How do I return a string array in c# and use it in unmanaged c++?

Question

Can any one tell me how to return a String array from a method and use it in c#?

Suppose i have to return an array of {one,two, .....ten} and in c++ i have to display this array on console and perform some actions.

How is this significantly different from this one stackoverflow.com/questions/1032060/…? — sharptooth
– sharptooth, Commented Jun 24, 2009 at 11:30
He is asking it for the third time now... stackoverflow.com/questions/1036720/… — Aamir
– Aamir, Commented Jun 24, 2009 at 11:49
But i am looking for the way to return strings and use them on main () but in previous it is list here a string array — Cute
– Cute, Commented Jun 24, 2009 at 12:36

Preet Sangha · Accepted Answer · 2009-06-24 12:04:04Z

1

See here for an example: http://haroonsaeed.wordpress.com/2006/08/11/interop-managed-c-and-c/

not done it my self but at a guess:

in C# create assembly called csharpassembly.dll with the following class

using System;
namespace Csharpassembly  {
 public class CSharpClass {
   public static string[] GetStrings() { 
    return new string[] {"1", "2", "3"}));
   }
 }
}

But in your case. Have an assembly that creates the array in c# and havea mC++ program reference this assembly and call it:

#include "stdafx.h"

#using <mscorlib.dll>
#using "csharpassembly.dll"

using namespace System;
using namespace Csharpassembly 

__gc class Test {
public:

    static void ProcessCShaperStrings()     {
        array^ stringArray = CSharpClass::GetStrings();
        Console::WriteLine(stringArray [0]); ...
        // etc

    } 
};
int wmain(void) { 
    Test:: ProcessCShaperStrings();    
    return 0;
}

edited Jun 24, 2009 at 12:04

answered Jun 24, 2009 at 11:26

Preet Sangha

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4 Comments

sharptooth Over a year ago

That's about C# and managed C++ and the OP asks about C# and unmanaged C++.

mezoid Over a year ago

That blog post seems to be a very good answer in my view. Is it possible for you to detail in your answer a little of what is explained in the blog post? That way your answer will still be helpful if haroon saeed's blog ever becomes unavailable.

mezoid Over a year ago

@sharptooth the OP doesn't really indicate whether he is referring to managed or unmanaged C++

Preet Sangha Over a year ago

There is always going to be interop. Why not just take the above example and populate a unmanaged datum in ProcessCShaperStrings(). Then the main() above could renamed to return this datum which you consume in an unmanaged consumer.

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