Passing variable from one form to another

[Nicklax]

Hello, I am having trouble passing a value from one function in Qt to another in a different form

Beastiary.cpp


void beastiary::on_listWidget_itemClicked(QListWidgetIt em *item)
{
const QString nvalue = ui->listWidget->currentItem()->text(); //Value that needs to passed
read red;
red.setModal(true);
red.exec();
red.ulk();

}


read.cpp


void read::ulk()
{

QFile file (nvalue); //needs nvalue from beastiary so it knows the name of the file to look for
if (!file.open(QFile::ReadOnly | QFile::Text))
{
QMessageBox::warning (this, "Error", "File Could not Be Opened");

}
QString line;
QTextStream in(&file);
while (!in.atEnd())
{
line = in.readLine();
ui->lineEdit_name_r->setText(ui->lineEdit_name_r->text()+line);
qDebug() <<line;
}
}


The variable nvalue must be obtained in beastiary.cpp but is needed in read.cpp and im not sure of how to pass the variable to read from beastiary.

[monillo]

Hi.
In read.cpp or read.h add variable nvalue (if you like the same name), now in beastiary.cpp before red.exe() assign value to "nvalue", for example: red.nvalue = nvalue.

Hope this help.

[Nicklax]

Thanks for the reply, I tried your suggestion but got the following error: passing 'const QString' as 'this' argument discards qualifiers [-fpermissive]

This is the code I wrote for it
read.h


#ifndef READ_H
#define READ_H

#include <QDialog>


namespace Ui {
class read;
}

class read : public QDialog
{
Q_OBJECT

friend class beastiary;

public:
const QString nvalue;
void ulk();
explicit read(QWidget *parent = 0);
~read();

private:
Ui::read *ui;

};


#endif // READ_H


beastiary.cpp


void beastiary::on_listWidget_itemClicked(QListWidgetIt em *item)
{
const QString nvalue = ui->listWidget->currentItem()->text();
read red;
red.nvalue=nvalue;
red.setModal(true);
red.exec();
red.ulk();

}


read.cpp



void read::ulk()
{
QFile file (nvalue);
if (!file.open(QFile::ReadOnly | QFile::Text))
{
QMessageBox::warning (this, "Error", "File Could not Be Opened");
}
QString line;
QTextStream in(&file);
while (!in.atEnd())
{
line = in.readLine();
ui->lineEdit_name_r->setText(ui->lineEdit_name_r->text()+line);
qDebug() <<line;
}
}

[anda_skoa]

You can't assign to a "const" member or variable, it is "constant".

You can keep the const if you pass the value as an argument to read's constructor.

Cheers,
_