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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）~