用C#钩子写一个改键外挂

改键是一种习惯，比如在玩儿lol或者dota的时候。理论上玩儿什么游戏都可以改键。

做一个窗体（点击Install——应用改键，点击Uninstall——撤销应用）：

窗体定义代码如下：

 using System.Windows.Forms;  namespace KeysExchange {     partial class Form1     {         /// <summary>         /// Required designer variable.         /// </summary>         private System.ComponentModel.IContainer components = null;          /// <summary>         /// Clean up any resources being used.         /// </summary>         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>         protected override void Dispose(bool disposing)         {             if (disposing && (components != null))             {                 components.Dispose();             }             base.Dispose(disposing);         }          #region Windows Form Designer generated code          /// <summary>         /// Required method for Designer support - do not modify         /// the contents of this method with the code editor.         /// </summary>         private void InitializeComponent()         {             this.intall_button = new System.Windows.Forms.Button();             this.uninstall_button = new System.Windows.Forms.Button();             this.comboBox1 = new System.Windows.Forms.ComboBox();             this.comboBox2 = new System.Windows.Forms.ComboBox();             this.label1 = new System.Windows.Forms.Label();             this.SuspendLayout();             //              // intall_button             //              this.intall_button.Location = new System.Drawing.Point(179, 162);             this.intall_button.Name = "intall_button";             this.intall_button.Size = new System.Drawing.Size(75, 23);             this.intall_button.TabIndex = 4;             this.intall_button.Text = "Install";             this.intall_button.UseVisualStyleBackColor = true;             this.intall_button.Click += new System.EventHandler(this.intall_button_Click);             //              // uninstall_button             //              this.uninstall_button.Location = new System.Drawing.Point(179, 207);             this.uninstall_button.Name = "uninstall_button";             this.uninstall_button.Size = new System.Drawing.Size(75, 23);             this.uninstall_button.TabIndex = 5;             this.uninstall_button.Text = "Uninstall";             this.uninstall_button.UseVisualStyleBackColor = true;             this.uninstall_button.Click += new System.EventHandler(this.uninstall_button_Click);             //              // comboBox1             //              this.comboBox1.FormattingEnabled = true;             this.comboBox1.Location = new System.Drawing.Point(54, 41);             this.comboBox1.Name = "comboBox1";             this.comboBox1.Size = new System.Drawing.Size(57, 21);             this.comboBox1.TabIndex = 6;             this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;             //              // comboBox2             //              this.comboBox2.FormattingEnabled = true;             this.comboBox2.Location = new System.Drawing.Point(175, 41);             this.comboBox2.Name = "comboBox2";             this.comboBox2.Size = new System.Drawing.Size(57, 21);             this.comboBox2.TabIndex = 7;             this.comboBox2.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;             //              // label1             //              this.label1.AutoSize = true;             this.label1.Location = new System.Drawing.Point(126, 44);             this.label1.Name = "label1";             this.label1.Size = new System.Drawing.Size(43, 13);             this.label1.TabIndex = 8;             this.label1.Text = "改为：";             //              // Form1             //              this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;             this.ClientSize = new System.Drawing.Size(301, 273);             this.Controls.Add(this.label1);             this.Controls.Add(this.comboBox2);             this.Controls.Add(this.comboBox1);             this.Controls.Add(this.uninstall_button);             this.Controls.Add(this.intall_button);             this.Name = "Form1";             this.Text = "KeysExchange";             this.ResumeLayout(false);             this.PerformLayout();         }          #endregion         private System.Windows.Forms.Button intall_button;         private System.Windows.Forms.Button uninstall_button;         private System.Windows.Forms.ComboBox comboBox1;         private System.Windows.Forms.ComboBox comboBox2;         private System.Windows.Forms.Label label1;     }      struct ComboItem     {         private string text;         private string value;          public ComboItem(string text, string value)         {             this.text = text;             this.value = value;         }          public override string ToString()         {             return this.text;         }          public string ToValue()         {             return this.value;         }     } } 

