How I properly declare an exported function that is also used locally?

This is a discussion on How I properly declare an exported function that is also used locally? within the C Programming forums, part of the General Programming Boards category; Hi, I have a FuncA() inside the EXE. FuncA() is called from inside the EXE and from inside a DLL. ...

  1. #1
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    How I properly declare an exported function that is also used locally?

    Hi,
    I have a FuncA() inside the EXE. FuncA() is called from inside the EXE and from inside a DLL. Therefore, I wrote a callback function for FuncA() so that the DLL can call to it. Hence, I need to export FuncA() so that I can get the function address from inside the DLL.
    Code:
    declspec(dllexport) void FuncA(){ return; }//declspec(dllexport) is to be able to get the function address.
    However,
    Because FuncA() is called from DLL AND from inside the EXE as well,
    my problem is the declaration of funcA() inside the EXE. That declaration will be used by the functions inside the EXE.
    Code:
    void FuncA();//If I write it this way I get the following error:
    error C2375: 'FuncA' : redefinition; different linkage
    And,
    Code:
    declspec(dllimport) void FuncA();//If I write it this way, I get the following warning and the program hangs.
    warning LNK4049: locally defined symbol _FuncA imported
    How do I write the proper declaration?
    Note: Windows, Visual Studio 2008, Standard-C
    Last edited by kenney00100; 03-08-2011 at 02:15 AM.

  2. #2
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    If you are exporting a function, it should be in the DLL not the exe.

    Calling it from the exe is then done through the .h and .lib generated when the DLL is compiled.

    Using it inside the DLL should be a simple matter of calling it.

    EXE (i.e. programs) do not normally export functions.

  3. #3
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    Quote Originally Posted by CommonTater View Post
    If you are exporting a function, it should be in the DLL not the exe.

    Calling it from the exe is then done through the .h and .lib generated when the DLL is compiled.

    Using it inside the DLL should be a simple matter of calling it.

    EXE (i.e. programs) do not normally export functions.
    Thanks for the reply,
    I am exporting the function from the EXE just so that I can use a callback function inside the DLL. Without the __declspec(dllexport)FuncA() the function address will be unretrievable.

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