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POFindConnectionPoint method returning null connection point
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  1. POFindConnectionPoint method returning null connection point
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    copied!<p>I found this <a href="https://stackoverflow.com/questions/17338655/subscribe-the-c-sharp-event-in-native-c-using-com-interop">POST</a> which near about resembles my code while doing COM Interop Event Handling using <code>IConnectionPoints</code> Interface.<br> Please suggest me if you have any information related to this topic.</p> <p>I know that <code>FindConnectionPoint</code> returns <code>NULL</code> if there is an error in COnnectionPoint with the source interface(EventInterface).</p> <p>I checked my COM object supporting the source interface by QueryInterface method(P.S::HRESULT returns S_OK). </p> <p>What type of error is occurring here?<br> Please refer to the post. I have the same problem. <strong>UPDATE:</strong> My tlh file snapshot>></p> <pre><code>// // Named GUID constants initializations // extern "C" const GUID __declspec(selectany) LIBID_CSharp = {0x4e5098b7,0x4e51,0x45e5,{0xa7,0x05,0xa7,0xe3,0xc5,0x1e,0x2a,0x80}}; extern "C" const GUID __declspec(selectany) CLSID_PropertyChangeEventArgs = {0xe3a5b5e1,0xda28,0x32cf,{0x93,0x9c,0x18,0x6e,0x90,0xe8,0xd1,0x08}}; extern "C" const GUID __declspec(selectany) IID_ISomeInterface = {0x5f4c254f,0xa363,0x4afd,{0xad,0x5d,0x6d,0x52,0x83,0xfa,0x5e,0x59}}; extern "C" const GUID __declspec(selectany) CLSID_Class1 = {0xf08e4034,0x6904,0x49c4,{0xa2,0x89,0x52,0xf2,0x72,0xc9,0xe6,0x58}}; extern "C" const GUID __declspec(selectany) IID__DownloadEventArgs = {0x6df89fd5,0xa7be,0x3699,{0x98,0x57,0xa3,0xe2,0xec,0x69,0xd2,0x60}}; extern "C" const GUID __declspec(selectany) IID_ISomeEventsInterface = {0x1e430900,0xd303,0x490a,{0xa4,0x73,0xca,0x91,0x46,0xc6,0x7e,0x75}}; } // namespace CSharp </code></pre> <p>My cpp file snapshot>></p> <pre><code>IUnknown* pIUnknown ; HRESULT hresult = CoInitialize(NULL); IConnectionPointContainer* pIConnectionPointContainerTemp; IConnectionPoint* pIConnectionPoint; DWORD* cookie=0; CSharp::ISomeInterfacePtr pIsomeInterface(__uuidof(CSharp::Class1)); hresult=CoCreateInstance(__uuidof(CSharp::Class1), NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, (void**)&amp;pIUnknown); hresult=pIsomeInterface-&gt;QueryInterface(IID_IConnectionPointContainer, (void**)&amp;pIConnectionPointContainerTemp); pIConnectionPointContainerTemp-&gt;FindConnectionPoint(CSharp::IID_ISomeEventsInterface ,&amp;pIConnectionPoint);//Added QUICK watch here&gt;&gt;raised error here CXX0017: Error: symbol "ManagedDLL::IID_ISomeEventsInterface " not found </code></pre>
 

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