如何从c＃返回列表，并使用它在vc ++通过com

如何从c＃方法返回列表并使用c ++中的列表返回值可以指导如何做？

我将按照以下方式完成整个场景：

How to return List from c# method and Use the List return values in c++ can u give guidance how to do it??
I going like following way my complete scenario:

在c＃DemoLib.cs

in c# DemoLib.cs

usng System;using System.Collections.Generic;

public interface IDiscover
{
  void GetList1();
  String GetList2();
  List<string> GetList3();
};

namespace DemoLibrary

{

  class DemoLib
 {
   public void GetList1()
   {

    Console.WriteLine(" I am from Void GetList()");

   }
   public string GetList2()
   {

    Console.WriteLine(" I am from string GetList()");

    return "Stack OverFlow";

   }

   public List<string> GetList3()
   {

    List<string> li=new List<string>();

    li.Add("India");
    li.Add("America");
    li.Add("London");

     Console.WriteLine(" I am from List<string> GetList()");

    return li; 
   }

已成功构建并创建DemoLib.dll

Build successfully and created DemoLib.dll

我将DemoLib.dll复制到c：\DemoLib.dll，并使用regasm在c：\

I copy the DemoLib.dll to c:\DemoLib.dll and using regasm created Demolib.tlb in c:\

i Hav main（）

Now in Vc++ i Hav main()

DemoLibMain.vc ++

DemoLibMain.vc++

#include<list>

#include<stdio.h>

void main()
{

   HRESULT Hr=CoInitialize(NULL);

  IDiscoverPtr Iptr(__uuidof(DemoLib));

   Iptr->GetList1();

  std::string str=Iptr->GetList2();

  printf("%s",str); //dispalys "null" insted of "stack overflow" but when i debugging it 

                     shows the value "stack overflow" at str.

Iptr - >（Afraid，因为它没有给GetList3（））

Iptr->(Afraid since it doesnot give GetList3() )

当我强制写Iptr-> GetList3（）它显示错误为

when i forced to write Iptr->GetList3() it Display the error as

GetList3不是成员of IDiscover;

GetList3 is not a member of IDiscover;