error LNK2001: unresolved external symbol "__declspec(dllimport) const XXXX::`vftable'"

錯誤：error LNK2001: unresolved external symbol "__declspec(dllimport) const CXxxxxx::`vftable'" ([email protected]@[email protected]) 建的類是導出類，以DLL擴展的方式導出，需要加宏_AFXEXT

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