How to pass an attribut to an another class.

yoyo

Hello,
I 'am trying to pass an attribut to another class but it doesn't working.
Anybody's knows the good method ?
In my mainwindow.cpp i catch a QString path (filepath_var) and i whant to pass it in window dialog in order to make a traitement on QFiles and display a chart.
please help me.

Mainwondows*********************************************************************

void MainWindow::on_pushButton_Load_File_clicked()
{
QString Filter = "All files (.) ;; Text Files (*.txt)";
QString filename = QFileDialog::getOpenFileName(this, "Ouvrir un fichier",QDir::homePath(), Filter);

QFile File_R(filename);
if (!File_R.open(QIODevice::ReadOnly | QIODevice::Text))

{QMessageBox::information(this, "Pas de fichier selectionner", "Pas de fichier chargée !");}

//else
//{QMessageBox::information(this,tr("ouvert"),filename);}


QFileInfo fi(filename);
QString filename_aff = fi.fileName();

QString filepath_var =(fi.filePath());

ui->lineEdit_2->setText(filename_aff);

}

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

QString filename = ("C:/Users/Documents/outil/reg.txt");
QFile File_R(filename);
if (!File_R(QIODevice::ReadOnly | QIODevice::Text))

{QMessageBox::information(this, "Pas de fichier selectionner", "Pas de fichier chargée !");}

QTextStream flux(&File_R);
while(!flux.atEnd())

                {

        QString line = flux.readLine();

jsulm

@yoyo There are many ways. If you want to pass it to a dialog then simply add it to dialogs constructor:

Graph_az_cons::Graph_az_cons(QString fileName, QWidget *parent) :
QDialog(parent),
ui(new Ui::Graph_az_cons)
{

yoyo

Sorry but i tried, it is not working :

I put

Graph_az_cons(QString fileName, QWidget *parent) :

in my graph_az_cons.cpp and my graph_az_cons.h

but Qt return to me a error's message : no matching function for call to Graph_az_cons(MainWindow*)'

Code in my main window to call my Qdialog is

if (ui->checkBox_az_cons->isChecked())

    {

    graph_az_cons = new Graph_az_cons(this);
    graph_az_cons->show();


    }

I don't known ??

JonB

@yoyo
You took @jsulm 's suggestion of changing the dialog's constructor to:

Graph_az_cons(QString fileName, QWidget *parent) :

So it now accepts a file name string as its first parameter, right?

So do you not think you need to change your call

graph_az_cons = new Graph_az_cons(this);

to actually pass whatever the file name is to the constructor from this line? That is the point of the change you are making.

yoyo

Yess ! it's working

I put in my Mainwindow

if (ui->checkBox_az_cons->isChecked())

    {

    graph_az_cons = new Graph_az_cons(filepath_var,this);
    graph_az_cons->show();

    }

in my graph_az_cons.h

public:
explicit Graph_az_cons( QString filename, QWidget *parent = nullptr);
~Graph_az_cons();

and in my my graph_az_cons.cpp

Graph_az_cons::Graph_az_cons(QString filename,QWidget *parent) :
QDialog(parent),
ui(new Ui::Graph_az_cons)
{
ui->setupUi(this);

Pablo J. Rogina

@yoyo please don't forget to mark your post as solved!