I have been using this key hook script i found but I continue to get an error after a few seconds of using it in my program. The error says.. A call has been made on a garbage collected delegate 'keylogger!Utilities.globalKeyboardHook+keyboardHookProc::Invoke'.
How can I fix this?
namespace Utilities { /// /// A class that manages a global low level keyboard hook /// class globalKeyboardHook { #region Constant, Structure and Delegate Definitions /// /// defines the callback type for the hook /// public delegate int keyboardHookProc(int code, int wParam, ref keyboardHookStruct lParam); public struct keyboardHookStruct { public int vkCode; public int scanCode; public int flags; public int time; public int dwExtraInfo; } const int WH_KEYBOARD_LL = 13; const int WM_KEYDOWN = 0x100; const int WM_KEYUP = 0x101; const int WM_SYSKEYDOWN = 0x104; const int WM_SYSKEYUP = 0x105; #endregion #region Instance Variables /// /// The collections of keys to watch for /// public List HookedKeys = new List(); /// /// Handle to the hook, need this to unhook and call the next hook /// IntPtr hhook = IntPtr.Zero; #endregion #region Events /// /// Occurs when one of the hooked keys is pressed /// public event KeyEventHandler KeyDown; /// /// Occurs when one of the hooked keys is released /// public event KeyEventHandler KeyUp; #endregion #region Constructors and Destructors /// /// Initializes a new instance of the public globalKeyboardHook() { hook(); } /// /// Releases unmanaged resources and performs other cleanup operations before the /// ~globalKeyboardHook() { unhook(); } #endregion #region Public Methods /// /// Installs the global hook /// public void hook() { IntPtr hInstance = LoadLibrary("User32"); hhook = SetWindowsHookEx(WH_KEYBOARD_LL, hookProc, hInstance, 0); } /// /// Uninstalls the global hook /// public void unhook() { UnhookWindowsHookEx(hhook); } /// /// The callback for the keyboard hook /// /// The hook code, if it isn't >= 0, the function shouldn't do anyting /// The event type /// The keyhook event information /// /// Sets the windows hook, do the desired event, one of hInstance or threadId must be non-null /// /// The id of the event you want to hook /// The callback. /// The handle you want to attach the event to, can be null /// The thread you want to attach the event to, can be null /// a handle to the desired hook [DllImport("user32.dll")] static extern IntPtr SetWindowsHookEx(int idHook, keyboardHookProc callback, IntPtr hInstance, uint threadId); /// /// Unhooks the windows hook. /// /// The hook handle that was returned from SetWindowsHookEx /// True if successful, false otherwise [DllImport("user32.dll")] static extern bool UnhookWindowsHookEx(IntPtr hInstance); /// /// Calls the next hook. /// /// The hook id /// The hook code /// The wparam. /// The lparam. /// /// Loads the library. /// /// Name of the library /// A handle to the library [DllImport("kernel32.dll")] static extern IntPtr LoadLibrary(string lpFileName); #endregion } } globalKeyboardHook class :
using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using System.Windows.Forms; using System.IO; namespace Utilities { /// /// A class that manages a global low level keyboard hook /// class globalKeyboardHook : IDisposable { private bool _disposed; #region Constant, Structure and Delegate Definitions /// /// defines the callback type for the hook /// public delegate int keyboardHookProc(int code, int wParam, ref keyboardHookStruct lParam); public struct keyboardHookStruct { public int vkCode; public int scanCode; public int flags; public int time; public int dwExtraInfo; } const int WH_KEYBOARD_LL = 13; const int WM_KEYDOWN = 0x100; const int WM_KEYUP = 0x101; const int WM_SYSKEYDOWN = 0x104; const int WM_SYSKEYUP = 0x105; #endregion #region Instance Variables /// /// The collections of keys to watch for /// public List HookedKeys = new List(); /// /// Handle to the hook, need this to unhook and call the next hook /// IntPtr hhook = IntPtr.Zero; #endregion #region Events /// /// Occurs when one of the hooked keys is pressed /// public event KeyEventHandler KeyDown; /// /// Occurs when one of the hooked keys is released /// public event KeyEventHandler KeyUp; #endregion #region Constructors and Destructors /// /// Initializes a new instance of the public globalKeyboardHook() { hook(); _disposed = false; } public void Dispose() { Dispose(true); // Use SupressFinalize in case a subclass // of this type implements a finalizer. GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { // If you need thread safety, use a lock around these // operations, as well as in your methods that use the resource. if (!_disposed) { if (disposing) { unhook(); } // Indicate that the instance has been disposed. _disposed = true; } } /// /// Releases unmanaged resources and performs other cleanup operations before the /// ~globalKeyboardHook() { Dispose(); } #endregion #region Public Methods /// /// Installs the global hook /// public void hook() { IntPtr hInstance = LoadLibrary("User32"); hhook = SetWindowsHookEx(WH_KEYBOARD_LL, new keyboardHookProc(hookProc), hInstance, 0); } /// /// Uninstalls the global hook /// public void unhook() { UnhookWindowsHookEx(hhook); } /// /// The callback for the keyboard hook /// /// The hook code, if it isn't >= 0, the function shouldn't do anyting /// The event type /// The keyhook event information /// /// Sets the windows hook, do the desired event, one of hInstance or threadId must be non-null /// /// The id of the event you want to hook /// The callback. /// The handle you want to attach the event to, can be null /// The thread you want to attach the event to, can be null /// a handle to the desired hook [DllImport("user32.dll")] static extern IntPtr SetWindowsHookEx(int idHook, keyboardHookProc callback, IntPtr hInstance, uint threadId); /// /// Unhooks the windows hook. /// /// The hook handle that was returned from SetWindowsHookEx /// True if successful, false otherwise [DllImport("user32.dll")] static extern bool UnhookWindowsHookEx(IntPtr hInstance); /// /// Calls the next hook. /// /// The hook id /// The hook code /// The wparam. /// The lparam. /// /// Loads the library. /// /// Name of the library /// A handle to the library [DllImport("kernel32.dll")] static extern IntPtr LoadLibrary(string lpFileName); #endregion } } I updated the code with IDisposable. I am probably horribly off on what I am supposed to do but its still not working