }

        public Keys Key
        {
            get { return _key; }
        }
    }

    /// <summary>
    /// The enumeration of possible modifiers.
    /// </summary>
    [Flags]
    public enum ModifierKeys_e : uint
    {
        Alt = 1,
        Control = 2,
        Shift = 4,
        Win = 8
    }

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new frmDownloadSonstasteMusic());
        }
    }
}

(2)frmDownloadSonstasteMusic.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace downloadSongtasteMusic
{


    public partial class frmDownloadSonstasteMusic : Form
    {
        KeyboardHook hook = new KeyboardHook();

        public frmDownloadSonstasteMusic()
        {
            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);
            hook.RegisterHotKey(ModifierKeys_e.Control | ModifierKeys_e.Alt, Keys.F12);
        }
        
        void hook_KeyPressed(object sender, KeyPressedEventArgs e)
        {
            // show the keys pressed in a label.
            rtbInfo.Text = e.Modifier.ToString() + " + " + e.Key.ToString();
        }

        private void frmDownloadSonstasteMusic_Load(object sender, EventArgs e)
        {

        }

        private void frmDownloadSonstasteMusic_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                Hide();  // 隐藏窗体
                nfiSystem.Visible = true;  // 系统托盘图标可见
            } 

        }

        private void nfiSystem_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            this.nfiSystem.Visible = false;
        }
    }
}

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