调试易

Shift  + 
 
Ctrl  ^ 
 
Alt  % 
 

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Focus();
            SendKeys.Send("+a");
        }

http://www.cnblogs.com/thunderdanky/articles/846890.html

To the 1st floor and the 2nd floor:
It's the sendinput function in win32 Api, Not the send function in the framework class sendkeys.

        [DllImport("user32.dll")]
        public static extern UInt32 SendInput(UInt32 nInputs, INPUT[] pInputs, int cbSize);
        [DllImport("kernel32.dll")]
        public static extern int GetTickCount();
        [StructLayout(LayoutKind.Explicit)]
        public struct INPUT
        {
            [FieldOffset(0)]
            public Int32 type;
            [FieldOffset(4)]
            public KEYBDINPUT ki;
            [FieldOffset(4)]
            public MOUSEINPUT mi;
            [FieldOffset(4)]
            public HARDWAREINPUT hi;
        }        [StructLayout(LayoutKind.Sequential)]
        public struct MOUSEINPUT
        {
            public Int32 dx;
            public Int32 dy;
            public Int32 mouseData;
            public Int32 dwFlags;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct KEYBDINPUT
        {
            public Int16 wVk;
            public Int16 wScan;
            public Int32 dwFlags;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }
        [StructLayout(LayoutKind.Sequential)]
        public struct HARDWAREINPUT
        {
            public Int32 uMsg;
            public Int16 wParamL;
            public Int16 wParamH;
        }        public const int INPUT_KEYBOARD = 1;
        public const int KEYEVENTF_KEYUP = 0x0002;        private void button1_Click(object sender, EventArgs e)
        {
            INPUT[] inDown = new INPUT[4];            inDown[0] = new INPUT();
            inDown[1] = new INPUT();
            inDown[2] = new INPUT();
            inDown[3] = new INPUT();            inDown[0].type = inDown[1].type = inDown[2].type = inDown[3].type = INPUT_KEYBOARD;
            inDown[0].ki.wVk = inDown[2].ki.wVk =(int) Keys.LWin;
            inDown[1].ki.wVk = inDown[3].ki.wVk = (int)Keys.R;            inDown[2].ki.dwFlags = inDown[3].ki.dwFlags = KEYEVENTF_KEYUP;            SendInput(4, inDown, Marshal.SizeOf(inDown[0]));
        }

还有一个问题，用上面的方法我发现Ctrl、Alt和Win键都不能弹起，弹起的那个怎么设都没用是怎么回事？

再问，sendinput发送Alt键的弹起操作不起作用是怎么回事，程序关了那个键还是按下状态，必须手动按一下键盘上的Alt键才行，怎么解决？急~~

也就是你只发了按下键的消息，而没发keyup的消息

To: ZengHD下面是测试代码        private void button1_Click_1(object sender, EventArgs e)
        {
            INPUT[] inDow = new INPUT[4];
            int i = 0;            while (i < inDow.Length)
            {
                inDow[i] = new INPUT();
                inDow[i++].type = INPUT_KEYBOARD;
            }            inDow[0].ki.wVk = inDow[3].ki.wVk = (int)Keys.LMenu;
            inDow[1].ki.wVk = inDow[2].ki.wVk = (int)Keys.E;
            inDow[2].ki.dwFlags = inDow[3].ki.dwFlags = KEYEVENTF_KEYUP;            this.Text = API.SendInput(6,inDow, Marshal.SizeOf(inDow[0])).ToString();        }Form上有个文本框，对窗口定义了一个事件的响应，如果按下Alt+E组合键的话，文本框的Text="menu"，这点是成功了，但是关闭程序以后发现Alt一直没弹起，也就是inDow[3]这个发送过去但是没起作用，但是发送成功了，因为Form的Text显示了4。
怎么测试出没有弹出呢
关闭程序以后很多鼠标操作都变了，比如双击桌面的程序快捷方式打不开程序，而是打开快捷方式的属性，直到我手动按一下键盘上的LMenu键才恢复正常。
是什么原因，该如何解决，希望帮助解答，给你加分，谢谢！

this.Text = API.SendInput(4,inDow, Marshal.SizeOf(inDow[0])).ToString();
第一个参数

UINT SendInput(
  UINT nInputs,     // count of input events
  LPINPUT pInputs,  // array of input events
  int cbSize        // size of structure
);第一个参数应该是按键的次数
我测试过修改为4后就没有问题了睡觉

发现问题了，我原来把
        [StructLayout(LayoutKind.Sequential)]
        public struct KEYBDINPUT
        {
            public Int16 wVk;
            public Int16 wScan;
            public Int32 dwFlags;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }
给定义成下面这样了，浪费了一天时间，郁闷
        [StructLayout(LayoutKind.Sequential)]
        public struct KEYBDINPUT
        {
            public int wVk;
            public int wScan;
            public Int32 dwFlags;
            public Int32 time;
            public IntPtr dwExtraInfo;
        }