creating a dll in visual C++ class library to import in to visual C# console appl.
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Thread: creating a dll in visual C++ class library to import in to visual C# console appl.

  1. #1
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    creating a dll in visual C++ class library to import in to visual C# console appl.

    the class library name is simple
    the header file is simple .h

    //simple.h
    #pragma once
    using namespace System;
    namespace simple
    {
    public class class1
    {
    public:
    int addition(int x, int y);

    };
    }

    the simple.cpp is

    #include "stdafx.h"

    #include "simple.h"
    int addition(int x, int y)
    {
    return x+y;
    }

    then i created Visual C# console app
    name dlltest
    /program.cs

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Runtime.InteropServices;

    namespace dlltest
    {
    class Program
    {

    static void Main(string[] args)
    {
    simple.class1 myobject = new simple.class1.addition();
    Console.Write("the sum is:{0} ",myobject.addition(2,3));
    }
    }
    }
    simple.dll added in references while debugging i'm getting errors


    C:\Users\admin\Documents\Visual Studio 2008\Projects\dlltest\dlltest\Program.cs(19,56): error CS0426: The type name 'addition' does not exist in the type 'simple.class1'

    C:\Users\admin\Documents\Visual Studio 2008\Projects\dlltest\dlltest\Program.cs(20,60): error CS1061: 'simple.class1' does not contain a definition for 'addition' and no extension method 'addition' accepting a first argument of type 'simple.class1' could be found (are you missing a using directive or an assembly reference?)



    please help me to resolve this error.

  2. #2
    VictorN's Avatar
    VictorN is online now Super Moderator Power Poster
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl

    Your code in not a Visual C++ one. Perhaps, it is a managed C++ which is discussed in another Forum.
    Victor Nijegorodov

  3. #3
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl


  4. #4
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl

    then i created Visual C# console app
    Your code is c# - not c++ which is the topic of this forum.

    Moderator, please would you move this thread.
    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

  5. #5
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl

    Quote Originally Posted by kanak View Post
    the simple.cpp is

    Code:
    #include "stdafx.h"
    
    #include "simple.h"
    int addition(int x, int y)
    {
        return x+y;
    }
    Your C++/CLI code snippet above (I added code tags, please always use them when posting code), when placed in the usual way in a .cpp implementation file, defines a free function, i.e. one that is not associated to any class. To define a class member function, which seems to be your intention, you'd need to explicitly specify the class name, so your function's header would need to look something like this instead:

    Code:
    int class1::addition(int x, int y)
    This looks more like a C++/CLI syntax issue than anything else. Things like that are discussed in the separate C++/CLI section. Additionally, there's hardly ever a reason to use C++/CLI in a managed project unless interop (i.e. combining managed with native code) is involved (or it's a pure C++/CLI project, but then no C# would be involved, of course). This suggests you actually may be going into interop (though there's no actual trace if that in your OP); and that has been discussed in the C++/CLI section quite some times as well, so you may also find helpful information about that there too.
    I was thrown out of college for cheating on the metaphysics exam; I looked into the soul of the boy sitting next to me.

    This is a snakeskin jacket! And for me it's a symbol of my individuality, and my belief... in personal freedom.

  6. #6
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl

    Quote Originally Posted by Eri523 View Post
    Code:
    int class1::addition(int x, int y)
    I would say,
    Code:
    int simple::class1::addition(int x, int y)
    or
    Code:
    namespace simple {
       int class1::addition(int x, int y)
       {
       . . .
       }
    }
    Besides,
    Code:
    namespace simple
    {
        public ref class class1
        {
        public:
            int addition(int x, int y);
    
        };
    }
    Best regards,
    Igor

  7. #7
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    Re: creating a dll in visual C++ class library to import in to visual C# console appl

    Quote Originally Posted by Igor Vartanov View Post
    I would say,
    Code:
    int simple::class1::addition(int x, int y)
    Oh, you're right of course. I always have a using directive referring to the enclosing namespace right after the #includes in my implementation files. (In the context of the OP's code that would be using namespace simple;) Carelessly, I assumed one silently in the OP's code as well.

    Thanks for correction.
    I was thrown out of college for cheating on the metaphysics exam; I looked into the soul of the boy sitting next to me.

    This is a snakeskin jacket! And for me it's a symbol of my individuality, and my belief... in personal freedom.

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