Creating a q widget

Project try

Hey guys , why every time I try to create a mainwindow in q widget I get a class with these stuff:

ui->setupUi(this);

namespace Ui {
class MainWindow;
}

also why inherit from qmainwindow instead of qwidget ? in here

class MainWindow : public QMainWindow

,

what's the difference between doing this and creating a class that inherit from qwidget ?

for example this class that I used to create a calculator:

@
#ifndef CHECKCLASS_H
#define CHECKCLASS_H
#include<QLabel>
#include<QHBoxLayout>
#include<QLineEdit>
#include<QIntValidator>
#include<QWidget>
#include<QPushButton>
#include<QVBoxLayout>
#include<Qvector>
#include<QMessageBox>
#include<QMenu>
class checkclass : public QWidget
{
Q_OBJECT
public:
checkclass(QWidget *parent=0);

private slots:

void convert();
    void convert1();
    void get_sum();
    void get_mult();
    void convertM();
    void convertM1();
    void get_div();
    void convertD();
    void convertD1();
    void convertS();
    void convertS1();
    void get_sub();

private:

    QLabel *Sum_1;
    QLabel *Mult_1;
    QLabel *Div_1;
    QLabel *Sub_1;
    QMessageBox *Error;
    QVector<double>Cal;

    QPushButton *ReturnV;
    QPushButton *ReturnD;
    QPushButton *ReturnS;
    QLineEdit *Sub;
     QLineEdit *Sub1;
      QLineEdit *SubE;
    QLineEdit *edit;
    QLineEdit *edit1;
    QLineEdit *mult;
    QLineEdit *mult1;
    QLineEdit *multE;
    QLineEdit *Div;
     QLineEdit *Div1;
      QLineEdit *DivE;
    QLineEdit *E;
QIntValidator *Valid;
    QHBoxLayout *left;
    QHBoxLayout *second;
    QHBoxLayout *third;
    QHBoxLayout *four;
        QVBoxLayout *LAY;
        QPushButton *ReturnV1;

    QHBoxLayout *Main;
    double z;

};

#endif // CHECKCLASS_H
@

Eddy

Hi Project try ,

I'm not sure if I understand you well.

As you can see in the docs QMainWindow inherits from QWidget. So it is a QWidget. A lot of things have been implemented in there to help develop desktop applications with menubars, statusbars ...

It is possible to use QWidget or Qdialog as a base class
In step 3 of the wizard you can choose for a QWidget / QDialog / QMainWindow.
Did you use the wizard?

Project try

Sorry man I'm new to i'm not sure what is wizard , I searched and found that it's a class so no I didn't use it , I just finished my first project and wanted to start on another but I was just wondering what is the difference between the two.

Eddy

bq. I was just wondering what is the difference between the two.

As I said QMainWindow is a QWindow and has extra members compared to QWidget.

For your use case : a calculator QWidget will do.

Have a look at this "Getting started Guide":http://qt-project.org/doc/qt-5/gettingstartedqt.html
This explains the wizard and is a very usefull tool to start with.

Happy coding

Project try

Thanks buddy.

Eddy

My pleasure.

If you consider your question answered, could you please edit your first post's title and add [Solved]
thanks