I think I’m a kind of at a loss here. I trying such a simple thing, I can’t believe that there is nothing build-in Qt (using Qt 5.6.2). I try to convert the data inside a QByteArray from big endian to little endian. Always starts with the same test QByteArray like this.
QByteArray value;
value.append(0x01);
value.append(0x02);
value.append(0x03);
qDebug() << "Original value is: " << value.toHex(); // “010203” like expected
What I need is the little endian, which means the output should be “030201”. Is there any build in thing so far in the Qt Framework? I don’t find one. What I tried so far
// Try with build in QtEndian stuff
QByteArray test = qToLittleEndian(value);
qDebug() << "Test value is: " << test.toHex(); // 010203
// Try via QDataStream
QByteArray data;
QDataStream out(&data, QIODevice::ReadWrite);
out.setByteOrder(QDataStream::LittleEndian);
out << value;
qDebug() << "Changed value is: " << data.toHex(); // "03000000010203"
Any good idea? Or do I really need to shift hands by hand? Found nothing helpfull on SO or on google or maybe ask the wrong question...
It sounds like you want to reverse the array, rather than manipulate the endianness of any of the multi-byte types inside the array. The standard library has a solution for this:
QByteArray arr;
std::reverse(arr.begin(), arr.end());
// arr is now in reversed order