C#键盘钩子拦截键盘按键

C#键盘钩子，本文以C#语言为例，演示拦截键盘按键。首先打开VS创建一个窗体应用程序。如图：

需要引入以下两个命名空间。

using System.Runtime.InteropServices;

using System.Diagnostics;

以下是全部源码：

using System;

using System.Collections.Generic;

using ponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Runtime.InteropServices;

using System.Diagnostics;

namespace WindowsForms5107

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

//定¨义?一?个?结á构1

public struct HookStruck

{

public int vkCode;

public int scanCode;

public int time;

}

public delegate int FunctionAddr(int ncode,IntPtr wParam,IntPtr iparam);

[DllImport("user32.dll")]

//参?数簓介é绍Θ?：阰hookID表括?示?参?数簓类え?型í，?有瓺鼠酣?标括?钩3子哩?，?键ü盘ì钩3子哩?等台?类え?型í，?callfunction：阰回?调獭?函ˉ数簓地?址·，?即′你?要癮转羇而?执′行D的?程ì序î地?址·。￡

//hInstance:钩3子哩?程ì序î的?实害??柄括?。￡threadID线?程ìId,你?要癮监à视酣?的?程ì序î的?iD,当獭纈d=0时骸?，?为a系μ统?钩3子哩?，?监à控?整?个?系μ统?

private static extern int SetWindowsHookEx(int hookID,FunctionAddr callFunction,IntPtr hInstance,int threadId);

[DllImport("kernel32.dll")]

//获?取?应畖用?程ì序î句?柄括?

private static extern IntPtr GetModuleHandle(string name);

[DllImport("user32.dll")]

//钩3子哩?卸?载?

private static extern bool UnhookWindowsHookEx(IntPtr hWnd);

private void button1_Click(object sender, EventArgs e)

{

this.InstaHook();

}

IntPtr _hookWindowPtr = IntPtr.Zero;

private void InstaHook()

{

FunctionAddr callbac = new FunctionAddr(CallBackFunction);

string modname = Process.GetCurrentProcess().MainModule.ModuleName;

int WH_HOOKid = 13;

_hookWindowPtr = (IntPtr)GetModuleHandle(modname);

IntPtr hookvalue =

(IntPtr)SetWindowsHookEx(WH_HOOKid,callbac,_hookWindowPtr,0);

}

private int CallBackFunction(int ncode,IntPtr wParam,IntPtr iparam)

{

HookStruck hookstruck = (HookStruck)Marshal.PtrToStructure(iparam,typeof(HookStruck));

//注痢?意癮65,90分?别纄是?A，?Z的?ASCII码?，?即′当獭?检ì测a按恪?下?A-Z时骸?，?执′行D拦?截?操ù作痢?

if(hookstruck.vkCode>=65&&hookstruck.vkCode<=122)

{

this.textBox1.Text = "按恪?键ü" + (char)hookstruck.vkCode + "已?拦?截?";

}

return 0;

}

private void button2_Click(object sender, EventArgs e)

{

//钩3子哩?卸?载?

bool result = true;

IntPtr hooxUn = (IntPtr)GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);

if (hooxUn != IntPtr.Zero)

{

result = (UnhookWindowsHookEx(_hookWindowPtr)&&result);