标准字符串std::string和System::String， CString之间的转换

.net开发中会遇到这个问题

#include <string>
#include <iostream>
using namespace std;
using namespace System;
using namespace System::Runtime::InteropServices;
//System::String转std::string
void MarshalString ( String* s, string& os ) {

const char* chars = (const char*)(Marshal::StringToHGlobalAnsi(s)).ToPointer();
os = chars;
Marshal::FreeHGlobal(IntPtr((void*)chars));
}

//System::String转std::wstring
void MarshalString ( String* s, wstring& os ) {
const wchar_t* chars = (const wchar_t*)(Marshal::StringToHGlobalUni(s)).ToPointer();
os = chars;
Marshal::FreeHGlobal(IntPtr((void*)chars));
}

//System::String转std::string
string str = "";
String* s = "abcdef";
const char* chars = (const char*)(Marshal::StringToHGlobalAnsi(s)).ToPointer();
str = s;

//std::wstring转System::String
string str = "abcdef";
String* s;
s = new String(str.c_str());

//System::String转char*;
String* s = "abcdef";
char* ch= (char*)(void*)Marshal::StringToHGlobalAnsi(s);

//System::String转char[];
char ch2[100];
strcpy(ch2,ch);