64 lines
2.5 KiB
C#
64 lines
2.5 KiB
C#
using System;
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using System.Diagnostics;
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using System.Windows.Forms;
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using System.Runtime.InteropServices;
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class KeyboardHook {
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private const int WH_KEYBOARD_LL = 13;
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private const int WM_KEYDOWN = 0x0104;
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private const int WM_KEYUP = 0x0101;
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private static LowLevelKeyboardProc _proc = HookCallback;
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private static IntPtr _hookID = IntPtr.Zero;
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public static int previousEvent = 0;
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public static event EventHandler<int> KeyDown;
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public static event EventHandler<int> KeyUp;
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public static void Start() {
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_hookID = SetHook(_proc);
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}
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public static void Stop() {
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UnhookWindowsHookEx(_hookID);
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}
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private static IntPtr SetHook(LowLevelKeyboardProc proc) {
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using (Process curProcess = Process.GetCurrentProcess()) using (ProcessModule curModule =
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curProcess.MainModule) {
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return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
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}
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}
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private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
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private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam) {
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if (nCode >= 0) {
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int vkCode = Marshal.ReadInt32(lParam);
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int pero = (int)wParam * 1000 + vkCode;
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if (pero != previousEvent) {
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if (wParam == (IntPtr)WM_KEYDOWN) {
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KeyDown?.Invoke(null, vkCode);
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} else if (wParam == (IntPtr)WM_KEYUP) {
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KeyUp?.Invoke(null, vkCode);
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}
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previousEvent = pero;
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} else {
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Console.WriteLine("Same event");
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}
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}
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return CallNextHookEx(_hookID, nCode, wParam, lParam);
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}
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[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
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[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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[return:MarshalAs(UnmanagedType.Bool)]
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private static extern bool UnhookWindowsHookEx(IntPtr hhk);
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[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
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[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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private static extern IntPtr GetModuleHandle(string lpModuleName);
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} |