How to link subproject library into the executeable in Visual Studio

Posted on 2014-01-26
Last Modified: 2014-01-26
I have a project that I create a number of subprojects in Visual Studio c++ 2013.  I have defined the project dependency and build order.  However I still have unresolved external reference.  What can be a problem.  What else should I check.

Question by:tommym121
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LVL 86

Expert Comment

ID: 39810317
What exactly does the error message look like?

Author Comment

ID: 39810325
appmain.obj : error LNK2019: unresolved external symbol "public: __thiscall configSettings::configSettings(void)" (??0configSettings@@QAE@XZ) referenced in function _wmain
9>appmain.obj : error LNK2019: unresolved external symbol "public: void __thiscall configSettings::load(char const *)" (?load@configSettings@@QAEXPBD@Z) referenced in function _wmain
9>appmain.obj : error LNK2019: unresolved external symbol "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __thiscall configSettings::DataServer_IP(void)" (?DataServer_IP@configSettings@@QAE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function _wmain
9>appmain.obj : error LNK2019: unresolved external symbol "public: int __thiscall configSettings::DataServer_Port(void)" (?DataServer_Port@configSettings@@QAEHXZ) referenced in function _wmain

Author Comment

ID: 39810329
And this is my configSettings class

class configSettings

      std::string m_logLevel;      // log level Config.level
      bool m_logToConsole;         // log to console Config.logToConsole
      bool m_logToFile;                   // log to file Config.logToFile
      std::string m_DataServerIP;  // Data Server IP address Config.dataServerIP
      std::string m_logPath;             // Log directory/Path Config.LogPath
      int m_DataServerPort;             // DataServer Port number Config.dataServerPort
      void load(const std::string &filename);      
      void load(const char *filename);
      void save(const std::string &filename);

      int LogLevel();
      bool LogToFile();
      bool LogToConsole();
      std::string DataServer_IP();
      int DataServer_Port();

LVL 86

Expert Comment

ID: 39810336
Ah, OK, so name mangling can be ruled out. Is your 'configSettings' class within a static library or a DLL? If the latter applies, are you exporting it correctly and using the import library?

Author Comment

ID: 39810341
Please see the atttachment.
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LVL 86

Expert Comment

ID: 39810350
OK. How are you linking that library to executable? Did you add that 'configSettings.lib' as 'Additional Library' in the app's settings? Also, did you do that for both the 'Debug' and 'Release' configuration?

Author Comment

ID: 39810379
not working.  I have set Link Depenedency Yes

Author Comment

ID: 39810381
LVL 86

Accepted Solution

jkr earned 500 total points
ID: 39810392
Well, Setting 'Yes' isn't really enough, you need to specify the lib by name. Assuming that 'Additional Library Directories' contains the path where 'configSettings.lib' resides, try adding

#pragma comment(lib, "configSettings.lib")

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Author Closing Comment

ID: 39810562
Thanks.  It works.

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