WinForm和WPF中注册热键

喜欢ヅ旅行 2021-12-12 05:31 249阅读 0赞

由于.Net没有提供专门的类库处理热键，所以需要直接调用windows API来解决。

HotKey为.NET调用Windows API的封装代码，主要是RegisterHotKey和UnregisterHotKey

class HotKey
        {
            /// <summary> 
            /// 如果函数执行成功，返回值不为0。 
            /// 如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。.NET方法:Marshal.GetLastWin32Error() 
            /// </summary> 
            /// <param name="hWnd">要定义热键的窗口的句柄</param> 
            /// <param name="id">定义热键ID（不能与其它ID重复） </param> 
            /// <param name="fsModifiers">标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效</param> 
            /// <param name="vk">定义热键的内容,WinForm中可以使用Keys枚举转换， 
            /// WPF中Key枚举是不正确的,应该使用System.Windows.Forms.Keys枚举，或者自定义正确的枚举或int常量</param> 
            /// <returns></returns> 
            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool RegisterHotKey(
            IntPtr hWnd,
            int id,
            KeyModifiers fsModifiers,
            int vk
            );
            /// <summary> 
            /// 取消注册热键 
            /// </summary> 
            /// <param name="hWnd">要取消热键的窗口的句柄</param> 
            /// <param name="id">要取消热键的ID</param> 
            /// <returns></returns> 
            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool UnregisterHotKey(
            IntPtr hWnd,
            int id
            );
            /// <summary> 
            /// 向全局原子表添加一个字符串，并返回这个字符串的唯一标识符,成功则返回值为新创建的原子ID,失败返回0 
            /// </summary> 
            /// <param name="lpString"></param> 
            /// <returns></returns> 
            [DllImport("kernel32", SetLastError = true)]
            public static extern short GlobalAddAtom(string lpString);
            [DllImport("kernel32", SetLastError = true)]
            public static extern short GlobalDeleteAtom(short nAtom);
            /// <summary> 
            /// 定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值） 
            /// </summary> 
            [ComVisible(true)]
            [Flags]
            [TypeConverter(typeof(KeysConverter))]
            public enum KeyModifiers
            {
                None = 0,
                Alt = 1,
                Ctrl = 2,
                Shift = 4,
                WindowsKey = 8
            }
        }

Windows Form中调用代码

private void Form1_Activated(object sender, EventArgs e)
            {
                HotKey.RegisterHotKey(Handle, 102, HotKey.KeyModifiers.Alt | HotKey.KeyModifiers.Ctrl, Keys.S);
                HotKey.RegisterHotKey(Handle, 100, HotKey.KeyModifiers.Shift, Keys.S);
    
            }
    
            private void Form1_Leave(object sender, EventArgs e)
            {
                HotKey.UnregisterHotKey(Handle, 102);
                HotKey.UnregisterHotKey(Handle, 100);
            }
    
            /// 
            /// 监视Windows消息
            /// 重载WndProc方法，用于实现热键响应
            /// 
            /// 
            protected override void WndProc(ref Message m)
            {
                const int WM_HOTKEY = 0x0312;//如果m.Msg的值为0x0312那么表示用户按下了热键
                //按快捷键 
                switch (m.Msg)
                {
                    case WM_HOTKEY:
                        switch (m.WParam.ToInt32())
                        {
                            case 100:    //按下的是Shift+S
                                //此处填写快捷键响应代码     
                                MessageBox.Show("按下的是Shift+S");    
                                break;
                            case 101:    //按下的是Ctrl+B
                                //此处填写快捷键响应代码
                                break;
                            case 102:    //按下的是Ctrl+Alt+S
                                CaptureImageTool capture = new CaptureImageTool();
    
                                if (capture.ShowDialog() == DialogResult.OK)
                                {
                                    Image image = capture.Image;
                                    pictureBox1.Width = image.Width;
                                    pictureBox1.Height = image.Height;
                                    pictureBox1.Image = image;
                                }
                                break;
                        }
                        break;
                }
                base.WndProc(ref m);
            }

WPF中窗口句柄需要借助WindowInteropHelper来得到，处理函数的加入和Winform不同，需要HwndSource来添加处理函数。

void MainWindow_Unloaded(object sender, RoutedEventArgs e)
            {
                UnRegisterHotKey();
            }
    
            void MainWindow_Loaded(object sender, RoutedEventArgs e)
            {
                RegisterHotKey();
            }
    
            private void UnRegisterHotKey()
            {
                IntPtr handle = new WindowInteropHelper(this).Handle;
                int id = 1000;
                bool r = HotKey.UnregisterHotKey(handle, id);
    
                HotKey.UnregisterHotKey(handle, 102);
                HotKey.UnregisterHotKey(handle, 100);
            }
    
            private void RegisterHotKey()
            {
                IntPtr handle = new WindowInteropHelper(this).Handle;
                int id = 1000;
                bool r = HotKey.RegisterHotKey(handle, id, HotKey.KeyModifiers.Ctrl, (int)System.Windows.Forms.Keys.F12);
    
                HotKey.RegisterHotKey(handle, 102, HotKey.KeyModifiers.Alt | HotKey.KeyModifiers.Ctrl, (int)Keys.S);
                HotKey.RegisterHotKey(handle, 100, HotKey.KeyModifiers.Shift, (int)Keys.S);
    
                //获得消息源
                System.Windows.Interop.HwndSource source = System.Windows.Interop.HwndSource.FromHwnd(handle);
    
                source.AddHook(HotKeyHook);
            }
            static private IntPtr HotKeyHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
            //热键处理过程
            {
                const int WM_HOTKEY = 0x0312;//如果m.Msg的值为0x0312那么表示用户按下了热键
                if (msg == WM_HOTKEY)
                {
                    switch (wParam.ToInt32())
                    {
                        case 100:    //按下的是Shift+S
                            //此处填写快捷键响应代码
                            MessageBox.Show("按下的是Shift+S");
                            break;
                        case 101:    //按下的是Ctrl+B
                            //此处填写快捷键响应代码
                            break;
                        case 102:    //按下的是Ctrl+Alt+S
                            break;
                    }
                }
                return IntPtr.Zero;
            }

转载于:https://www.cnblogs.com/Martianhh/p/5445785.html