如何正确解钩
本文关键字:何正确 | 更新日期: 2023-09-27 18:16:56
我做了一个非常简单的Hook代码(我是初学者)。
我打开记事本测试。
如果我按任意键,它会发出哔哔声并打印出来。
除"x"键外,为终止键。
问题:
我不想看到"x"键被打印出来。我刚退出这个项目。我该怎么做?
namespace HookingStudy
{
class HookingClass
{
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = hookCallBack;
private static IntPtr _hookID = IntPtr.Zero;
public static void Main()
{
Beep(1111, 222);
_hookID = SetHook(_proc);
Application.Run();
}
private static IntPtr hookCallBack(int nCode, IntPtr wParam, IntPtr lParam)
{
if( nCode >= 0 && wParam == (IntPtr) WM_KEYDOWN )
{
int vkCode = Marshal.ReadInt32(lParam);
if( vkCode.ToString() == "88" ) // 88 ("x" key)
{
Beep(7777, 222);
UnhookWindowsHookEx(_hookID);
Process.GetCurrentProcess().Kill();
}
Beep(2222, 55);
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
private static IntPtr SetHook(LowLevelKeyboardProc proc)
{
using( Process curProcess = Process.GetCurrentProcess() )
using( ProcessModule curModule = curProcess.MainModule )
{
return SetWindowsHookEx(13, proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("KERNEL32.DLL")]
extern public static void Beep(int freq, int dur);
[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.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
}
}
我不想在记事本
上看到终止符x
那么就不要调用next钩子:
return CallNextHookEx(_hookID, nCode, wParam, lParam);
把它挂接在现有处理程序之前安装自己的处理程序的想法(来自winapi的事务)。通过拦截(就像您已经在做的那样),您不仅可以监听,而且还可以使用该调用调用先前的处理程序。
试试(未测试):
if( vkCode == 88)
{
...
return 0;
}