c++ string、UTF8相互转换方法

本是古典何须时尚 2021-07-26 13:03 624阅读 0赞

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;
    }
    //