将.NET System::String转换为std::string

#include <string>
#include <msclr/marshal.h>

using namespace System;
using namespace System::Runtime::InteropServices;
using namespace msclr::interop;

std::string ConvertSystemStringToStdString(System::String^ str)
{
    const char* chars = (const char*)(Marshal::StringToHGlobalAnsi(str)).ToPointer();
    std::string result(chars);
    Marshal::FreeHGlobal(IntPtr((void*)chars));
    return result;
}

System::String^ dotNetString = "Hello, World!";
std::string stdString = ConvertSystemStringToStdString(dotNetString);