How Can i get array in another class

[CP71]

@dziko147
Here you are not passing a pointer but you are creating a new instance of class

[CP71]

@dziko147
Sorry, but my English is no good.
So maybe I can help you with an example.

To link my example.
I think you are filling your array in obj1, but when you try to read it you use obj2.
You that know your project, have a sense what I write?

In short, these are possible ways to have your result:

• two or more instance of you class
• your object never fills the array
• your object fills the array but with an empty value
• in somewhere of your class clear your array before you use it

But in your case seems you have two instances of class

[Pl45m4]

@dziko147

Now that I understand a bit more, I think the only issue here is that you dont click that button that will fill your array before you try to access the elements.

You fill your array here:

void UploadCSV::on_parambtn_2_clicked()
{
....
if (myData7=="Core_meas"){
            cell0  = ui->tablewidget->item(i,0)->text();
            cell3 = ui->tablewidget->item(i,3)->text();
            Inputs[compteur]=cell3;  //  <---- HERE
            qDebug() << "Inputs baby"<<Inputs[compteur] ;
            compteur++;
        }
....

}

That means the array is still empty right after creating the class instance.

up=new UploadCSV(); // <--- New, empty public array
for(size_t i=0;i<up.Inputs->size();i++){
qDebug() << "this is data",up.Inputs[i] // data access, but not clicked that button before

Also, you need to have access to the "same" instance where your array is filled with data. (See @CP71 and @jsulm answers). This could be done by passing a pointer to that object with contains your data.

[jsulm]

@dziko147 said in How Can i get array in another class:

currently I pass a pointer like this

No, you do not pass any pointers here.
What I mean is:

up = new UploadCSV();
Backend backend(up); // Here you pass pointer to up to Backend instance

Of course you need to change the Backend constructor and store the pointer in Backend as member variable to be able to use it later.

[dziko147]

thank you all for your help :) .

[CP71]

@dziko147
You are welcome! :)