1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: __thiscall ado: : ado (void)" (?????? 0 ado @ @ QAE @ XZ), the symbol in the function "protected: virtual int __thiscall Login: : OnInitDialog (void)" (? Referenced in OnInitDialog @ Login @ @ MAEHXZ)
1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: virtual __thiscall ado: : ~ ado (void)" (?????? 1 ado @ @ UAE @ XZ), the symbol in the function "protected: virtual int __thiscall Login: : OnInitDialog (void)" (? Referenced in OnInitDialog @ Login @ @ MAEHXZ)
1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: void __thiscall ado: : close (void)" (? The close @ ado @ @ QAEXXZ), the symbol in the function "protected: virtual int __thiscall Login: : OnInitDialog (void)" (? Referenced in OnInitDialog @ Login @ @ MAEHXZ)
1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: class ATL: : CStringT> __thiscall ado: : GetFieldValue (class ATL: : CStringT & gt;) "(? GetFieldValue @ ado @ @ QAE? AV? $CStringT @ DV? $StrTraitMFC @ DV? @ $ChTraitsCRT @ D ATL @ @ @ @ @ ATL @ @ V23 @ @ Z), the symbol in the function "protected: virtual int __thiscall Login: : OnInitDialog (void)" (? Referenced in OnInitDialog @ Login @ @ MAEHXZ)
1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: void __thiscall ado: : the ExecuteSQL (class ATL: : CStringT & gt;) "(? The ExecuteSQL @ ado @ @ QAEXV? $CStringT @ DV? $StrTraitMFC @ DV? @ $ChTraitsCRT @ D ATL @ @ @ @ @ ATL @ @ @ Z), the symbol in the function "protected: virtual void __thiscall Login: : OnOK (void)" (? OnOK @ Login @ @ MAEXXZ) referenced
1> The Login. Obj: error LNK2019: cannot resolve the external symbol of "public: void __thiscall ado: : rstOpen (class ATL: : CStringT & gt;) "(? RstOpen @ ado @ @ QAEXV? $CStringT @ DV? $StrTraitMFC @ DV? @ $ChTraitsCRT @ D ATL @ @ @ @ @ ATL @ @ @ Z), the symbol in the function "protected: virtual int __thiscall Login: : OnInitDialog (void)" (? In OnInitDialog @ Login @ @ MAEHXZ) is referenced

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The class member function implementation is not found, please send the corresponding. CPP or. The lib files are added to the project,