DetectedCallbackOnCollectedDelegateinglobalKeyboardHook此类允许检查是否在任何地方按下了键盘键。过了一段时间我有一个错误：**检测到CallbackOnCollectedDelegate**对类型为“Browser!Utilities.globalKeyboardHook+keyboardHookProc::Invoke”的垃圾收集委托进行了回调。这可能会导致应用程序崩溃、损坏和数据丢失。将委托传递给非托管代码时，它们必须由托管应用程序保持活动状态，直到保证它们永远不会被调用。这是globalkeyboardHook类：publicdelegateintkeyboardHookProc(intcode,intwParam,refkeyboardHookStructlParam);publicstructkeyboardHookStruct{publicintvkCode;公共int扫描代码；公共int标志；公共时间；公共诠释dwExtraInfo;}constintWH_KEYBOARD_LL=13;constintWM_KEYDOWN=0x100;constintWM_KEYUP=0x101;constintWM_SYSKEYDOWN=0x104;constintWM_SYSKEYUP=0x105;publicListHookedKeys=newList();IntPtrhhook=IntPtr.Zero;公共事件KeyEventHandlerKeyDown；公共事件KeyEventHandlerKeyUp；公共全球键盘dHook(){挂钩();}~globalKeyboardHook(){unhook();}publicvoidhook(){IntPtrhInstance=LoadLibrary("User32");hhook=SetWindowsHookEx(WH_KEYBOARD_LL,hookProc,hInstance,0);}publicvoidunhook(){UnhookWindowsHookEx(hhook);}publicinthookProc(intcode,intwParam,refkeyboardHookStructlParam){if(code>=0){Keyskey=(Keys)lParam.vkCode;如果(HookedKeys.Contains(key)){KeyEventArgskea=newKeyEventArgs(key);如果((wParam==WM_KEYDOWN||wParam==WM_SYSKEYDOWN)&&(KeyDown!=null)){KeyDown(this,kea);}elseif((wParam==WM_KEYUP||wParam==WM_SYSKEYUP)&&(KeyUp!=null)){KeyUp(this,kea);}如果（kea.Handled）返回1；}}returnCallNextHookEx(hhook,code,wParam,reflParam);}[DllImport("user32.dll")]staticexternIntPtrSetWindowsHookEx(intidHook,keyboardHookProccallback,IntPtrhInstance,uintthreadId);[DllImport("user32.dll")]staticexternboolUnhookWindowsHookEx(IntPtrhInstance);[DllImport("user32.dll")]staticexternintCallNextHookEx(IntPtridHook,intnCode,intwParam,refkeyboardHookStructlParam);[DllImport("kernel32.dll")]staticexternIntPtrLoadLibrary(stringlpFileName);#endregion知道如何解决吗？程序运行正常，但过了一会儿程序冻结了，我得到了这个错误hhook=SetWindowsHookEx(WH_KEYBOARD_LL,hookProc,hInstance,0);这是你的问题。您依靠C#语法糖来自动创建hookProc的委托对象。实际的代码生成看起来像这样：keyboardHookProc$temp=newkeyboardHookProc(hookProc);hhook=SetWindowsHookEx(WH_KEYBOARD_LL,$temp,hInstance,0);只有一个对委托对象的引用，$temp。但它是一个局部变量，一旦您的hook()方法停止执行并返回，它就会消失。垃圾收集器看不到Windows对它有一个“引用”，它不能探测非托管代码以获取引用。因此，下次垃圾收集器运行时，委托对象将被销毁。当Windows执行挂钩回调时，这就是kaboom。内置的MDA会检测问题并在程序因AccessViolation而崩溃之前生成有用的诊断信息。您需要创建对足够长的委托对象的附加引用。例如，您可以使用GCHandle。或者更简单，只需自己存储引用，这样垃圾收集器就始终可以看到它。向您的班级添加一个字段。将其设置为静态是确保无法收集对象的可靠方法：privatestatickeyboardHookProccallbackDelegate；publicvoidhook(){if(callbackDelegate!=null)thrownewInvalidOperationException("不能多次挂钩");IntPtrhInstance=LoadLibrary("User32");callbackDelegate=newkeyboardHookProc(hookProc);hhook=SetWindowsHookEx(WH_KEYBOARD_LL,callbackDelegate,hInstance,0);如果（hhook==IntPtr.Zero）抛出新的Win32Exception（）；}publicvoidunhook(){if(callbackDelegate==null)返回；boolok=UnhookWindowsHookEx(hhook);如果(!ok)抛出新的Win32Exception()；回调委托=空；无需pinvokeFreeLibrary，user32.dll始终加载，直到您的程序终止。以上为C#学习教程：检测到globalKeyboardHook中CallbackOnCollectedDelegate共享的所有内容。如果对你有用，需要进一步了解C#学习教程，希望大家多多关注。本文收集自网络，不代表立场。如涉及侵权请点击右侧联系管理员删除。如需转载请注明出处：
