c# - 计算屏幕上的按键次数

Question

如何计算 C# 应用程序中在整个屏幕上按下的总键数？就像应用程序在后面运行并且我正在打字一样......然后我可以看到我按下了多少个键。谢谢你。

Answer 1

在MSDN 博客上找到：

成立：

   static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            _hookID = SetHook(_proc);

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
            UnhookWindowsHookEx(_hookID);

        }

        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private static LowLevelKeyboardProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;


        private static IntPtr SetHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
                    GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private delegate IntPtr LowLevelKeyboardProc(
            int nCode, IntPtr wParam, IntPtr lParam);

        private static IntPtr HookCallback(
            int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                Console.WriteLine((Keys)vkCode);
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook,
            LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
            IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
    }

Answer 2

我会解决您的应用程序运行落后的原因（将代码移动到后台工作人员？）

如果您在这样做之后仍然想要全局 keypresscount，请查看这个在 C# 中挂钩 keypress 应用程序范围的演示项目

http://www.codeproject.com/Articles/19004/A-Simple-C-Global-Low-Level-Keyboard-Hook

Answer 3

在此处下载演示项目表格：

键盘记录器项目

并根据需要进行自定义更改。

Answer 4

也许它会给你一些想法：

private void OnKeyDownHandler(object sender, KeyEventArgs e)
{
  if (e.Key == Key.Return)
  {
     textBlock1.Text = "You Entered: " + textBox1.Text;
  }
}

Answer 5

我使用如下所示的ProcessKeyEventArgs来捕获Print Screen我的 C# Windows 窗体中的按键。

我所做的修改就是添加一个计数器并增加它。

private long counter = 0;

protected override bool ProcessKeyEventArgs(ref Message msg) {
  counter++;
  return base.ProcessKeyEventArgs(ref msg);
}