My solution for UTF-8

[kazi]

//////////////////////////////////////////////////////////////////////////
//    kazi add here [8/26/2004-18:48]

std::string Transcode(const wchar_t *pwszString, unsigned int nCodePage /* = CP_UTF8 */)
{
    std::string strRet;
    int nReqLen = WideCharToMultiByte(nCodePage,0,pwszString,wcslen(pwszString),0,0,0,0); // max possible length of converted 8bit string

    char *pszDst = new char[nReqLen + 1];

    // get string
    int nLen = WideCharToMultiByte(nCodePage,0,pwszString,wcslen(pwszString),pszDst,nReqLen,0,0);

    if (nLen){
        pszDst[nLen] = 0; // null terminator
        strRet = pszDst; // copy to STL string
    } // if (nLen)

    delete[] pszDst; // delete, if allocated

    return strRet;
}

std::string Transcode(const char *pwszString, unsigned int nCodePage /* = CP_ACP */)
{
    std::string strRet;
    int nReqLen = MultiByteToWideChar( nCodePage, 0, pwszString,
        strlen(pwszString)+1, 0, 0 );

    // allocate buffer
    wchar_t *pszDst = new wchar_t[nReqLen + 1]; //initially, point to array

    // get string
    //int nLen = MultiByteToWideChar(nCodePage,0,pwszString,nRawLen,pszDst,nReqLen);
    int nLen = MultiByteToWideChar( nCodePage, 0, pwszString,
        strlen(pwszString)+1, pszDst, nReqLen );

    if (nLen){
        pszDst[nLen] = 0; // null terminator
        //strRet = pszDst; // copy to STL string
        strRet = Transcode( pszDst, nCodePage == CP_ACP ? CP_UTF8 : CP_ACP ); // copy to STL string
    } // if (nLen)

    delete[] pszDst; // delete, if allocated
    return strRet;
}
/////////////////////////////////////////////////////

//i use the function like this:
// Set string value:
item.SetAttribute( "Name", Transcode("服务器任务") .c_str() );
// Read string value:
strcpy( szTmp, Transcode( pEle->Attribute("Name"), CP_UTF8 ).c_str() );

//////////////////////////////////////////////////////////////////////////
I think you can try this methord.