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CC-Functions/W32/Hooks/KeyboardHook.cs

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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
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using System.Windows.Forms;
using CC_Functions.W32.Native;
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namespace CC_Functions.W32.Hooks
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{
public sealed class KeyboardHook : IDisposable
{
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public delegate void KeyPress(KeyboardHookEventArgs args);
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private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
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private static readonly List<KeyboardHook> Instances = new List<KeyboardHook>();
private static readonly user32.LowLevelProc Proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
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public KeyboardHook()
{
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if (Instances.Count == 0)
_hookID = SetHook(Proc);
Instances.Add(this);
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}
public void Dispose()
{
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Instances.Remove(this);
if (Instances.Count == 0)
user32.UnhookWindowsHookEx(_hookID);
}
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public event KeyPress? OnKeyPress;
private IntPtr SetHook(user32.LowLevelProc proc)
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{
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using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
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{
return user32.SetWindowsHookEx(WH_KEYBOARD_LL, proc, kernel32.GetModuleHandle(curModule.ModuleName), 0);
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}
}
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr) WM_KEYDOWN)
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{
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int vkCode = Marshal.ReadInt32(lParam);
for (int i = 0; i < Instances.Count; i++)
Instances[i].OnKeyPress?.Invoke(new KeyboardHookEventArgs((Keys) vkCode));
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}
return user32.CallNextHookEx(_hookID, nCode, wParam, lParam);
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}
}
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}