Unicode下wstring(wchar_t*)和string(char*)互相转换

#include<string>
using namespace std;

//将string转换成wstring
wstring string2wstring(string str)
{
	wstring result;
	//获取缓冲区大小，并申请空间，缓冲区大小按字符计算
	int len = MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), NULL, 0);
	TCHAR* buffer = new TCHAR[len + 1];
	//多字节编码转换成宽字节编码
	MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.size(), buffer, len);
	buffer[len] = '\0';				//添加字符串结尾
	//删除缓冲区并返回值
	result.append(buffer);
	delete[] buffer;
	return result;
}

//将wstring转换成string
string wstring2string(wstring wstr)
{
	string result;
	//获取缓冲区大小，并申请空间，缓冲区大小事按字节计算的
	int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
	char* buffer = new char[len + 1];
	//宽字节编码转换成多字节编码
	WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
	buffer[len] = '\0';
	//删除缓冲区并返回值
	result.append(buffer);
	delete[] buffer;
	return result;
}