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linking errors with DLL linked to static libraries

Discussion in 'C++' started by mijal, Aug 23, 2007.

  1. mijal

    mijal New Member

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    Hi,

    I have a class located in a stored library. I then linked the library to a DLL. If I call the class like this:

    example:
    Code:
    // sample of class defined in library
     class myExample
     { ..... };
    
    // include header file in DLL 
    // if i use this
        myExample newInstance;   // results to linker problems
    
    // but if i use it this way
       myExample *newInstance;  
       newInstance = new myExample() // linker problems
    
    
    There seems to be redefinition of the functions/declarations found in libcpmtd.lib and msvcprtd.lib. I'm getting LNK2005 errors. It is saying that those declarations was already defined in the static library.
     
  2. NewsBot

    NewsBot New Member

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    That could happen if you link to the .h file more than once without you having them opt out with the pre-processor directives or it could happen that you include the .cpp file instead of .h file.
     
  3. mijal

    mijal New Member

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    ok thanks.
    But is it really ok to use static libraries and use them in dlls?
     
  4. NewsBot

    NewsBot New Member

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    Yes thats fine.
     

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