strange hexadecimal representation

[r3d9u11]

Hi. I have a strange hexadecimal representation when I'm trying to display it to console:

...
sout << endl << "Request: ";
for (int i = 0; i < request.size(); i++)
    sout << " 0x" << QString::number(request[i], 16);
sout << endl;
...

two last value are evaluating by code:

...
uint16_t u16 = getU16();
package.append(char(u16));
package.append(char(u16 >> 8));
...

Data of request in debugger:

Output:

Why not just a "0xd1" and "0xfb" ?
Why extra "ffffffffffffff" are displaying ?

What I'm doing wrong?
Thanks!

[sierdzio]

You can simply use QByteArray::toHex().

Regarding the extra fs - I don't know. Maybe it is a bug in Qt.

[jsulm]

@r3d9u11 said in strange hexadecimal representation:

Why extra "ffffffffffffff" are displaying ?

I guess because it's signed and negative and its converted to long when it is passed to QString::number

[J.Hilk]

@r3d9u11 said in strange hexadecimal representation:

Why extra "ffffffffffffff" are displaying ?

QString::number probably makes an implicit cast. However 16bytes seems unusual

[JKSH]

@jsulm said in strange hexadecimal representation:

@r3d9u11 said in strange hexadecimal representation:

Why extra "ffffffffffffff" are displaying ?

I guess because it's signed and negative and its converted to long when it is passed to QString::number

https://bugreports.qt.io/browse/QTBUG-53706

[r3d9u11]

@sierdzio In my current case I should to process each elements of BytesArray, however thank for useful hint (I think I will use it in future).

[r3d9u11]

@JKSH thanks!

[r3d9u11]

thank to all for hints and clarifications!