Change keystroke to C #

Question

Hey, I'm trying to write a program in C # that will track the pressing of certain keys (using the keyboard hook) and send different ones instead.

For example, when I press the A key, it sends a Q-key instead.

I used http://www.codeproject.com/KB/cs/CSLLKeyboardHook.aspx for my hooks and tried to use the SendKeys function, but I get an exception from the garbage collector that destroys some objects inside the hook class.

Answer 1

First you need to connect the keys.

With this class you can register a global shortcut, I will skip the explanation, but you can read it here .

public class KeyboardHook { [DllImport("user32.dll")] private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk); [DllImport("user32.dll")] private static extern bool UnregisterHotKey(IntPtr hWnd, int id); public enum Modifiers { None = 0x0000, Alt = 0x0001, Control = 0x0002, Shift = 0x0004, Win = 0x0008 } int modifier; int key; IntPtr hWnd; int id; public KeyboardHook(int modifiers, Keys key, Form f) { this.modifier = modifiers; this.key = (int)key; this.hWnd = f.Handle; id = this.GetHashCode(); } public override int GetHashCode() { return modifier ^ key ^ hWnd.ToInt32(); } public bool Register() { return RegisterHotKey(hWnd, id, modifier, key); } public bool Unregister() { return UnregisterHotKey(hWnd, id); } } 

Then in your form you need to register a shortcut

 public partial class Form1 : Form { public Form1() { InitializeComponent(); KeyboardHook hook = new KeyboardHook((int)KeyboardHook.Modifiers.None, Keys.A, this); hook.Register(); // registering globally that A will call a method } protected override void WndProc(ref Message m) { if (m.Msg == 0x0312) HandleHotkey(); // A, which was registered before, was pressed base.WndProc(ref m); } private void HandleHotkey() { // instead of A send Q KeyboardManager.PressKey(Keys.Q); } } 

And here is the class for managing Keyboard click and release events.

 public class KeyboardManager { public const int INPUT_KEYBOARD = 1; public const int KEYEVENTF_KEYUP = 0x0002; public struct KEYDBINPUT { public Int16 wVk; public Int16 wScan; public Int32 dwFlags; public Int32 time; public Int32 dwExtraInfo; public Int32 __filler1; public Int32 __filler2; } public struct INPUT { public Int32 type; public KEYDBINPUT ki; } [DllImport("user32")] public static extern int SendInput(int cInputs, ref INPUT pInputs, int cbSize); public static void HoldKey(Keys vk) { INPUT input = new INPUT(); input.type = INPUT_KEYBOARD; input.ki.dwFlags = 0; input.ki.wVk = (Int16)vk; SendInput(1, ref input, Marshal.SizeOf(input)); } public static void ReleaseKey(Keys vk) { INPUT input = new INPUT(); input.type = INPUT_KEYBOARD; input.ki.dwFlags = KEYEVENTF_KEYUP; input.ki.wVk = (Int16)vk; SendInput(1, ref input, Marshal.SizeOf(input)); } public static void PressKey(Keys vk) { HoldKey(vk); ReleaseKey(vk); } } 

I tested it on this text box, which I write, when I pressed A , it sent Q

I'm not sure what the behavior on Warcraft III will be like, maybe they blocked it to prevent some kind of bot or something like that.

Answer 2

And when you look at your hook class, what is the source of the problem? It looks like the resource is not being managed properly.

Understand that if you plan to do this as some kind of practical joke, it will never go well, because in general, because of the inability to disable them. Also acknowledge that this type of seemingly unethical topic is unlikely to receive much support.