error LNK2019: unresolved external symbol "__declspec(dllimport) const CReadUserInfo::`vftable'" (__

使用VS2010編寫DLL工程時出現如下錯誤  Creating library E:\Product1\DlagDll\Debug\DlagDll.lib and object E:\Product1\DlagDll\Debug\DlagDll.exp  1>ReadUserInfo.obj : error LNK2019: unresolved external symbol 「_declsp

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