QDataStream default LittleEndian

[OPit]

Hi,
till today, use QDatastream was not a problem, it writes data in BigEndian by default.
But I want to create a binary file and Qt write it in LittleEndian format. And if I force it with setByteOrder(QDataStream::BigEndian), it keeps LittleEndian format.

Someone has already this problem ?

QFile f("D:/Temp/camera.dat");
f.open(QIODevice::WriteOnly);
QDataStream str(&f);
str.setByteOrder(QDataStream::BigEndian);
int test = 1080;
str.writeRawData(reinterpret_cast<char*>(&test), sizeof(int));
f.close();

I use W11 and Qt 6.4.2

Thanks

[jsulm]

@OPit said in QDataStream default LittleEndian:

str.writeRawData(reinterpret_cast<char*>(&test), sizeof(int));

Why don't you do instead:

str << test;

?
There is no byte order for a byte array.

[OPit]

This post is deleted!

[OPit]

@jsulm Oh thank you. I believed Qt was adding pseudo data when use << .

Perfect, it's resolved (even if I don't know why LittleEndian is always used with writeRawData)

[jsulm]

@OPit said in QDataStream default LittleEndian:

why LittleEndian is always used with writeRawData

Because writeRawData writes a bunch of bytes and byte order is not relevant for it. Byte order is only relevant for things like integers, floats, ... (for data types bigger than one byte).