Can no longer build due to no matching function.

SGaist

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

dejarked

@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.

dejarked

@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 ?

dejarked

@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 ?

dejarked

@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 ?

dejarked

@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 ? :)

dejarked

@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

dejarked

@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 ?

dejarked

@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?

dejarked

@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:

The contents of your .pro file
The contents of behindlogin.h
The contents of mainwindow.h ?

dejarked

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