Creating my own library

This is a discussion on Creating my own library within the C Programming forums, part of the General Programming Boards category; Hello all In my project I need to create libraries out of a few of my modules. So I tried ...

  1. #1
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    Creating my own library

    Hello all

    In my project I need to create libraries out of a few of my modules.

    So I tried practicing library-making in the most basic way:
    (Im working with visual c++)

    1> I created a new project ->win 32 static library (lets call it test)
    2>I added one of my modules to it (lets call it Mod.c ) using the project->addtoProject->files

    3>I compiled and performed build via build->build test.lib

    4>I then added the path to test.lib (under the Debug library) in my main project (by going to project->settings->link panel->object/library Modules)


    When performing build to my main project, the following link error appears:
    LNKI2001 Unresolved External Symbol Winmain@16


    Please help me, and if possible, guide me step by step , as I've been trying very hard with no luck, and am becominbg desperate.


    Thanks a bunch!

    gozlan
    And if you get no joy from music hall
    Remember there is always alcohol
    And If you get no joy from Gin
    Here is the abyss jump in

  2. #2
    Banned Troll_King's Avatar
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    Couldn't you just put all of the library declarations and prototypes into a header file than define the functions and variables in a source file. Lastly include the header file in your main file.

  3. #3
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    no. I was specifically asked to create libraries out of each and every module.

    Working with Source and Header files is the way I usually work.

    I know I'm missing a small detail from the procedure of creating my own library and am hoping it would ring a bell to someone here.
    And if you get no joy from music hall
    Remember there is always alcohol
    And If you get no joy from Gin
    Here is the abyss jump in

  4. #4
    Banned master5001's Avatar
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    Originally posted by Troll_King
    Couldn't you just put all of the library declarations and prototypes into a header file than define the functions and variables in a source file. Lastly include the header file in your main file.
    Do what Troll_King said. Instead of asking you if you can I'm going to tell you to do it. You are trying to make something harder than it actually is.

    [edit]
    Aside from the other advise I need a bit more information. Are you trying to compile your library and your executable at the same time? Also are you letting your compiler know that you are building a library and not an executable. Maybe that is your problem.
    [/edit]
    Last edited by master5001; 10-14-2002 at 03:58 PM.

  5. #5
    bobish
    Guest
    >>no. I was specifically asked to create libraries out of each and every module.

    this would imply that gozlan is doing this for work or as a homework assignment, meaning it has to be done that way.

  6. #6
    Banned master5001's Avatar
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    Good point. The bad news is that I refuse to help people with stupid homework assignments. I have never had to do what he is doing EVER. But he should still check on what the compiler is doing. I have a feeling that compiler is not aware that it is not compiling an exe (hense the warning about missing main/WinMain) so he should start there. ....mumble, mumble... stupid, useless assignments...mumble

  7. #7
    Guest Sebastiani's Avatar
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    Perhaps you could add main to the compiled lib as an entry point. When I compile DLL's you have to include a special main function to handle the function calls. This makes sense since the linker must know where to start resolving external symbols/references....
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

  8. #8
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    well, you are al right of course, but yes- its stupid hoemwork,Worse than that, its a project Ive been working on for a few months, and I dont feel like becoming erbeliant near the end.

    I did find out that when creating my project as a win 32 console application, there is no problem, but when doing so in win32 application ( again, as I was asked)- then I have a problem.


    And yes, i am building it as lib, not as exe.


    Is there a different procedure for including in a win32 application (not console)?
    And if you get no joy from music hall
    Remember there is always alcohol
    And If you get no joy from Gin
    Here is the abyss jump in

  9. #9
    Guest Sebastiani's Avatar
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    Dunno, but you might try this (perhaps futile) idea...

    BOOL APIENTRY
    DllMain ( HINSTANCE, DWORD, LPVOID )
    {
    return 1;
    }


    or:


    int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
    {
    return 1;
    }
    Code:
    #include <cmath>
    #include <complex>
    bool euler_flip(bool value)
    {
        return std::pow
        (
            std::complex<float>(std::exp(1.0)), 
            std::complex<float>(0, 1) 
            * std::complex<float>(std::atan(1.0)
            *(1 << (value + 2)))
        ).real() < 0;
    }

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