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CC-Functions/W32/Hooks/KeyboardHook.cs
2019-11-29 21:27:24 +01:00

72 lines
2.6 KiB
C#

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace CC_Functions.W32
{
public sealed class KeyboardHook : IDisposable
{
public void Dispose()
{
instances.Remove(this);
if (instances.Count == 0)
UnhookWindowsHookEx(_hookID);
}
private static List<KeyboardHook> instances = new List<KeyboardHook>();
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public delegate void keyPress(KeyboardHookEventArgs _args);
public event keyPress OnKeyPress;
public KeyboardHook()
{
if (instances.Count == 0)
_hookID = SetHook(_proc);
instances.Add(this);
}
private 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);
for (int i = 0; i < instances.Count; i++)
{
instances[i].OnKeyPress?.Invoke(new KeyboardHookEventArgs((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.Unicode, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
}
}