[SOLVED] QLineEdit and connect problem.

pawelm

Hello!
Few days ago I've started learning Qt and found some problems.
I am making small program with QLineEdit and QPushButton. I want to show text of QlineEdit in QMessageBox after clicking a button but the program crashes. What's wrong? Here is code:

dialog.h

@#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QtCore>
#include <QtGui>
#include <QtWidgets>

class Dialog : public QDialog
{
Q_OBJECT

public:
explicit Dialog(QWidget *parent = 0);

private slots:
void on_pushButton_clicked();

private:
QLineEdit *lineEdit;
QPushButton *button;
QVBoxLayout *layout;
};

#endif // DIALOG_H@

dialog.cpp
@#include "dialog.h"

Dialog::Dialog(QWidget *parent) : QDialog(parent)
{
QLineEdit *lineEdit = new QLineEdit;
QPushButton *button = new QPushButton("Click");
QVBoxLayout *layout = new QVBoxLayout;
setLayout(layout);
layout->addWidget(lineEdit);
layout->addWidget(button);
connect(button,SIGNAL(clicked()),this,SLOT(on_pushButton_clicked()));
}

void Dialog::on_pushButton_clicked()
{
QMessageBox::information(this,"Message",lineEdit->text());
}
@

main.cpp
@#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Dialog w;
w.show();

return a.exec(&#41;;

}
@

How should it be correct?

SGaist

Hi and welcome to devnet,

You are shadowing your class member variables in your constructor. Correct that and you'll be good to go

pawelm

Thank you very much! Now I see.

SGaist

You're welcome !

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