[DllImport("user32.dll", SetLastError = true)]

        public static extern bool RegisterHotKey(IntPtr hWnd, // handle to window

         int id,            // hot key identifier

         KeyModifiers fsModifiers,  // key-modifier options

         Keys vk            // virtual-key code

         );

        [DllImport("user32.dll", SetLastError = true)]

        public static extern bool UnregisterHotKey(IntPtr hWnd,  // handle to window

         int id      // hot key identifier

         );

        [Flags()]

        public enum KeyModifiers

        {

            None = ,

            Alt = ,

            Control = ,

            Shift = ,

            Windows =

        }

/// <summary>

        /// 切换输入法

        /// </summary>

        const int hotKeyId_SwitchIME = ;

/// <summary>

        /// 发送WIN+空格

        /// </summary>

        /// <param name="bVk"></param>

        /// <param name="bScan"></param>

        /// <param name="dwFlags"></param>

        /// <param name="dwExtraInfo"></param>

        [DllImport("user32.dll")]

        private static extern void keybd_event(byte bVk, byte bScan, long dwFlags, long dwExtraInfo);

//在Form1_Shown时注册快捷键

private void Form1_Shown(object sender, EventArgs e)

        {

Version win7ver = new Version("6.1.9999.9999");

                if (Environment.OSVersion.Version.CompareTo(win7ver) > )

                {

                    //ctrl+空格切换输入法

              bool       bSucc = RegisterHotKey(Handle, hotKeyId_SwitchIME, KeyModifiers.Control, Keys.Space);

                }

}

//发送WIN+空格

 protected override void WndProc(ref Message m)

        {

            try

            {

                //固定的热键消息 0x0312

                const int WM_HOTKEY = 0x0312;

                switch (m.Msg)

                {

                    case WM_HOTKEY:

                        #region 判断哪个功能

                        switch (m.WParam.ToInt32())

                        {

                            case hotKeyId_SwitchIME:

                                const byte VK_LWIN = 0x5B;

                                const byte VK_space = 0x20;

                                const byte KEYEVENTF_KEYUP = 0x2;

                                const byte KEYEVENTF_EXTENDEDKEY = 0x1;

                                keybd_event(VK_LWIN, , KEYEVENTF_EXTENDEDKEY, );

                                keybd_event(VK_space, , KEYEVENTF_EXTENDEDKEY, );

                                keybd_event(VK_space, , KEYEVENTF_KEYUP, );

                                keybd_event(VK_LWIN, , KEYEVENTF_KEYUP, );

                                break;

                        }

                        #endregion

                        break;

                }

                base.WndProc(ref m);

            }

            catch { }

        }

private void Form1_FormClosing(object sender, FormClosingEventArgs e)

        {

            //关闭时解除注册

            UnregisterHotKey(Handle, hotKeyId_SwitchIME);

        }

可在代码中的任何地方用下列值代替键盘上的键：

值 描述

0x1 鼠标左键

0x2 鼠标右键

0x3 CANCEL 键

0x4 鼠标中键

0x8 BACKSPACE 键

0x9 TAB 键

0xC CLEAR 键

0xD ENTER 键

0x10 SHIFT 键

0x11 CTRL 键

0x12 MENU 键

0x13 PAUSE 键

0x14 CAPS LOCK 键

0x1B ESC 键

0x20 SPACEBAR 键

0x21 PAGE UP 键

0x22 PAGE DOWN 键

0x23 END 键

0x24 HOME 键

0x25 LEFT ARROW 键

0x26 UP ARROW 键

0x27 RIGHT ARROW 键

0x28 DOWN ARROW 键

0x29 SELECT 键

0x2A PRINT SCREEN 键

0x2B EXECUTE 键

0x2C SNAPSHOT 键

0x2D INSERT 键

0x2E DELETE 键

0x2F HELP 键

0x90 NUM LOCK 键

A 至 Z 键与 A - Z 字母的 ASCII 码相同：

值 描述

 A 键

 B 键

 C 键

 D 键

 E 键

 F 键

 G 键

 H 键

 I 键

 J 键

 K 键

 L 键

 M 键

 N 键

 O 键

 P 键

 Q 键

 R 键

 S 键

 T 键

 U 键

 V 键

 W 键

 X 键

 Y 键

 Z 键

 至  键与数字  -  的 ASCII 码相同：

值 描述

  键

  键

  键

  键

  键

  键

  键

  键

  键

  键

下列常数代表数字键盘上的键：

值 描述

0x60  键

0x61  键

0x62  键

0x63  键

0x64  键

0x65  键

0x66  键

0x67  键

0x68  键

0x69  键

0x6A MULTIPLICATION SIGN (*) 键

0x6B PLUS SIGN (+) 键

0x6C ENTER 键

0x6D MINUS SIGN (-) 键

0x6E DECIMAL POINT (.) 键

0x6F DIVISION SIGN (/) 键

下列常数代表功能键：

值 描述

0x70 F1 键

0x71 F2 键

0x72 F3 键

0x73 F4 键

0x74 F5 键

0x75 F6 键

0x76 F7 键

0x77 F8 键

0x78 F9 键

0x79 F10 键

0x7A F11 键

0x7B F12 键

0x7C F13 键

0x7D F14 键

0x7E F15 键

0x7F F16 键