Thread: DLL __cdecl doesnt seem to work?

  1. #1
    Registered User Xei's Avatar
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    DLL __cdecl doesnt seem to work?

    I am currently having problems with a DLL, the DLL will work fine in C++ however I am trying to make the DLL portable with VB so that my friends can use the DLL's made in C++ when they just need the power that VB cannot assign. Currently I am working with a Dynamic Linked Library, not Static. Im using the __declspec(dllexport) definition. I checked MSDN and they said that VB always uses __cdecl for API calling convention. However the DLL will run just fine in VB until the DLL has to return a value, then it all just crashes and the DLL doesnt get shut down etc.. I have tried adding the compile option Gd, and Gz (both seperate compiles ofcourse) and VB still gives the "Bad DLL Calling Convention" error, I am not quite sure what I am doing wrong in the DLL, here is a sample of what Im putting in the header file:
    Code:
    #ifdef __cplusplus
    #define EXPORT extern "C" __declspec (dllexport)
    #else
    #define EXPORT __declspec (dllexport)
    #endif
    
    EXPORT int TestB(char *Say);
    It's just a silly sample DLL that i've been working with to try to get it working with VB properly. "void" functions work perfectly, its when they have to return a value when it doesnt work properly.

  2. #2
    "The Oldest Member Here" Xterria's Avatar
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    wha'd are you on drugs?

    you can't make a dll using c++ and use it with vb without linking it to MSVBVM60.dll

    thus your way will not work, as MSVBVM60.dll accepts only cdecl statements specifically made by a microsoft devleoper(as in, the people in the company)compiler which is meant to make vb libraries, or made by vb professional itself

    i tried to find a solution but i couldn't. i'm still looking

  3. #3
    I lurk
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    No, you're wrong. A quick search on google came up with: http://www.vsj.co.uk/archive/hovb-9905.asp

  4. #4
    C++ Developer XSquared's Avatar
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    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

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  5. #5
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    Thumbs up Thankyou

    Thankyou Eibro and XSquared, the websites that you provided have been useful in assisting me create the DLL's compatible and taught me a couple other useful things.

  6. #6
    "The Oldest Member Here" Xterria's Avatar
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    aren't you going to thank me too? i'm the one who made people actually research

  7. #7
    Registered User Xei's Avatar
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    Wink Okay...

    Yes.... thanks

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