making a dll

This is a discussion on making a dll within the C++ Programming forums, part of the General Programming Boards category; Hello, i'm trying to figure out how to make a dll that can be used by a diffrent program that ...

  1. #1
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    Question making a dll

    Hello,

    i'm trying to figure out how to make a dll that can be used by a diffrent program that is writion in a diffrent programming langwich i have had alook round the internet but i cna find how to do it.

    btw i'm useing dev-c++
    Last edited by MK4554; 04-04-2006 at 02:38 PM.

  2. #2
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    You'll then need to use LoadLibrary() and GetProcAddress(). There might be other ways but this is how I would do it; google them.
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

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    erm yeh thats how you load the dll into another program but i'm trying to also figgure out how to make it becuse i used dev-cpp dll and i couldnt get it to work btw i was trying to include it to vb6


    thanks
    1 or 0, Alive Or Dead!
    -------------------------
    OS: Windows XP
    Complier: MinGW
    IDE: Dev-cpp

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    you have to surround all the functions with extern "C" to prevent the compiler from mangling the names
    Code:
    #ifdef _cplusplus
    extern "C" {
    #endif
    // your code here
    #ifdef _cplusplus
    }
    #endif
    Or just simply put the functions in a *.c file so that it gets compiled as C and not C++.

    Don't forget to export the symbols

    For more information google for Mixed Language Programming
    Last edited by Ancient Dragon; 04-04-2006 at 03:07 PM.

  5. #5
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    ok thanks thats helpful but can anyone show me what a basic dll looks like so i know my one is right?
    1 or 0, Alive Or Dead!
    -------------------------
    OS: Windows XP
    Complier: MinGW
    IDE: Dev-cpp

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    A basic dll has only one function -- DllMain() which is similar to main() in a normal C/C++ program. And you compiler will generate the code for that. You will want to manually create a header file that contains the prototypes of the functions you want to export. This is for other C/C++ programs that will use your dll, but won't probably need it for VB6. I don't know how you will declare the function in VB6.

    This will export one function -- foo().

    Code:
    // This is the C source file
    // includes here
    #include <all includes here>
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    __declspec( dllexport ) int foo()
    {
       return 0;
    
    }
    #ifdef __cplusplus
    }
    #endif
    Last edited by Ancient Dragon; 04-04-2006 at 04:41 PM.

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