发送WIN+SAPCE键，WINDOWS,空格键

键盘代码部份转自：http://www.cnblogs.com/cpcpc/archive/2011/02/22/2123055.html

由于喜欢用CTRL+空格键切换输入法，在WIN8上有所不习惯，所以写了个小程序，当按CTRL+空格键时向系统发送WIN+空格键。

首先使用全局快捷键，监视CTRL+空格的输入,然后再发送WIN+空格键。

[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