How to convert float to Qbytearray in qt

[stackprogramer]

Hi, I want to copy the value a float to QByteArray, I search and found these links.
but when I convert float to QByteArray, the negative float is converted to positive float... the sign number is wrong
How can convert float to QBytearray so that the positive/negative sign is not changed...

Thanks in advance

readDataComplex.append(reinterpret_cast<const char*>(&commandOneFloat), sizeof(commandOneFloat));
readDataComplex.append(reinterpret_cast<const char*>(&commandTwoFloat), sizeof(commandTwoFloat));

link 1

[JonB]

@stackprogramer said in How to convert float to Qbytearray in qt:

the sign number is wrong

I don't know. But as per another thread recently discussed on this forum, you might try QDataStream to serialize/deserialize a float to/from a QByteArray which I presume must get it right, if you cannot resolve your direct code approach.

[anil_arise]

Try it simple:

float fNum = -78.98;
QByteArray array = QByteArray::number(fNum);
qDebug()<<"fNum "<<fNum <<"array"<<array;
float floatback = array.toFloat();
qDebug ()<<"Float "<<floatback;

Output:
fNum -78.98 array "-78.98"
Float -78.98

Details num-Qbytearray & Qbytearray-float

[JonB]

@anil_arise
If he uses your QByteArray::number() approach, @stackprogramer should be aware that converts the number to a string representation in the QByteArray. And would need parsing to convert back to a number. Not what I would do for the original question/approach, but up to him.