实现Com连接点产生异常(0x80020010 无效的被呼叫方)解决办法

来源：互联网发布：加工中心半圆编程范例编辑：程序博客网时间：2024/05/17 01:28

今天用IDispEventSimpleImpl(IDispEventImpl)在客户代码中实现了一个回调接口类，但是在运行时造成异常，提示0x80020010 无效的被呼叫方，应google，发现接口类中函数没有使用__stdcall声明，造成了这种异常，随笔记一下，写了下实现代码，供查阅

//Sink.hextern const IID DIID__IShopStaObjEvents;extern _ATL_FUNC_INFO ResultInfo;class CSink : public CComObjectRootEx<CComSingleThreadModel>,public CComCoClass<CSink>,public IDispEvent(Simple)Impl<1, CSink, &DIID__IShopStaObjEvents>,public IUnknown{public:typedef IDispEvent(Simple)Impl<1, CSink, &DIID__IShopStaObjEvents> _baseCls;BEGIN_COM_MAP(CSink)COM_INTERFACE_ENTRY_IID(IID_IDispatch, _baseCls)END_COM_MAP()BEGIN_SINK_MAP(CSink)SINK_ENTRY_INFO(1, DIID__IShopStaObjEvents, 1, Pay, &ResultInfo)END_SINK_MAP()void __stdcall Pay(LONG lResult){int i=lResult;i++;}};

// Sink.cppconst IID DIID__IShopStaObjEvents = __uuidof(_IShopStaObjEvents);_ATL_FUNC_INFO ResultInfo = { CC_STDCALL, VT_EMPTY, 1, {VT_I4}};

//main.cppCAppModule _Module;CComObject<CSink> sink;int _tmain(int argc, _TCHAR* argv[]){_Module.Init(NULL,NULL);CoInitializeEx(NULL,COINIT_APARTMENTTHREADED);IShopStaObjPtr spObj;HRESULT hr;sink.AddRef();hr = spObj.CreateInstance(__uuidof(ShopStaObj));sink.DispEventAdvise(spObj);spObj->Buy(4);sink.DispEventUnadvise(spObj);spObj.Release();return 0;}

PS. 经调试发现，注释掉语句sink.DispEventUnadvise(spObj)后，spObj执行Release时对象依然会被释放，所以个人认为挂载回调接口不会增加com对象的计数。

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