Qt 16进制字符串跟QByteArray互转

/* 
 * @breif 将16进制字符串转换为对应的字节序列
 */
QByteArray MainWindow::HexStringToByteArray(QString HexString)
{
    bool ok;
    QByteArray ret;
    HexString = HexString.trimmed();
    HexString = HexString.simplified();
    QStringList sl = HexString.split(" ");

    foreach (QString s, sl) {
        if(!s.isEmpty())
        {
            char c = s.toInt(&ok,16)&0xFF;
            if(ok){
                ret.append(c);
            }else{
                qDebug()<<"非法的16进制字符："<<s;
                QMessageBox::warning(0,tr("错误："),QString("非法的16进制字符: "%1"").arg(s));
            }
        }
    }
    qDebug()<<ret;
    return ret;
}

QString MainWindow::ByteArrayToHexString(QByteArray data){
    QString ret(data.toHex().toUpper());
    int len = ret.length()/2;
    qDebug()<<len;
    for(int i=1;i<len;i++)
    {
        qDebug()<<i;
        ret.insert(2*i+i-1," ");
    }

    return ret;
}