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GlobalEvents.cs
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GlobalEvents.cs
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using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace ClickThrough
{
public class GlobalEvents
{
private const int WH_KEYBOARD_LL = 13;
private const int WH_MOUSE_LL = 14;
private const int WM_KEYDOWN = 0x0100;
private const int WM_KEYUP = 0x0101;
private const int WM_MOUSEMOVE = 0x0200;
private const int VK_SHIFT = 0x10;
private const int VK_CONTROL = 0x11;
private const int VK_MENU = 0x12;
private const int VK_CAPITAL = 0x14;
private IntPtr _keyboardHook;
private IntPtr _mouseHook;
public GlobalKeyEvent OnKeyDown;
public GlobalKeyEvent OnKeyUp;
public GlobalMouseEvent OnMouseMove;
public void Listen()
{
_keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardCallback, GetModuleHandle("user32.dll"), 0);
_mouseHook = SetWindowsHookEx(WH_MOUSE_LL, MouseCallback, GetModuleHandle("user32.dll"), 0);
}
public void Stop()
{
UnhookWindowsHookEx(_keyboardHook);
UnhookWindowsHookEx(_mouseHook);
_keyboardHook = IntPtr.Zero;
_mouseHook = IntPtr.Zero;
}
private IntPtr KeyboardCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
var vkCode = (Keys) Marshal.ReadInt32(lParam);
vkCode = AddModifiers(vkCode);
if (wParam == (IntPtr) WM_KEYDOWN)
{
OnKeyDown?.Invoke(vkCode);
}
if (wParam == (IntPtr) WM_KEYUP)
{
OnKeyUp?.Invoke(vkCode);
}
}
return CallNextHookEx(_keyboardHook, nCode, wParam, lParam);
}
private IntPtr MouseCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr) WM_MOUSEMOVE)
{
int x = Cursor.Position.X;
int y = Cursor.Position.Y;
OnMouseMove?.Invoke(x, y);
}
return CallNextHookEx(_mouseHook, nCode, wParam, lParam);
}
private static Keys AddModifiers(Keys key)
{
if ((GetKeyState(VK_CAPITAL) & 0x0001) != 0)
key |= Keys.CapsLock;
if ((GetKeyState(VK_SHIFT) & 0x8000) != 0)
key |= Keys.Shift;
if ((GetKeyState(VK_CONTROL) & 0x8000) != 0)
key |= Keys.Control;
if ((GetKeyState(VK_MENU) & 0x8000) != 0)
key |= Keys.Alt;
return key;
}
[DllImport("kernel32.dll")]
private static extern IntPtr GetModuleHandle(string lpModuleName);
[DllImport("user32.dll")]
private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelProc lpfn, IntPtr hmod, uint dwThread);
[DllImport("user32.dll")]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll")]
private static extern short GetKeyState(int vkCode);
private delegate IntPtr LowLevelProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void GlobalKeyEvent(Keys key);
public delegate void GlobalMouseEvent(int x, int y);
}
}