将std::string传递给与C# DLL一起使用的C++ dll

// C++ DLL中的代码
extern "C" __declspec(dllexport) int GetStringLength(const char* str)
{
    std::string inputString(str);
    return inputString.length();
}

// C#中的代码
using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("YourCppDllName.dll")]
    public static extern int GetStringLength(string str);

    static void Main()
    {
        string inputString = "Hello, World!";
        int length = GetStringLength(inputString);
        Console.WriteLine("Length of the string: " + length);
    }
}