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

错误：error LNK2001: unresolved external symbol "__declspec(dllimport) const CXxxxxx::`vftable'" ([email protected]@[email protected]) 建的类是导出类，以DLL扩展的方式导出，需要加宏_AFXEXT

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