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    QString inval = ui->inputLINE->text();
    quint32 val = inval.toUInt(NULL, 16);
    QByteArray ba = inval.toLocal8Bit();
    qDebug() << ba[0];
    

char * QByteArray::data ()
Returns a pointer to the data stored in the byte array. The pointer can be used to access and modify the bytes that compose the array. The data is '\0'-terminated, i.e. the number of bytes in the returned character string is size() + 1 for the '\0' terminator.

const char * QByteArray::constData () const
Returns a pointer to the data stored in the byte array. The pointer can be used to access the bytes that compose the array. The data is '\0'-terminated unless the QByteArray object was created from raw data. The pointer remains valid as long as the byte array isn't reallocated or destroyed.
This function is mostly useful to pass a byte array to a function that accepts a const char *.
Note: A QByteArray can store any byte values including '\0's, but most functions that take char * arguments assume that the data ends at the first '\0' they encounter.

QString dataString("10245634f");
    QStringList list;
    int i = 0;
    QString tmpString;
    while(0 != (tmpString = dataString.mid(i, 2))) {
        //

        list.append(tmpString);
        i +=2;
    }

QByteArray out_val;
foreach (QString str, list) {
            uint value = str.toUInt(NULL, 16);
            out_val = (quint8)value;
        }

        QByteArray out_val;
        QString dataString(ui->inputLINE->text());
        QStringList list;
        int i = 0;
        QString tmpString;
        while(0 != (tmpString = dataString.mid(i, 2))) {
            list.append(tmpString);
            i +=2;
        }
        foreach (QString str, list) {
            uint value = str.toUInt(NULL, 16);
            out_val.append((quint8)value);
        }
        qDebug()<<out_val.toHex();
        quint32 abc;
        abc = out_val[0]+ out_val[1];
        qDebug()<<abc;

QByteArray out_val;
    QString dataString(ui->inputLINE->text());
          int i = 0;
          QString tmpString;
          while(0 != (tmpString = dataString.mid(i, 2))) {
              out_val.append((quint8)(tmpString.toUInt(NULL, 16)));
              i +=2;
          }