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POAdded reference to .lib project - project not using .cpp file?
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copied!<p>I am still reasonably new to C++ so forgive me if I have misunderstood something.</p> <p>I have a C++ library that contains sql connection classes, and I want to use it in a project. I have:</p> <ul> <li>Added it to the same solution</li> <li>Added a reference to it in "Framework and References"</li> <li>Included in the library's header file in stdafx.cpp of the main project</li> <li>Added the library project's directory as an include directory to the main project</li> </ul> <p>But when compiling the project I am still getting a number of <code>unresolved external symbol</code> errors.</p> <p><strong>If I include the library project's *.cpp file it works fine</strong>, but I didn't think you would have to do this.</p> <hr> <p>These are the exact errors I am getting:</p> <pre><code>2>Link: 2> sqlConnector.obj : MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG; add /LTCG to the link command line to improve linker performance 2> Creating library .\Release\MainProject.lib and object .\Release\MainProject.exp 2>LINK : warning LNK4098: defaultlib 'mfc100u.lib' conflicts with use of other libs; use /NODEFAULTLIB:library 2>LINK : warning LNK4098: defaultlib 'mfcs100u.lib' conflicts with use of other libs; use /NODEFAULTLIB:library 2>MainProject.obj : error LNK2001: unresolved external symbol "public: bool __thiscall SQLQuery::AddParameter(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >)" (?AddParameter@SQLQuery@@QAE_NV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@@Z) 2>MainProject.obj : error LNK2001: unresolved external symbol "public: void __thiscall SQLQuery::SetQuery(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >)" (?SetQuery@SQLQuery@@QAEXV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@@Z) 2>MainProject.obj : error LNK2001: unresolved external symbol "public: bool __thiscall SQLQuery::Open(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >)" (?Open@SQLQuery@@QAE_NV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@@Z) 2>MainProject.obj : error LNK2001: unresolved external symbol "public: void __thiscall SQLQuery::SetConnectionString(class ATL::CStringT<char,class StrTraitMFC_DLL<char,class ATL::ChTraitsCRT<char> > >)" (?SetConnectionString@SQLQuery@@QAEXV?$CStringT@DV?$StrTraitMFC_DLL@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@@Z) 2>sqlConnector.obj : error LNK2001: unresolved external symbol "public: void __thiscall CAMTrace::SetEXEName(wchar_t const *)" (?SetEXEName@CAMTrace@@QAEXPB_W@Z) 2>sqlConnector.obj : error LNK2001: unresolved external symbol "public: void __thiscall CAMTrace::Trace(wchar_t const *,int,int)" (?Trace@CAMTrace@@QAEXPB_WHH@Z) 2>.\Release\MainProject.exe : fatal error LNK1120: 6 unresolved externals </code></pre>

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