类型的已垃圾回收委托进行了回调。这可能会导致应用程序崩溃、损坏和数据丢失。向非托管代码传递委托时，托管应用程序必须让这些委托保持活动状态，直到确信不会再次调用它们的问题的解决方法

标签：.net   c#   delegate   hook钩子   应用程序   

/// <summary>
/// 安装钩子的函数
/// </summary>
/// <param name="idHook"></param>
/// <param name="lpfn"></param>
/// <param name="hInstance"></param>
/// <param name="threadId"></param>
/// <returns></returns>
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
/// <summary>
/// 卸下钩子的函数
/// </summary>
/// <param name="idHook"></param>
/// <returns></returns>
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);
/// <summary>
/// 下一个钩挂的函数
/// </summary>
/// <param name="idHook"></param>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

//定义了一个委托
public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);


//定义一个代理
HookProc KeyboardHookDelegate;


/// <summary>
/// 创建钩子
/// </summary>
public void SetHook()
{
    KeyboardHookDelegate = new HookProc(KeyboardHookProc);
    Process cProcess = Process.GetCurrentProcess();
    ProcessModule cModule = cProcess.MainModule;
    var mh = GetModuleHandle(cModule.ModuleName);
    hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookDelegate, mh, 0);
}


public void UnHook()
{
    UnhookWindowsHookEx(hHook);
}


/// <summary>
/// 键盘钩子进程
/// </summary>
/// <param name="nCode"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <returns></returns>
private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
//...
//每到这里就报错
return CallNextHookEx(hHook, nCode, wParam, lParam);
}

public void SetHook()
{
    KeyboardHookDelegate = new HookProc(KeyboardHookProc);
    IntPtr intPtr = Marshal.GetHINSTANCE(System.Reflection.Assembly.GetExecutingAssembly().GetModules()[0]);
    hHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookDelegate, intPtr, 0);
}

类型的已垃圾回收委托进行了回调。这可能会导致应用程序崩溃、损坏和数据丢失。向非托管代码传递委托时，托管应用程序必须让这些委托保持活动状态，直到确信不会再次调用它们的问题的解决方法

标签：.net   c#   delegate   hook钩子   应用程序   

原文地址：http://blog.csdn.net/chenhongwu666/article/details/42029965