[Solved]Empty QWidget

[yhu420]

Hi everyone,
Today I just tried a new way to organize my code, just putting away the pointers for a moment, but as I see, this doesn't work at all --'. I'm trying to create a basic C++ class from QWidget and with layouts, but unfortunatly nothings shows up in my window :(.

Here's the code: (da header)
@#ifndef MAINWIN_H
#define MAINWIN_H

#include <QWidget>
#include <QLabel>
#include <QLineEdit>
#include <QSpinBox>
#include <QPushButton>
#include <QTextEdit>
#include <QVBoxLayout>
#include <QHBoxLayout>

class Mainwin : public QWidget
{
Q_OBJECT
public:
explicit Mainwin(QWidget *parent = 0);

signals:

public slots:

private:

};

#endif // MAINWIN_H
@

And here's the .cpp:
@#include "Mainwin.h"

Mainwin::Mainwin(QWidget *parent) : QWidget(parent)
{
QLabel ip; ip.setText(tr("IP du serveur"));
QLabel servport; servport.setText(tr("Port du serveur"));
QLabel pseudo; pseudo.setText(tr("Pseudo: "));
QLabel message; message.setText(tr("Message: "));

QLineEdit servedit;     servedit.setText("127.0.0.1");

QSpinBox serportspin;   serportspin.setValue(50885);

QPushButton connectbut; connectbut.setText(tr("Connexion"));
QPushButton sendbut;    sendbut.setText(tr("Envoyer"));

QTextEdit mainte;       mainte.setReadOnly(true);
QTextEdit pseudoedit;   //settings.value("lastpseudo") TODO
QTextEdit messageedit;

QVBoxLayout *mainlayout = new QVBoxLayout;

QHBoxLayout *top = new QHBoxLayout;
QHBoxLayout *bottom = new QHBoxLayout;

top->addWidget(&ip); top->addWidget(&servedit); top->addWidget(&servport); top->addWidget(&serportspin); top->addWidget(&connectbut);
//mainte
bottom->addWidget(&pseudo); bottom->addWidget(&pseudoedit); bottom->addWidget(&message); bottom->addWidget(&messageedit); bottom->addWidget(&sendbut);

mainlayout->addLayout(top);
mainlayout->addWidget(&mainte);
mainlayout->addLayout(bottom);
setLayout(mainlayout);

}
@

I'm pretty sure I made a stupid mistake somewhere..
Thank you for every answer you can bring

[SGaist]

Hi,

All your widgets go out of scope at the end of the constructor so they are destroyed

[yhu420]

Ok so I HAVE TO use pointers in my constructor right?
Thanks for your reply

[SGaist]

Yes, you have to allocate the widgets on the heap.

Have a look at the examples from the doc, it's all explained

[yhu420]

Yes, that's not my first use of Qt so I know (more or less) how it works. I just replaced the widgets by pointers and it works, thanks to you ;) .

[SGaist]

You're welcome !

I'll encourage you to also get a good book on C++ and Qt to get a better understanding of how it works. It will save you a lot of trouble later