Using a C++ DLL with C#
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  1. #1
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    Using a C++ DLL with C#

    I have a 3rd party dll written in VC6.0 that I want to use within a C# application. When I call one of the exported functions I get a can't find entry point exception.

    The dll is called diodrv.dll and there are 4 exported functions. Dumpbin and Depends both report this:

    File Type: DLL

    Section contains the following exports for diodrv.dll

    ordinal hint RVA name

    1 0 00001110 ?CloseDio@@YGXXZ
    2 1 00001040 ?CreateDio@@YGKXZ
    3 2 00001080 ?ReadDioReg@@YGKK@Z
    4 3 000010D0 ?WriteDioReg@@YGXKK@Z

    I have the source code and VC6 project for the dll. The function definitions are like this:
    Code:
    #define DIODRV_API __declspec(dllexport)
    
    DIODRV_API DWORD __stdcall CreateDio(void);
    My C# for importing the functions is this:

    Code:
    [DllImport("diodrv.dll")]
    static extern Int32 CreateDio();
    What's the best way to get access to these functions?

    Thanks

  2. #2
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    Re: Using a C++ DLL with C#

    This isn't really my area but you might try setting ExactSpelling to false. See http://msdn.microsoft.com/en-us/library/7b93s42f.aspx
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  3. #3
    Arjay's Avatar
    Arjay is offline Moderator / MS MVP Power Poster
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    Re: Using a C++ DLL with C#

    The name mangling is messing you up.

  4. #4
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    Re: Using a C++ DLL with C#

    Quote Originally Posted by Arjay View Post
    The name mangling is messing you up.
    OK.. Is there some way to rebuild the dll such that the names aren't mangled?

  5. #5
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    Arjay is offline Moderator / MS MVP Power Poster
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    Re: Using a C++ DLL with C#

    Quote Originally Posted by Dave C View Post
    OK.. Is there some way to rebuild the dll such that the names aren't mangled?
    I would use a .def file.

    http://msdn.microsoft.com/en-US/libr...(v=vs.80).aspx

  6. #6
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    Re: Using a C++ DLL with C#

    Thank you Arjay - the DEF file worked.

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