cstring 转 utf8

如果原字符是Unicode编码，使用WideCharToMultiBytes，使用UTF8代码页如果是ansi编码的则先使用MultiBytesToWideChar转换为Unicode编码，再按上述操作完成

//把utf8转成unicode，再转成cstring  

void ConvertUTF8ToANSI(char* strUTF8,CString &strANSI)  //  

{  

    int nLen = ::MultiByteToWideChar(CP_UTF8,MB_ERR_INVALID_CHARS,(LPCTSTR)strUTF8,-1,NULL,0);  //返回需要的unicode长度  

    WCHAR * wszANSI = new WCHAR[nLen+1];  

    memset(wszANSI, 0, nLen * 2 + 2);  

    nLen = MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUTF8, -1, wszANSI, nLen);    //把utf8转成unicode  

      

    nLen = WideCharToMultiByte(CP_ACP, 0, wszANSI, -1, NULL, 0, NULL, NULL);        //得到要的ansi长度  

    char *szANSI=new char[nLen + 1];  

    memset(szANSI, 0, nLen + 1);  

    WideCharToMultiByte (CP_ACP, 0, wszANSI, -1, szANSI, nLen, NULL,NULL);          //把unicode转成ansi  

    strANSI = szANSI;  

    delete wszANSI;  

    delete szANSI;  

}  

 

 

void ConvertANSIToUTF8(CString &strANSI)  

{  

int nLen = ::MultiByteToWideChar(CP_ACP,MB_ERR_INVALID_CHARS,(LPCTSTR)strANSI,-1,NULL,0);  

unsigned short * wszUTF_8 = new unsigned short[nLen+1];  

memset(wszUTF_8, 0, nLen * 2 + 2);  

nLen = MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strANSI, -1, wszUTF_8, nLen);  

  

nLen = WideCharToMultiByte(CP_UTF8, 0, wszUTF_8, -1, NULL, 0, NULL, NULL);  

    char *szUTF8=new char[nLen + 1];  

    memset(szUTF8, 0, nLen + 1);  

    WideCharToMultiByte (CP_UTF8, 0, wszUTF_8, -1, szUTF8, nLen, NULL,NULL);  

strANSI = szUTF8;  

delete wszUTF_8;  

delete szUTF8;  

}