CODEWITHSUNDEEP
qt
oqrxke
oqrxke

Reputation: 351

Construct a QByteArray from a HEX value entered as a QString

If QString str = "0xFFFF", how to turn this text representation of an hex into a QByteArray? In the end, I would like to have the same of what I get from the following:

QByteArray ba;
ba.resize(2);
ba[0] = 0xFF;
ba[1] = 0xFF;

Upvotes: 5

Views: 13311

Answers (1)

BaCaRoZzo
BaCaRoZzo

Reputation: 7692

In either case the final QByteArray would be a sequence of hex values, i.e. FFFF. Conversion should be applied on that string. Given that, if your input string is provided prepended with the 0x, you should get rid of it via mid().

Here is a code snippet which compares the results of the two approaches: manually filling the QByteArray with hex values or converting hex values from a QString:

QByteArray array1;
array1.resize(2);
array1[0] = 0xFF;
array1[1] = 0xFF;

QString str = "0xFFFF";   
QString value =  str.mid(2);    // "FFFF"   <- just the hex values!
QByteArray array2 = QByteArray::fromHex(value.toLatin1());  

qDebug() << array1;             // not printable chars 
qDebug() << array2;

qDebug() << array1.toHex();     // to have a printable form use "toHex()"!
qDebug() << array2.toHex();

Upvotes: 5

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