字符集转换: Ansi

    字符集转换: Ansi - Unicode

wstring AnsiToUnicode (const string& strSrc )
{
    /*!< 分配目标空间 */
    int iAllocSize = MultiByteToWideChar(CP_ACP,0,strSrc.c_str(),-1,NULL,NULL);
    WCHAR* pwszBuffer = new WCHAR[ (UINT)iAllocSize ];
    if ( NULL == pwszBuffer )
    {
        return L"";
    }    
    int iCharsRet = MultiByteToWideChar( CP_ACP, 0, strSrc.c_str(),-1,pwszBuffer, iAllocSize );
    /*!< 成功 */
    wstring wstrRet;
    if ( 0 < iCharsRet )
    {
        (void)wstrRet.assign ( pwszBuffer, static_cast<size_t>( iCharsRet ) );
    }

    /*!< 释放内存 */
    delete[] pwszBuffer;

    return wstrRet;
}