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.Hooks
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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 (Process curProcess = Process.GetCurrentProcess())
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using (ProcessModule 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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int vkCode = Marshal.ReadInt32(lParam);
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for (int 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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} |