Windows SendInput（键盘）无法断开连接

Question

我正在运行一个c＃应用程序，该应用程序利用windows中的sendinputs方法来模拟击键。当我远程登录到实例时，它工作正常，但是一旦我注销它就抛出异常。任何人都可以提出任何关于为什么会发生这种情况的想法，以及如何避免它？

UPDATE :: 这里有一些可以重现问题的示例代码。

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

namespace ConsoleApplication6
{
    class Program
    {

class SendKey
    {

        [StructLayout(LayoutKind.Sequential)]
        private struct MOUSEINPUT
        {
            public int dx;
            public int dy;
            public int mouseData;
            public int dwFlags;
            public int time;
            public int dwExtraInfo;
        };

        [StructLayout(LayoutKind.Sequential)]
        private struct KEYBDINPUT
        {
            public short wVk;
            public short wScan;
            public int dwFlags;
            public int time;
            public int dwExtraInfo;
        };

        [StructLayout(LayoutKind.Sequential)]
        private struct HARDWAREINPUT
        {
            public int uMsg;
            public short wParamL;
            public short wParamH;
        };

        [StructLayout(LayoutKind.Explicit)]
        private struct INPUT
        {
            [FieldOffset(0)]
            public int type;
            [FieldOffset(4)]
            public MOUSEINPUT no;
            [FieldOffset(4)]
            public KEYBDINPUT ki;
            [FieldOffset(4)]
            public HARDWAREINPUT hi;
        };

        [DllImport("user32.dll")]
        private extern static void SendInput(int nInputs, ref INPUT pInputs, int cbsize);
        [DllImport("user32.dll", EntryPoint = "MapVirtualKeyA")]
        private extern static int MapVirtualKey(int wCode, int wMapType);

        private const int INPUT_KEYBOARD = 1;
        private const int KEYEVENTF_KEYDOWN = 0x0;
        private const int KEYEVENTF_KEYUP = 0x2;
        private const int KEYEVENTF_EXTENDEDKEY = 0x1;

        private void Send(Keys key, bool isEXTEND)
        {

            INPUT inp = new INPUT();

            inp.type = INPUT_KEYBOARD;
            inp.ki.wVk = (short)key;
            inp.ki.wScan = (short)MapVirtualKey(inp.ki.wVk, 0);
            inp.ki.dwFlags = ((isEXTEND) ? (KEYEVENTF_EXTENDEDKEY) : 0x0) | KEYEVENTF_KEYDOWN;
            inp.ki.time = 0;
            inp.ki.dwExtraInfo = 0;
            SendInput(1, ref inp, Marshal.SizeOf(inp));

            System.Threading.Thread.Sleep(100);

            inp.ki.dwFlags = ((isEXTEND) ? (KEYEVENTF_EXTENDEDKEY) : 0x0) | KEYEVENTF_KEYUP;
            SendInput(1, ref inp, Marshal.SizeOf(inp));
        }

        static void Main()
        {
                while(true)
                {
                    System.Threading.Thread.Sleep(2000);
                    SendKey s = new SendKey();
                    s.Send(Keys.Z, false);
                    s.Send(Keys.Left, true);

                }

        }
    }

}
}

如果你构建这个并且只是在一个免费的Windows服务器ec2实例上运行它，并且记事本处于焦点，那么当你远程访问实例时它将连续打印zzzzzz，但是，只要你远离实例，它就会停止打印，直到您重新登录。