Can not pass CString variable as value argument to exported function in library

I have extension library having following function exported
__declspec(dllexport) int MyMessageBox(CString & csText, CString csCaption, const int iMsgType);
The linker error is coming for second argument when I try to call the function from client.
error LNK2001: unresolved external symbol "int __cdecl MyMessageBox(class ATL::CStringT<unsigned short,class StrTraitMFC_DLL<unsigned short,class ATL::ChTraitsCRT<unsigned short> > > &,class ATL::CStringT<unsigned short,class
StrTraitMFC_DLL<unsigned short,class ATL::ChTraitsCRT<unsigned short> > > &,int)" (?MyMessageBox@@YAHAAV?$CStringT@GV?$StrTraitMFC_DLL@GV?$ChTraitsCRT@G@ATL@@@@@ATL@@0H@Z)
I have checked project settings for both(client as well as DLL) and I think it may not an issue as both are using same character set and linker settings.
Please help.

On 3/26/2015 9:01 AM, AtulPP wrote:
I have extension library having following function exported
__declspec(dllexport) int MyMessageBox(CString & csText, CString csCaption, const int iMsgType);
The linker error is coming for second argument when I try to call the function from client.
error LNK2001: unresolved external symbol "int __cdecl MyMessageBox(class ATL::CStringT<unsigned short,class StrTraitMFC_DLL<unsigned short,class ATL::ChTraitsCRT<unsigned short> > > &,class ATL::CStringT<unsigned short,class
StrTraitMFC_DLL<unsigned short,class ATL::ChTraitsCRT<unsigned short> > > &,int)" (?MyMessageBox@@YAHAAV?$CStringT@GV?$StrTraitMFC_DLL@GV?$ChTraitsCRT@G@ATL@@@@@ATL@@0H@Z)
Use Dependency Walker (http://www.dependencywalker.com/) or dumpbin to discover the decorated name under which the function is actually exported from the DLL, compare with the one the linker
is complaining about.
What compiler version are you using? Seeing "unsigned short" where one would expect wchar_t is suspicious. VC6 did that (lacking a built-in wchar_t type), but it wouldn't have things like StrTraitMFC_DLL. I suspect you are building one of the
two modules with /Zc:wchar_t- (Project > Properties > C/C++ > Language > Treat wchar_t As Built-in Type = No).
Igor Tandetnik

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