Convert 2 bytes of raw data to qint16

[ChrisW67]

It never was hexadecimal to start with. You can use QString::number() as in my example, or QByteArray::toHex(), to display the value as a hexadecimal string.

To transfer the two bytes into a QByteArray in a little-endian byte ordering you could also use:

// No casting
qint16 value = -443; // OR  quint16 value = 65093;
QByteArray out;
out.append(value & 0xFF);
out.append((value >> 8) & 0xFF);
qDebug() << out.toHex();
 
// OR
out.resize(sizeof(value)); // Must have the space already allocated
qToLittleEndian(value, reinterpret_cast<uchar *>(out.data()));
qDebug() << out.toHex();

// No casting
qint16 value = -443; // OR  quint16 value = 65093;
QByteArray out;
out.append(value & 0xFF);
out.append((value >> 8) & 0xFF);
qDebug() << out.toHex();

// OR
out.resize(sizeof(value)); // Must have the space already allocated
qToLittleEndian(value, reinterpret_cast<uchar *>(out.data()));
qDebug() << out.toHex();

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You could do the original job without casting also:

QByteArray in("\x45\xfe", 2);
qint16 value = in.at(1) << 8 | in.at(0);
qDebug() << value << QString::number(value, 16);

QByteArray in("\x45\xfe", 2);
qint16 value = in.at(1) << 8 | in.at(0);
qDebug() << value << QString::number(value, 16);

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[Smosia]

Thank you all. That was really helpful. Topic is closed