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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Didn't work with virtual functions","articleBody":"I'm using the latest version [5f83e41](https://github.com/fancycode/MemoryModule/commit/5f83e41c3a3e7c6e8284a5c1afa5a38790809461)\nand VS2022.\nto reproduce this issue,please add a file ``ISampleDLL.h`` in SampleDLL dir:\n```\n#pragma once\n\nclass ISampleDLL\n{\npublic:\n\tvirtual ~ISampleDLL() = default;\n\tvirtual int addNumbers(int a,int b) = 0;\n};\n```\nand replace ``SampleDLL.h``\n```\n#include \"ISampleDLL.h\"\nclass SampleDLL: public ISampleDLL\n{\npublic:\n\tstatic SampleDLL\u0026 Instance();\n\t\n\tvirtual int addNumbers(int a,int b) override;\nprivate:\n\tSampleDLL();\n\t~SampleDLL();\n\tSampleDLL(const SampleDLL\u0026) = delete;\n\tSampleDLL\u0026 operator=(const SampleDLL\u0026) = delete;\n};\n```\n``SampleDLL.cpp``\n```\n#include \"SampleDLL.h\"\n\nSampleDLL::SampleDLL()\n{}\n\nSampleDLL::~SampleDLL()\n{}\n\nSampleDLL\u0026 SampleDLL::Instance()\n{\n\tstatic SampleDLL instance;\n\treturn instance;\n}\n\nint SampleDLL::addNumbers(int a,int b)\n{\n\treturn a + b;\n}\n\nextern \"C\" __declspec(dllexport) ISampleDLL* CreateSampleDLL()\n{\n\treturn \u0026SampleDLL::Instance();\n}\n```\nedit ``DllLoader.cpp``\n```\n...\n#include \"../SampleDLL/ISampleDLL.h\"\n...\nvoid LoadFromMemory(void)\n{\n...\n        using GetSampleDLL=ISampleDLL* (*)();\n        //addNumber = (addNumberProc)MemoryGetProcAddress(handle, \"addNumbers\");\n        GetSampleDLL getSampleDLL = (GetSampleDLL)MemoryGetProcAddress(handle,\"CreateSampleDLL\");\n        ISampleDLL* sampleDLL = getSampleDLL();\n        _tprintf(_T(\"From memory: %d\\n\"), sampleDLL-\u003eaddNumbers(1, 2));\n...\n}\n```\nthen variable ``getSampleDLL`` and ``sampleDLL`` have not null address,but the vftable of ``sampleDLL`` got adress 0x0.\n\nps. I have read [issue#31](https://github.com/fancycode/MemoryModule/issues/31) but it didn't solve my problem","author":{"url":"https://github.com/xkcd50","@type":"Person","name":"xkcd50"},"datePublished":"2025-03-15T13:33:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/118/MemoryModule/issues/118"}