How to convert a quint32 to QByteArray without leading 00?

[Infinity]

I have a quint32 with the value of 43. Now I would like to convert it to a QByteArray. I tried it like this:

quint32 newChainIdInt = 43;

QByteArray newChainIdArray;
QDataStream stream(&newChainIdArray, QIODevice::WriteOnly);
stream << newChainIdInt;

qDebug() << newChainIdArray.toHex(' ');

I get the following output:

00 00 00 2b

I need to have it without leading 00 00 00. It should look like this:

2b

How can I do this?

[KroMignon]

@Infinity said in How to convert a quint32 to QByteArray without leading 00?:

How can I do this?

Cast the value to an char:

uint32 newChainIdInt = 43;

QByteArray newChainIdArray;
QDataStream stream(&newChainIdArray, QIODevice::WriteOnly);
stream << quint8(newChainIdInt);

[Infinity]

@KroMignon Thanks. What if the value would be greater than a quint8?

[KroMignon]

@Infinity said in How to convert a quint32 to QByteArray without leading 00?:

What if the value would be greater than a quint8?

It will be lost, of course!
You can also remove zero from QByteArray:

uint32 newChainIdInt = 43;

QByteArray newChainIdArray;
QDataStream stream(&newChainIdArray, QIODevice::WriteOnly);
stream << newChainIdInt;
while(newChainIdArray.size() > 1 && newChainIdArray[0] == 0)
    newChainIdArray.remove(0);
qDebug() << newChainIdArray.toHex(' ');

[mcleary]

I use the following piece of code

double value = 43;
QByteArray byteArray{ reinterpret_cast<char*>(&value), sizeof(value) };

This should work for anything that is contiguous in memory.