communicate data between two windows

[mrjj]

Hi
Should work as you put value in the vector, in the constructor.

what does test->get_vector();
do ?

maybe you return empty list there ?

[Albator]

@Albator said in communicate data between two windows:

QVector<double> get_vector() const{return fer;}

and fer is not empty, it works for c ...

[A Former User]

Is it wrong to use global window pointers and access setters getters via pointer instead of signals&slots?

[Albator]

i want use getter in first but if i have not the choice maybe i will change my solution, it works for c so it should work for the qvector

[mrjj]

@Albator
yes must also work for Qvector same way as int.

[Albator]

@mrjj
that's what I think, but who knows where the pangolin is that's standing in the way of my code?

[mrjj]

@Albator
so while it returns empty list and the same time in same code and
in same run, it can return 3 for c ?
it seems impossible :)

[Albator]

@mrjj
in first i put my value :

seconde_p2::seconde_p2(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::seconde_p2)
{
    ui->setupUi(this);

    c=3;
    fer={ 1, 2, 3, 4, 5, 6, 7 };
    qDebug() << fer;


}

and in second i have a button who call the other windows :

void seconde_p2::on_page3_clicked()
{
    p3 = new seconde_p3(this);
    p3->show();
}

and for the final in the second_p3.cpp (my other window), i use my getter and display :

seconde_p3::seconde_p3(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::seconde_p3)
{
    ui->setupUi(this);

seconde_p2* test = new seconde_p2();
seconde_p2* test1 = new seconde_p2();

test->get_data1();
qDebug()<<"qvector<double> display"<< test->get_data1();

test1->get_c();
qDebug()<<"int display"<< test1->get_c();


}

and tadaaaa : c is displayed correctly and fer is empty
my conclusion ? it's a sad day :(

[Christian Ehrlicher]

@Albator said in communicate data between two windows:

seconde_p2* test = new seconde_p2();
seconde_p2* test1 = new seconde_p2();

C++ basics - this are new local instances - it won't help at all. You have to pass the pointer from the other object to this class. This is basic c++ stuff - programming with Qt without this basic knowledge will not work.

[Albator]

@Christian-Ehrlicher
excuse me I try and thanks to your advices I advance and yes sometimes I miss my bases :)