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QueryInterface
IUnknown *p2; hr = pInnerUnknown->QueryInterface(vGUID2, (void**)&p2);
IUnknown *pOutUnknown;
CoCreateInstance(vGUID, NULL, CLSCTX_INPROC_SERVER, vIIDGUID, (void**)&pOutUnknown);
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原文地址:http://www.cnblogs.com/cb168/p/4736223.html