HOOK in C#
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hook 键盘
using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace WinForm
{
public partial class tt : Form
{
public tt()
{
InitializeComponent();
}
internal enum HookType //枚举,钩子的类型
{
//MsgFilter = -1,
//JournalRecord = 0,
//JournalPlayback = 1,
Keyboard = 2,
//GetMessage = 3,
//CallWndProc = 4,
//CBT = 5,
//SysMsgFilter = 6,
//Mouse = 7,
//Hardware = 8,
//Debug = 9,
//Shell = 10,
//ForegroundIdle = 11,
//CallWndProcRet = 12,
//KeyboardLL = 13,
//MouseLL = 14,
};
IntPtr _nextHookPtr; //记录Hook编号
[DllImport("kernel32.dll")]
static extern int GetCurrentThreadId(); //取得当前线程编号的API
[DllImport("User32.dll")]
internal extern static void UnhookWindowsHookEx(IntPtr handle); //取消Hook的API
[DllImport("User32.dll")]
internal extern static IntPtr SetWindowsHookEx(int idHook, [MarshalAs(UnmanagedType.FunctionPtr)] HookProc lpfn, IntPtr hinstance, int threadID); //设置Hook的API
[DllImport("User32.dll")]
internal extern static IntPtr CallNextHookEx(IntPtr handle, int code, IntPtr wparam, IntPtr lparam); //取得下一个Hook的API
internal delegate IntPtr HookProc(int code, IntPtr wparam, IntPtr lparam);
IntPtr MyHookProc(int code, IntPtr wparam, IntPtr lparam)
{
//返回,让后面的程序处理该消息
if (code < 0)
{
return CallNextHookEx(_nextHookPtr, code, wparam, lparam);
}
if (wparam.ToInt32() == 13)
{
this.textBox1.Text = "a";
return (IntPtr)1; //直接返回了,该消息就处理结束了
}
else
{
return IntPtr.Zero; //返回,让后面的程序处理该消息
}
}
public void SetHook()
{
if (_nextHookPtr != IntPtr.Zero) //已经勾过了
return;
HookProc myhookProc = new HookProc(MyHookProc); //声明一个自己的Hook实现函数的委托对象
_nextHookPtr = SetWindowsHookEx((int)HookType.Keyboard, myhookProc, IntPtr.Zero, GetCurrentThreadId()); //加到Hook链中
}
public void UnHook()
{
if (_nextHookPtr != IntPtr.Zero)
{
UnhookWindowsHookEx(_nextHookPtr); //从Hook链中取消
_nextHookPtr = IntPtr.Zero;
}
}
private void Form1_Load(object sender, EventArgs e)
{
SetHook();
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
UnHook();
}
}
}
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