钩子代码如下：

 using System; using System.Diagnostics; using System.Runtime.InteropServices;  namespace KeysExchange {     public class KeyboardHookLib     {         private const int WH_KEYBOARD_LL = 13;               private delegate int HookHandle(int nCode, int wParam, IntPtr lParam);         public delegate void ProcessKeyHandle(HookStruct param, out bool handle);         private static int _hHookValue = 0;         private HookHandle _KeyBoardHookProcedure;         [StructLayout(LayoutKind.Sequential)]         public class HookStruct         {             public int vkCode;             public int scanCode;             public int flags;             public int time;             public int dwExtraInfo;         }         [DllImport("user32.dll")]         private static extern int SetWindowsHookEx(int idHook, HookHandle lpfn, IntPtr hInstance, int threadId);         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]         private static extern bool UnhookWindowsHookEx(int idHook);         [DllImport("user32.dll")]         private static extern int CallNextHookEx(int idHook, int nCode, int wParam, IntPtr lParam);         [DllImport("kernel32.dll")]         private static extern int GetCurrentThreadId();         [DllImport("kernel32.dll")]         private static extern IntPtr GetModuleHandle(string name);         private IntPtr _hookWindowPtr = IntPtr.Zero;         public KeyboardHookLib() { }         private static ProcessKeyHandle _clientMethod = null;         [DllImport("user32")]         public static extern int GetKeyboardState(byte[] pbKeyState);         [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]         private static extern short GetKeyState(int vKey);         private const int WM_KEYDOWN = 0x100;//KEYDOWN         private const int WM_KEYUP = 0x101;//KEYUP         private const int WM_SYSKEYDOWN = 0x104;//SYSKEYDOWN         private const int WM_SYSKEYUP = 0x105;//SYSKEYUP          public void InstallHook(ProcessKeyHandle clientMethod)         {             _clientMethod = clientMethod;             if (_hHookValue == 0)             {                 _KeyBoardHookProcedure = new HookHandle(OnHookProc);                 _hookWindowPtr = GetModuleHandle(Process.GetCurrentProcess().MainModule.ModuleName);                 _hHookValue = SetWindowsHookEx(WH_KEYBOARD_LL, _KeyBoardHookProcedure, _hookWindowPtr, 0);                 if (_hHookValue == 0) UninstallHook();             }         }          public void UninstallHook()         {             if (_hHookValue != 0)             {                 if (UnhookWindowsHookEx(_hHookValue))                 {                     _hHookValue = 0;                 }             }         }          private static int OnHookProc(int nCode, int wParam, IntPtr lParam)         {             if (nCode >= 0)             {                 HookStruct hookStruct = (HookStruct)Marshal.PtrToStructure(lParam, typeof(HookStruct));                 if (_clientMethod != null)                 {                     bool handle = false;                     ///Tylan: Judge if the event is KeyDown or not.                     if (lParam.ToInt32() > 0 && wParam == 0x100)                     {                         _clientMethod(hookStruct, out handle);                     }                     if (handle) return 1;                  }             }             return CallNextHookEx(_hHookValue, nCode, wParam, lParam);         }     } } 

逻辑部分代码如下：

 using System; using System.Windows.Forms;  namespace KeysExchange {     public partial class Form1 : Form     {         private KeyboardHookLib _keyboardHook = null;          public Form1()         {             InitializeComponent();             for (int alp = 65; alp <= 90; alp++)             {                 ComboItem item = new ComboItem(((Keys)alp).ToString(), alp.ToString());                 comboBox1.Items.Add(item);                 comboBox2.Items.Add(item);             }         }          private void intall_button_Click(object sender, EventArgs e)         {             //Install the hook.             _keyboardHook = new KeyboardHookLib();             _keyboardHook.InstallHook(this.OnKeyPress);         }          private void uninstall_button_Click(object sender, EventArgs e)         {             //Cancel the hook.             if (_keyboardHook != null) _keyboardHook.UninstallHook();         }          public void OnKeyPress(KeyboardHookLib.HookStruct hookStruct, out bool handle)         {             handle = false;             if (((Keys)hookStruct.vkCode).ToString() == comboBox1.SelectedItem.ToString())              {                 handle = true;                 //Exchange the keys.                 hookStruct.vkCode = int.Parse(((ComboItem)comboBox2.SelectedItem).ToValue());                 Keys key = (Keys)hookStruct.vkCode;                 //MessageBox.Show((key == Keys.None ? "" : key.ToString()));                 System.Windows.Forms.SendKeys.Send(key.ToString().ToLower());             }         }     } } 

F5运行，找个游戏试一下，改键成功啦（按p成功打开背包）~