Problems Accesing a List of QByteArray

NicolasKsi

Hi everyone! Im having kind of a basic problem.
I have a list of QByteArray. I want to populate this list, byte by byte.

This is an example of how I create my list

QList<QByteArray> List;
QByteArray Array1,Array2,Array3;
List.append(Array1);
List.append(Array2);
List.append(Array3);

How i Usually populate a single QByteArray

QByteArray Test;
unsigned char a=0x55;
Test.append(a);

So far so good. Now i want to append a byte to a QByteArray thats contained in my list.

QList<QByteArray> List;
QByteArray Array1,Array2,Array3;
List.append(Array1);
List.append(Array2);
List.append(Array3);

unsigned char a=0x55;
List.at(1).append(a);

What im trying to do, is to my Array2 (The one that is placed on position 1 of List) append the byte a (that contains 0x55)

The following error code appears:

passing 'const QByteArray'as 'this' argument of 'QByteArray& QByteArray::append(char)' discards qualifiers [-fpermissive]

If i change it to this (which i consider kind of the same)

((QByteArray)List.at(1)).append(a);

The program compiles, but it doesnt work, no result after that line.

If i place the mouse over the List.at(1) part, the sign QByteArray Appears. so calling List.at(1) returns a QByteArray..., Then why cant i append a byte to that QByteArray?
Thanks in advance!

luca

QList::at() returns a const reference so you can't modify it.

You should use:

List[1].append(...) ;