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CC-Functions/W32/Hooks/KeyboardHook.cs
CreepyCrafter24 53a9bc5fe0 Rider+Fix
2019-12-22 16:58:16 +01:00

73 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.Hooks
{
public sealed class KeyboardHook : IDisposable
{
public delegate void KeyPress(KeyboardHookEventArgs args);
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static readonly List<KeyboardHook> Instances = new List<KeyboardHook>();
private static readonly LowLevelKeyboardProc Proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
public KeyboardHook()
{
if (Instances.Count == 0)
_hookID = SetHook(Proc);
Instances.Add(this);
}
public void Dispose()
{
Instances.Remove(this);
if (Instances.Count == 0)
UnhookWindowsHookEx(_hookID);
}
public event KeyPress OnKeyPress;
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 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);
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
}
}