// CLR.Dll.h

#pragma once

#include "string.h"

using namespace System;

using namespace System::Runtime::InteropServices;

namespace CLRDll {

    public ref class DllClass

    {

    public:

        String^ FunctionTest(String^ input)

        {

            char* inputChar = ManagedString2UnmanagedStringA(input);

            //call native c++ function...

            inputChar[0] = 'A';

            String^ result = UnmanagedStringA2ManagedString(inputChar);

            return result;

        }

    private:

        //将?非?托D管ü的?ANSI字?符?串?转a换?成é托D管ü字?符?串? 

        String^ UnmanagedStringA2ManagedString(char* pIn)

        {

            return Marshal::PtrToStringAnsi(static_cast<IntPtr>(pIn));

        }

        //将?托D管ü字?符?串?转a换?成é非?托D管ü的?ANSI字?符?串? 

        char* ManagedString2UnmanagedStringA(String^ strIn)

        {

            IntPtr ip = Marshal::StringToHGlobalAnsi(strIn);

            const char* pTemp = static_cast<const char*>(ip.ToPointer());

            char *pOut = new char[strlen(pTemp)+1];

            strcpy(pOut, pTemp);

            Marshal::FreeHGlobal(ip);

            return pOut;

        } 

    };

}

public void RunTest()

{

    DllClass curDllClass = new DllClass();

    string input = "test";

    string output = curDllClass.FunctionTest(input);

}