[solved] connect is not working

matobodo

i am trying to connect pushbutton with slot loginTry() in file login.cpp line 37
connect return true but when i push the button nothing happen

Headers

hlokno.h
@#ifndef HLOKNO_H
#define HLOKNO_H

#include <QMainWindow>
#include <QMdiArea>
#include <QMenuBar>

class hlOkno : public QMainWindow
{
Q_OBJECT

public:
hlOkno(QWidget *parent = 0);
~hlOkno();

protected:
QMenuBar *menu;
QMdiArea *area;

void createMenu();

};

#endif // HLOKNO_H
@

login.h
@#ifndef LOGIN_H
#define LOGIN_H

#include <QObject>
#include <QLabel>
#include <QComboBox>
#include <QLineEdit>
#include <QPushButton>
#include <QMdiSubWindow>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGridLayout>
#include <QCryptographicHash>

class Login : public QObject
{
Q_OBJECT
public:
explicit Login(QObject *parent = 0);

void nastavPrihlasovanie();

QMdiSubWindow *loginOkno;

protected:
QLabel *menoLbl, *hesloLbl;
QComboBox *meno;
QLineEdit *heslo;
QPushButton *login, *koniec;
QHBoxLayout *layoutBtn;
QGridLayout *layoutLblInput;
QVBoxLayout *layoutCentral;

QStringList uzivatelia, hesla;

signals:

private slots:
void loginTry();

};

#endif // LOGIN_H
@

Sources

hlokno.cpp
@#include "hlokno.h"

#include "login.h"

hlOkno::hlOkno(QWidget *parent)
: QMainWindow(parent)
{
menu = new QMenuBar(this);
area = new QMdiArea(this);

setCentralWidget(area);
setMenuBar(menu);

createMenu();

Login loginOkno;

area->addSubWindow(loginOkno.loginOkno);

}

hlOkno::~hlOkno()
{

}

void hlOkno::createMenu()
{
//set menu buttons here
}
@

login.cpp
@#include "login.h"

#include <QDebug>

Login::Login(QObject *parent) :
QObject(parent)
{
loginOkno = new QMdiSubWindow;

menoLbl = new QLabel("Jméno:",loginOkno);
hesloLbl = new QLabel("Heslo:",loginOkno);
meno = new QComboBox;
heslo = new QLineEdit;
login = new QPushButton("Prihlásit",loginOkno);
koniec = new QPushButton("Konec",loginOkno);
layoutLblInput = new QGridLayout;
layoutBtn = new QHBoxLayout;
layoutCentral = new QVBoxLayout;

layoutLblInput->addWidget(menoLbl,0,0);
layoutLblInput->addWidget(hesloLbl,0,1);
layoutLblInput->addWidget(meno,1,0);
layoutLblInput->addWidget(heslo,1,1);

layoutBtn->addWidget(login);
layoutBtn->addWidget(koniec);

layoutCentral->addItem(layoutLblInput);
layoutCentral->addItem(layoutBtn);

delete loginOkno->layout();
loginOkno->setLayout(layoutCentral);

nastavPrihlasovanie();
bool r = connect(login,SIGNAL(clicked()),this,SLOT(loginTry())); //******************* here the slot not work
qDebug() << r;

}

void Login::nastavPrihlasovanie()
{
uzivatelia << "admin" << "user1" << "user2";
hesla << QString(QCryptographicHash::hash("admin",QCryptographicHash::Md5).toHex());
hesla << QString(QCryptographicHash::hash("user1",QCryptographicHash::Md5).toHex());
hesla << QString(QCryptographicHash::hash("user2",QCryptographicHash::Md5).toHex());

meno->addItems(uzivatelia);

}

void Login::loginTry()
{
qDebug() << "Button clicked! :)";
}
@

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

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

return a.exec(&#41;;

}
@

sierdzio

@
Login loginOkno;

area->addSubWindow(loginOkno.loginOkno);
@

You are creating a local variable, on the stack, in the constructor of hlOkno. That variable is destroyed when the constructor finishes. You should create it on heap instead (with "new"). I am surprised you see the interface at all.

matobodo

i am just learning c++ and Qt and i don't understand from your reply how to solve it

sierdzio

@
Login *loginOkno = new Login(this);

area->addSubWindow(loginOkno);
@

Or something similar.

matobodo

@Login *loginOkno = new Login(this);

area->addSubWindow(loginOkno);
@

line 3 error: no matching function for call to 'QMdiArea::addSubWindow(Login*&)'
area->addSubWindow(loginOkno);
^

sierdzio

Well, I don't remember the API right away. Try this:
@
area->addSubWindow(loginOkno->loginOkno);
@

matobodo

yes it works

thank you