Can no longer build due to no matching function.

[SGaist]

You can copy it, just check that all names are correct

[A Former User]

@SGaist So, I just copied over all the code to a completely new project in a new folder and Qt is still throwing me the same error as in the original post.

[SGaist]

Don't overwrite the new files with the content of the old one, just cherry-pick the modifications you made e.g. slot added etc.

[A Former User]

@SGaist Right, I only copied the code from the old slots directly into the ones in the new project made by Qt, still getting the same error.

[SGaist]

So, recreating your widget from scratch in a new project and just copying the slot code gives you the same error ?

[A Former User]

@SGaist Yup, new folder, new project I created all new files in Qt added all my GUI back, followed to slot, then copied the code in and still get the same error

[SGaist]

Did you check that all names were matching ? Ui widget name vs C++ widget name ?

[A Former User]

@SGaist Right, sorry to be causing so many problems, but thank you for the help! Everything is working now, I missed some of the includes, however I can't use .setModal(true); on a new window opening because it's saying the class has no member called setModal

            behindlogin behindlogin;
            behindlogin.setModal(true);
            behindlogin.exec();
            connClose();

[SGaist]

You're welcome !

setModal and exec are methods from QDialog. From what I understood you have a QMainWindow, no ?

[A Former User]

@SGaist Ahh yes, I've changed from a Dialog to a MainWindow as I wanted the menu bar at the top.

[SGaist]

So problem solved ? :)

[A Former User]

@SGaist The code actually compiles now! Thank you, the only issue left is I've replaced the code with

            behindlogin behindlogin;
            behindlogin.show();
            connClose();


Which causes the window to open and them immediately close after

[SGaist]

If you have something like:

{
    behindlogin behindlogin;
    behindlogin.show();
    connClose();
} <- behindlogin is destroyed here

[A Former User]

@SGaist Right, so I've replaced it with

                behindlogin *behindLogin;

in the header file and then

            behindLogin =new behindlogin(this);
            behindLogin->show();

in the main cpp file but it's saying that behindlogin does not name a type?

[SGaist]

Is behindlogin a member variable of a class ?

[A Former User]

@SGaist Uh, honestly I'm not sure.. I'm very new to Qt and I've been following tutorials. Everything I've looked at makes it look like this should work but I can't figure out what I'm doing incorrectly.

[JKSH]

Hi,

@dejarked said:

in the main cpp file but it's saying that behindlogin does not name a type?

That means you forgot to #include the header that defines the behindlogin.

@dejarked said:

@SGaist Uh, honestly I'm not sure.. I'm very new to Qt and I've been following tutorials. Everything I've looked at makes it look like this should work but I can't figure out what I'm doing incorrectly.

Is your code exactly the same as what's in the tutorial?

[A Former User]

@JKSH Hey, it is exactly the same as it is in the tutorial and the header file was the first thing I checked, behindlogin.h is included in my mainwindow.h which is where I'm trying to declare it.

[JKSH]

@dejarked said:

@JKSH Hey, it is exactly the same as it is in the tutorial and the header file was the first thing I checked, behindlogin.h is included in my mainwindow.h which is where I'm trying to declare it.

Can you post:

1. The contents of your .pro file
2. The contents of behindlogin.h
3. The contents of mainwindow.h ?

[A Former User]

Pro:

#
# Project created by QtCreator 2015-03-25T23:10:30
#
#-------------------------------------------------

QT       += core gui sql

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = project
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp \
    behindlogin.cpp \
    offlinebehind.cpp \
    savingwindow.cpp

HEADERS  += mainwindow.h \
    behindlogin.h \
    offlinebehind.h \
    savingwindow.h

FORMS    += mainwindow.ui \
    behindlogin.ui \
    offlinebehind.ui \
    savingwindow.ui

behindlogin.h

#ifndef BEHINDLOGIN_H
#define BEHINDLOGIN_H

#include <QMainWindow>
#include "mainwindow.h"

namespace Ui {
class behindlogin;
}

class behindlogin : public QMainWindow
{
    Q_OBJECT

public:
    explicit behindlogin(QWidget *parent = 0);
    ~behindlogin();

private slots:
    void on_actionExit_triggered();

    void on_actionNew_Data_triggered();

private:
    Ui::behindlogin *ui;
};

#endif // BEHINDLOGIN_H

mainwindow.h:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include "behindlogin.h"
#include <QMainWindow>
#include <QtSql>
#include <QtDebug>
#include <QFileInfo>


namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    QSqlDatabase mydb;
    void  connClose(){
        mydb.close();
        mydb.removeDatabase(QSqlDatabase::defaultConnection);
    }

    bool connOpen()
    {

        mydb=QSqlDatabase::addDatabase("QSQLITE");
        mydb.setDatabaseName("C:/Users/Jack/Desktop/ProjNEW/SQlite/dataset.db.sqlite");

        if(!mydb.open()){
           qDebug()<<("Disconnected..");
           return false;
        }
        else{
            qDebug()<<("Connected..");
            return true;
           }

    }

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:

    void on_LoginButton_clicked();

    void on_actionOpen_triggered();

    void on_actionExit_triggered();

private:
    Ui::MainWindow *ui;
    behindlogin *behindLogin;
};

#endif // MAINWINDOW_H