[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