using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Reflection;
namespace HookDll
{
public class HookDll
{
private KBDLLHOOKSTRUCT kbdllhs;
private IntPtr iHookHandle =IntPtr.Zero;
private GCHandle _hookProcHandle;
public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern IntPtr SetWindowsHookEx(int hookid, HookProc pfnhook, IntPtr hinst, int threadid);
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
public static extern bool UnhookWindowsHookEx(IntPtr hhook);
[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true)]
public static extern IntPtr CallNextHookEx(IntPtr hhook, int code, IntPtr wparam, IntPtr lparam);
[DllImport("kernel32.dll",CharSet=CharSet.Auto, CallingConvention=CallingConvention.StdCall)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
[DllImport("Kernel32.dll",EntryPoint="RtlMoveMemory")]
public static extern void CopyMemory (ref KBDLLHOOKSTRUCT Source,IntPtr Destination,int Length);
private const int WH_KEYBOARD = 13;
public void DisableKBDHook()
{
try
{
if (iHookHandle!=IntPtr.Zero)
{
UnhookWindowsHookEx(iHookHandle);
}
_hookProcHandle.Free();
iHookHandle = IntPtr.Zero;
}
catch
{
return;
}
}
public void EnableKBDHook()
{
HookProc hookProc = new HookProc(KBDDelegate);
_hookProcHandle = GCHandle.Alloc(hookProc);
iHookHandle = SetWindowsHookEx(WH_KEYBOARD, hookProc, GetModuleHandle("HookDll.dll"), 0);
if (iHookHandle == IntPtr.Zero)
{
throw new System.Exception("錯誤,鉤子失敗!");
}
}
public IntPtr KBDDelegate(int iCode , IntPtr wParam,IntPtr lParam)
{
kbdllhs = new KBDLLHOOKSTRUCT();
CopyMemory(ref kbdllhs, lParam, 20);
//結果就在這裡了^_^
int iHookCode = kbdllhs.vkCode;
DisableKBDHook();
EnableKBDHook();
return CallNextHookEx(iHookHandle, iCode, wParam,lParam);
}
}
[StructLayout(LayoutKind.Sequential)]
public struct KBDLLHOOKSTRUCT
{
public int vkCode;
public int scanCode;
public int flags;
public int time;
public int dwExtraInfo;
}
}
