エラーの解決方法：LNK2019：未解決の外部シンボル「public」？

Question

ソフトウェア用のプラグインを作りたいです。プラグインを作成するには、.dllファイルを作成する必要がありますが、作成には多くの課題がありました。私のシステムはWindows 7で、Microsoft Visual Studio 2010をIDEとして使用しています。私はdllプロジェクトを作って、2つのソースファイル、1つのヘッダファイルを作成してから、ソリューションを構築しましたが、次のエラーが発生しました。

注：ソリューションをビルドする前に、ソフトウェアのincludeディレクトリとlibディレクトリのパスを追加しました。

1>  Creating library C:\Users\pars\Desktop\example\FEneohookean\Debug\FEneohookean.lib and object C:\Users\pars\Desktop\example\FEneohookean\Debug\FEneohookean.exp 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall FECoreFactory::~FECoreFactory(void)" (??1FECoreFactory@@UAE@XZ) referenced in function __ 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: void __thiscall FECoreKernel::RegisterClass(class FECoreFactory *)" (?RegisterClass@FECoreKernel@@QAEXPAVFECoreFactory@@@Z) referenced in function "public: __thiscall FERegisterClass_T<class FENeoHookeanPI>::FERegisterClass_T<class FENeoHookeanPI>(unsigned int,char const *)" (??0?$FERegisterClass_T@VFENeoHookeanPI@@@@QAE@IPBD@Z) 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: static class FECoreKernel & __cdecl FECoreKernel::GetInstance(void)" (?GetInstance@FECoreKernel@@SAAAV1@XZ) referenced in function "public: __thiscall FERegisterClass_T<class FENeoHookeanPI>::FERegisterClass_T<class FENeoHookeanPI>(unsigned int,char const *)" (??0?$FERegisterClass_T@VFENeoHookeanPI@@@@QAE@IPBD@Z) 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: __thiscall FECoreFactory::FECoreFactory(unsigned int,char const *)" (??0FECoreFactory@@QAE@IPBD@Z) referenced in function "public: __thiscall FERegisterClass_T<class FENeoHookeanPI>::FERegisterClass_T<class FENeoHookeanPI>(unsigned int,char const *)" (??0?$FERegisterClass_T@VFENeoHookeanPI@@@@QAE@IPBD@Z) 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: __thiscall FEElasticMaterial::FEElasticMaterial(class FEModel *)" (??0FEElasticMaterial@@QAE@PAVFEModel@@@Z) referenced in function "public: __thiscall FENeoHookeanPI::FENeoHookeanPI(class FEModel *)" (??0FENeoHookeanPI@@QAE@PAVFEModel@@@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual class FEParam * __thiscall FEMaterial::GetParameter(class ParamString const &)" (?GetParameter@FEMaterial@@UAEPAVFEParam@@ABVParamString@@@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall FEMaterial::Serialize(class DumpFile &)" (?Serialize@FEMaterial@@UAEXAAVDumpFile@@@Z) 
1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual bool __thiscall FEElasticMaterial::SetAttribute(char const *,char const *)" (?SetAttribute@FEElasticMaterial@@UAE_NPBD0@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual bool __thiscall FEElasticMaterial::SetAttribute(char const *,char const *)" (?SetAttribute@FEElasticMaterial@@UAE_NPBD0@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall FEMaterial::Properties(void)" (?Properties@FEMaterial@@UAEHXZ) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual class FECoreBase * __thiscall FEMaterial::GetProperty(int)" (?GetProperty@FEMaterial@@UAEPAVFECoreBase@@H@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual int __thiscall FEMaterial::FindPropertyIndex(char const *)" (?FindPropertyIndex@FEMaterial@@UAEHPBD@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual bool __thiscall FEMaterial::SetProperty(int,class FECoreBase *)" (?SetProperty@FEMaterial@@UAE_NHPAVFECoreBase@@@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall FESolidMaterial::Density(void)" (?Density@FESolidMaterial@@UAENXZ) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall FEElasticMaterial::SetLocalCoordinateSystem(class FEElement &,int,class FEMaterialPoint &)" (?SetLocalCoordinateSystem@FEElasticMaterial@@UAEXAAVFEElement@@HAAVFEMaterialPoint@@@Z) 
    1>dllmain.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall FEElasticMaterial::StrainEnergyDensity(class FEMaterialPoint &)" (?StrainEnergyDensity@FEElasticMaterial@@UAENAAVFEMaterialPoint@@@Z) 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: __thiscall FEElasticMaterialPoint::FEElasticMaterialPoint(void)" (??0FEElasticMaterialPoint@@QAE@XZ) referenced in function "public: virtual class FEMaterialPoint * __thiscall FEElasticMaterial::CreateMaterialPointData(void)" (?CreateMaterialPointData@FEElasticMaterial@@UAEPAVFEMaterialPoint@@XZ) 
    1>dllmain.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall FEElasticMaterial::~FEElasticMaterial(void)" (??1FEElasticMaterial@@UAE@XZ) referenced in function "public: virtual __thiscall FENeoHookeanPI::~FENeoHookeanPI(void)" (??1FENeoHookeanPI@@UAE@XZ) 
    1>FENeoHookeanPI.obj : error LNK2019: unresolved external symbol "protected: void __thiscall FEParamContainer::AddParameter(void *,enum FEParamType,int,class RANGE,char const *)" (?AddParameter@FEParamContainer@@IAEXPAXW4FEParamType@@HVRANGE@@PBD@Z) referenced in function "protected: virtual void __thiscall FENeoHookeanPI::BuildParamList(void)" (?BuildParamList@FENeoHookeanPI@@MAEXXZ) 
    1>FENeoHookeanPI.obj : error LNK2019: unresolved external symbol "protected: virtual void __thiscall FESolidMaterial::BuildParamList(void)" (?BuildParamList@FESolidMaterial@@MAEXXZ) referenced in function "protected: virtual void __thiscall FENeoHookeanPI::BuildParamList(void)" (?BuildParamList@FENeoHookeanPI@@MAEXXZ) 
    1>FENeoHookeanPI.obj : error LNK2019: unresolved external symbol "public: virtual void __thiscall FEElasticMaterial::Init(void)" (?Init@FEElasticMaterial@@UAEXXZ) referenced in function "public: virtual void __thiscall FENeoHookeanPI::Init(void)" (?Init@FENeoHookeanPI@@UAEXXZ) 
    1>FENeoHookeanPI.obj : error LNK2019: unresolved external symbol "public: class mat3ds __thiscall FEElasticMaterialPoint::LeftCauchyGreen(void)" (?LeftCauchyGreen@FEElasticMaterialPoint@@QAE?AVmat3ds@@XZ) referenced in function "public: virtual class mat3ds __thiscall FENeoHookeanPI::Stress(class FEMaterialPoint &)" (?Stress@FENeoHookeanPI@@UAE?AVmat3ds@@AAVFEMaterialPoint@@@Z) 
    1>C:\Users\pars\Desktop\example\FEneohookean\Debug\FEneohookean.dll : fatal error LNK1120: 21 unresolved externals 
    1> 
    1>Build FAILED 

これらのエラーを解決するにはどうすればよいですか？

Answer 1

ライブラリパスをプロジェクト設定に追加するだけでなく、必要なライブラリファイル（.lib）もリンカの追加の依存関係として追加することを確認してください。 project-> properties-> linker-> Inputに追加の依存関係入力フィールドがあり、ライブラリファイルの実際の名前（拡張子付き）をスペースで区切って追加することができます。