How can I use the value(QByteArray) of one class in another?

[ChristianMontero]

Hi, Good night
I'm making a project in QT, and I have two classes, one that stablish a connection via UDP between 2 devices to send and recieve data, this data it's stored in a QByteArray and the other class it's call Window, and it's where I designed the GUI and I have an array of labels where i want to show the value of the QByteArray recieved by the UDP connection, how can I get acces to this value?

Any help would be appreciated
Thanks for your time!

[qxoz]

@ChristianMontero
are those classes related somehow?
First coming to mind is using signal-slots. But if data is big you can use pointers or references.

[ChristianMontero]

@qxoz yeah, they're related, give me a second to include part of the code, please.

[ChristianMontero]

This is MyUDP.h

where I declared the QByteArray buffer as public, the in MyUDP.ccp i use it like this:
`
Then in my Window class I want to get acces to that value to print it in a QLabel, something like this:

[qxoz]

@ChristianMontero
It is not clear to me now.
Do you have problem with access to MyUDP object or updating when new data comes?
Where do you create MyUDP object?

[ChristianMontero]

@qxoz I want to create an instace of MyUDP in my window.cpp
and there I want to check te value of the buffer and print the value of each bit in an array of buttons, something like this:

in the message recieved there will the de number (0/1) of output where I should print the value

[Diracsbracket]

If you are sure the instance in your UDP class remains alive, and if you declare a
pointer to the QByteArray as a member of that class,

QByteArray*     m_data;

Then you should be able to define a signal like this for that class:

signals:
     void dataAvailable(const QByteArray& data);

and emit it as follows after filling the byte array and storing its pointer in m_data

m_data = m_file->readData(filename);
emit dataAvailable(*m_data);

In your Window class, you can connect that signal to a slot, e.g.

public slots:
  void handleData(const QByteArray& data);

In there, you can access the data as follows:

QByteArray* dataArray = (QByteArray*)&data;
//... do your stuff with dataArray

This should work, no?

[qxoz]

@ChristianMontero
If you want show bits, you can convert QByteArray to QBitArray and use it:

QByteArray bytes = ...;
 
// Create a bit array of the appropriate size
QBitArray bits(bytes.count()*8);
 
// Convert from QByteArray to QBitArray
for(int i=0; i<bytes.count(); ++i)
    for(int b=0; b<8; ++b)
        bits.setBit(i*8+b, bytes.at(i)&(1<<b));

[ChristianMontero]

@Diracsbracket I think it should, let me try it, thanks you so much for your time!