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Linker error

Hi Experts,
I'm using Visual Studio 2010.  Having problems converting a project.  I'm getting the following linker error:

1>------ Build started: Project: KKGActivation, Configuration: Debug Win32 ------
1>Build started 16/11/2010 11:41:55 AM.
1>InitializeBuildStatus:
1>  Touching "Debug\KKGActivation.unsuccessfulbuild".
1>ClCompile:
1>  All outputs are up-to-date.
1>SecurityHelper.lib(Fingerprint.obj) : error LNK2019: unresolved external symbol "__declspec(dllimport) public: static __int64 __cdecl Poco::StreamCopier::copyStream(class std::basic_istream<char,struct std::char_traits<char> > &,class std::basic_ostream<char,struct std::char_traits<char> > &,unsigned int)" (__imp_?copyStream@StreamCopier@Poco@@SA_JAAV?$basic_istream@DU?$char_traits@D@std@@@std@@AAV?$basic_ostream@DU?$char_traits@D@std@@@4@I@Z) referenced in function "public: static class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl CFingerprint::GetFingerprint(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?GetFingerprint@CFingerprint@@SA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V23@@Z)
1>C:\devlio2008\OpenGLGraph\KneeKG\Debug\Debug\\KKGActivation.exe : fatal error LNK1120: 1 unresolved externals


As you can see, it's referencing the SecurityHelper.lib and cannot find Poco::StreamCopier::CopyStream.  I do have this library referenced in the KKGActivation project as an included library as well as in SecurityHelper.  What am I missing??

Thanks,
Mike
0
thready
Asked:
thready
1 Solution
 
jkrCommented:
You seem to be using Poco (http://poco.sourcearchive.com/documentation/1.3.5/classPoco_1_1StreamCopier.html) without linking to the library - download it from http://pocoproject.org/download/index.html and build it, then add the library to your project.
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threadyAuthor Commented:
Poco is built and I am linking to the library.  The files exist in their location - moreover, SecurityHelper is a static library that itself links to Poco and builds properly. However, when I try to build KKGActivation, it seems that all of a sudden SecurityHelper cannot find the library it needs to build (even though it's already built!)

I don't get it...
0
 
HooKooDooKuCommented:
Do you have the setting for "Additional Library Directories" set?
If not, add the path for the library to this setting so that the compiler can find the library file.
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threadyAuthor Commented:
Unfortunately that's set as well...  
0
 
threadyAuthor Commented:
I think it's because I built the Poco libraries with VS2008.  There's no build for Poco on VS2010 yet either.  Am I up poop creek?
0
 
logic_chopperCommented:
I've had this problem before, the solution can be found on the Microsoft web site, have a look at, "To Export a Class Containing a Data Member that Is an STL Object".  I mention this because I see your linker error include a reference to STL basic_string.

http://support.microsoft.com/kb/168958

Here is an example fix:

// top of header
#ifdef BUILD_DLL
#define EXPORT_TEMP
#else
#define EXPORT_TEMP extern
#endif

template <class T>
class SomeClass
{
};

// and then add this at the bottom of the header
EXPORT_TEMP template class SomeClass<SomeType>;
0
 
threadyAuthor Commented:
The problem was that I needed the most current build (non-release even) of Poco to work with Visual Studio 2010.
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threadyAuthor Commented:
Needed the most current build of Poco
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