Introduction to QT (2.1 the first procedure for the beginning of QT)

One . Project creation steps

1. Click on QT In the software New Project( New projects )
2. Click on Application( application )->Qt Widgets Application(Qt Widget application )->choos( choice )
3. Create a name and path -> next step . Name cannot be Chinese
4. next step
5. next step
6. complete

Two . The function of each file generates

mainwindows.h The header file
main.cpp The main function
mainwindows.cpp The function corresponding to the header file
mainwindows.ui Interface file

3、 ... and . Code

mainwindows.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H


#include <QMainWindow>


namespace Ui {
    
class MainWindow;
}


class MainWindow : public QMainWindow
{
    
    Q_OBJECT


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


private:
    Ui::MainWindow *ui;
};


#endif // MAINWINDOW_H

mainwindows.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    
    ui->setupUi(this);
}


MainWindow::~MainWindow()
{
    
    delete ui;
}

main.cpp

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


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


    return a.exec();
}

Running results

Finally, you get a dialog box