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#region
using System;
using System.ComponentModel;
using System.Drawing;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Forms;
#endregion
namespace GlobalHook
{
public class UserActivityHook
{
private const int VmRButton = 0x02;
private const int VkLControl = 0xA2;
private const int VkRControl = 0xA3;
private const int VkControl = 0x11;
private const int VkSnapshot = 0x2C;
private const int WhKeyboardLl = 13;
private const int WhMouseLl = 14;
private const int WmKeydown = 0x0100;
private const int WmMousedown =0x0201;
private static IntPtr kbh_Handle;
private static IntPtr kbh_Handle1;
private static HookProc KeyboardHookProcedure;
private static HookProc MouseHookProcedure;
private int HMouseHook;
private int HKeyboardHook;
#region Windows Function Imports
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hMod, int dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
public static extern int CallNextHookEx(IntPtr hhk, int nCode, int wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall,
SetLastError = true)]
private static extern int UnhookWindowsHookEx(int idHook);
private delegate int HookProc(int nCode, int wParam, IntPtr lParam);
#endregion
#region Windows constants
#endregion
~UserActivityHook()
{
//uninstall hooks and do not throw exceptions
Stop(true, true, false);
}
public void Start()
{
if (HMouseHook == 0)
{
// Create an instance of HookProc.
MouseHookProcedure = new HookProc(LowLevelMouseProc);
//install hook
HMouseHook = SetWindowsHookEx(WhMouseLl, MouseHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
//If SetWindowsHookEx fails.
if (HMouseHook== 0)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//do cleanup
Stop(true, false, false);
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
// install Keyboard hook only if it is not installed and must be installed
if (HKeyboardHook == 0)
{
// Create an instance of HookProc.
KeyboardHookProcedure = new HookProc(LowLevelKeyboardProc);
//install hook
HKeyboardHook = SetWindowsHookEx(WhKeyboardLl, KeyboardHookProcedure,
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]),
0);
//If SetWindowsHookEx fails.
if (HKeyboardHook == 0)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//do cleanup
Stop(false, true, false);
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}
public void Stop()
{
Stop(true, true, true);
}
public void Stop(bool uninstallMouseHook, bool uninstallKeyboardHook, bool throwExceptions)
{
if (HMouseHook != 0 && uninstallMouseHook)
{
//uninstall hook
int retMouse = UnhookWindowsHookEx(HMouseHook);
//reset invalid handle
HMouseHook = 0;
//if failed and exception must be thrown
if (retMouse == 0 && throwExceptions)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
//if keyboard hook set and must be uninstalled
if (HKeyboardHook != 0 && uninstallKeyboardHook)
{
//uninstall hook
int retKeyboard = UnhookWindowsHookEx(HKeyboardHook);
//reset invalid handle
HKeyboardHook = 0;
//if failed and exception must be thrown
if (retKeyboard == 0 && throwExceptions)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}
private static int LowLevelKeyboardProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode < 0)
{
CallNextHookEx(kbh_Handle, nCode, wParam, lParam);
return 0;
}
if (wParam == WmKeydown)
{
IntPtr kbdll = lParam;
Kbdllhookstruct kbdllstruct = (Kbdllhookstruct) Marshal.PtrToStructure(kbdll, typeof (Kbdllhookstruct));
if ((kbdllstruct.VkCode == VkSnapshot) || (kbdllstruct.VkCode == VkControl) || (kbdllstruct.VkCode == VkLControl) || (kbdllstruct.VkCode == VkRControl))
return -1;
}
return CallNextHookEx(kbh_Handle, nCode, wParam, lParam);
}
private static int LowLevelMouseProc(int nCode, int wParam, IntPtr lParam)
{
if (nCode < 0)
{
CallNextHookEx(kbh_Handle1, nCode, wParam, lParam);
return 0;
}
if (wParam == WmMousedown)
{
IntPtr msdll = lParam;
MouseLlHookStruct msdllstruct = (MouseLlHookStruct)Marshal.PtrToStructure(msdll, typeof(MouseLlHookStruct));
if (msdllstruct.MouseData == VmRButton)
return -1;
}
return CallNextHookEx(kbh_Handle1, nCode, wParam, lParam);
}
[StructLayout(LayoutKind.Sequential)]
private struct Point
{
public int X;
public int Y;
}
[StructLayout(LayoutKind.Sequential)]
private struct MouseLlHookStruct
{
public Point Point;
public int MouseData;
public int Flags;
public int Time;
public int ExtraInfo;
}
#region Nested type: Kbdllhookstruct
[StructLayout(LayoutKind.Sequential)]
public struct Kbdllhookstruct
{
public int VkCode;
public int ScanCode;
public int Flags;
public int Time;
public int ExtraInfo;
}
#endregion
}
} |
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