error LNK2019: unresolved external symbol

This is a discussion on error LNK2019: unresolved external symbol within the C++ Programming forums, part of the General Programming Boards category; Pretty new to C++ and even newer to Visual 2010 but basically I'm getting this linker error Code: error LNK2019: ...

  1. #1
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    error LNK2019: unresolved external symbol

    Pretty new to C++ and even newer to Visual 2010 but basically I'm getting this linker error
    Code:
     error LNK2019: unresolved external symbol "public: int __thiscall wav::OpenReadEx(char *,int)" (?OpenReadEx@Cwav@@QAEHPADH@Z) referenced in function _wmain
    and my test code is basic its like

    Code:
    #include "stdafx.h"
    #include "wav.h"
    wav g_wav;
    
    int _tmain(int argc, _TCHAR* argv[])
    {
    	int i;
    	i=3;
    	i = g_wav.OpenReadEx("Pink_Noise_Loop",1);
    	return 0;
    }
    So im thinking its just the makefile that can't link to the wav.h where the OpenReadEx function is being called from. Okay also in visual ive opened 2 projects one project is test2. and the second is sourceCode. and in the properities of C/C++ i put in the include the directory where the sourceCode is . And sourceCode holds wav.h and wav.cpp so iono why is still having this linker problem

  2. #2
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    The linking is done to a lib file, not an include file. Make sure you include the sourceCode lib file and directory in the project settings' linker options.

  3. #3
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    So i checked the sourceCode directory and There isnt a .lib file in there? how do u create it then or does visual suppose to have it created

  4. #4
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    If that's your own code, you have to build that project and create a lib file. If that's a project from somewhere else, then it would probably come with a lib file.

    If that's your code, is there a reason you are separating it into its own project? The simple solution would be to put into the same project as your test and then it will be compiled and linked together. If you want to keep it as a separate project, then you just need to make sure the sourceCode project is set up to output a lib file when you build it. It will be placed in the Debug (or Release) directory by default.

  5. #5
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    its someone elses seperate code that im trying to use or just use a few functions so i check the debug file and theres isnt a .lib file and i already rebuild it again so how do u set the project to output a .lib file

  6. #6
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    What does that project output when it is built? (And what version of VC++ are you using?)

  7. #7
    C++まいる!Cをこわせ!
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    Quote Originally Posted by Daved View Post
    (And what version of VC++ are you using?)
    2010, as stated in the first post.
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  8. #8
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    Sorry i found the .lib file it was under my original project test2/debug dont really understand y it was there instead of sourceCode/debug but it compiled thanks

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