73 lines
2.6 KiB
C#
73 lines
2.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Windows.Forms;
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namespace CC_Functions.W32
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{
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public sealed class KeyboardHook : IDisposable
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{
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public delegate void keyPress(KeyboardHookEventArgs _args);
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private const int WH_KEYBOARD_LL = 13;
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private const int WM_KEYDOWN = 0x0100;
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private static readonly List<KeyboardHook> instances = new List<KeyboardHook>();
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private static readonly LowLevelKeyboardProc _proc = HookCallback;
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private static IntPtr _hookID = IntPtr.Zero;
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public KeyboardHook()
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{
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if (instances.Count == 0)
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_hookID = SetHook(_proc);
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instances.Add(this);
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}
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public void Dispose()
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{
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instances.Remove(this);
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if (instances.Count == 0)
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UnhookWindowsHookEx(_hookID);
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}
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public event keyPress OnKeyPress;
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private IntPtr SetHook(LowLevelKeyboardProc proc)
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{
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using (var curProcess = Process.GetCurrentProcess())
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using (var curModule = curProcess.MainModule)
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{
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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 static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
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{
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if (nCode >= 0 && wParam == (IntPtr) WM_KEYDOWN)
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{
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var vkCode = Marshal.ReadInt32(lParam);
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for (var i = 0; i < instances.Count; i++)
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instances[i].OnKeyPress?.Invoke(new KeyboardHookEventArgs((Keys) vkCode));
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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,
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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.Unicode, SetLastError = true)]
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private static extern IntPtr GetModuleHandle(string lpModuleName);
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private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
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}
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} |