c++ string、UTF8相互转换方法

普通sting类型 转UTF-8编码格式字符串
涉及到的头文件：

函数所在头文件：windows.h

#include <windows.h>

wchar_t类型所需头文件：wchar.h

#include <wchar.h>

std::string ofDewarServer::string_To_UTF8(const std::string & str)
{
int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);
 
wchar_t * pwBuf = new wchar_t[nwLen + 1];//一定要加1，不然会出现尾巴
ZeroMemory(pwBuf, nwLen * 2 + 2);
 
::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen);
 
int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
 
char * pBuf = new char[nLen + 1];
ZeroMemory(pBuf, nLen + 1);
 
::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);
 
std::string retStr(pBuf);
 
delete []pwBuf;
delete []pBuf;
 
pwBuf = NULL;
pBuf = NULL;
 
return retStr;
}
//

UTF-8编码格式字符串 转普通sting类型

std::string ofDewarServer::UTF8_To_string(const std::string & str)
{
int nwLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);
 
wchar_t * pwBuf = new wchar_t[nwLen + 1];//一定要加1，不然会出现尾巴
memset(pwBuf, 0, nwLen * 2 + 2);
 
MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), pwBuf, nwLen);
 
int nLen = WideCharToMultiByte(CP_ACP, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
 
char * pBuf = new char[nLen + 1];
memset(pBuf, 0, nLen + 1);
 
WideCharToMultiByte(CP_ACP, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);
 
std::string retStr = pBuf;
 
delete []pBuf;
delete []pwBuf;
 
pBuf = NULL;
pwBuf = NULL;
 
return retStr;
}
//