C#控制键盘大小写切换

        #region 键盘大小写控制
        const uint KEYEVENTF_EXTENDEDKEY = 0x1;
        const uint KEYEVENTF_KEYUP = 0x2;

        [DllImport("user32.dll")]
        static extern short GetKeyState(int nVirtKey);
        [DllImport("user32.dll")]
        static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, uint dwExtraInfo);

        public enum VirtualKeys : byte
        {
            VK_NUMLOCK = 0x90, //数字锁定键
            VK_SCROLL = 0x91,  //滚动锁定
            VK_CAPITAL = 0x14, //大小写锁定
            VK_A = 62
        }

        public static bool GetState(VirtualKeys Key)
        {
            return (GetKeyState((int)Key) == 1);
        }
        public static void SetState(VirtualKeys Key, bool State)
        {
            if (State != GetState(Key))
            {
                keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | 0, 0);
                keybd_event((byte)Key, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
            }
        }

        //开启键盘大写
        private void btnOpenCAPITAL_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_CAPITAL, true);
        }

        //关闭键盘大写
        private void btnCloseCAPITAL_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_CAPITAL, false);
        }

        //开启键盘滚动锁定
        private void btnOpenScroll_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_SCROLL, true);
        }

        //关闭键盘滚动锁定
        private void btnCloseScroll_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_SCROLL, false);
        }

        //开启键盘数字锁定键
        private void btnOpenNum_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_NUMLOCK, true);
        }

        //关闭键盘数字锁定键
        private void btnCloseNum_Click(object sender, EventArgs e)
        {
            SetState(VirtualKeys.VK_NUMLOCK, false);
        }
        #endregion 键盘大小写控制