Basic configuration guide for developing graphical interface applications using Qt under Linux

Basic configuration guide for using Qt to develop graphical interface applications under Linux

1. Introduction
Qt is a cross-platform C library that provides a rich set of graphical interface development components, as well as many other Function module, suitable for developing cross-platform graphical interface applications. This article will introduce how to develop Qt under Linux system, and give some basic configuration guidelines and code examples.

2. Install the Qt development environment

1. Download Qt
   Download the appropriate Qt developer version on the Qt official website (http://www.qt.io/) . Select the appropriate version and installation package, and install according to the guidelines of the official documentation. During the installation process you can choose to install the required components and sample code.

2. Install compiler and build tools
   Qt officially recommends using GCC as the C compiler. Make sure you have the appropriate version of GCC installed, run the following command to check:

   $ gcc --version

In addition, in order to compile and build Qt applications, you also need to install the CMake and Make tools. Run the following command to install:

$ sudo apt-get install cmake make

3. Configure Qt Creator
   The integrated development environment commonly used for Qt development is Qt Creator. After installing Qt, you can find Qt Creator directly in the application menu and start it.

In Qt Creator, click "Tools" -> "Options" -> "Build and Run" -> "Toolchain" and make sure the appropriate compiler is selected. In the "Build Kit" tab, select the appropriate Qt version.

3. Create a simple Qt application

1. New Qt project
   In Qt Creator, click "File" -> "New file or project" -> "Application", select "Qt Widgets Application". Fill in the project name and path and click "Next".

2. Writing code
   In the newly created project, open the "mainwindow.h" file and write the following code:

   #ifndef MAINWINDOW_H
   #define MAINWINDOW_H
   
   #include <QMainWindow>
   
   class MainWindow : public QMainWindow
   {
    Q_OBJECT
   
   public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
   };
   
   #endif // MAINWINDOW_H

Then, open "mainwindow .cpp" file, write the following code:

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
}

MainWindow::~MainWindow()
{
}

3. Compile and run the application
   Click "Build" -> "Build Project" and wait for the compilation to complete. Then click "Run" -> "Run" to start the application.

4. Add interface components
In Qt applications, you can add various components through the interface designer. Click "Project" -> "Add New" -> "Qt" and select the component to be added.

For example, to add a button, select "Qt Widgets" -> "PushButton" and drag it into the window.

5. Add event processing

1. In the mainwindow.h file, add a slot function:

   private slots:
    void onButtonClicked();

2. In mainwindow In the .cpp file, implement the slot function:

   void MainWindow::onButtonClicked()
   {
    // 处理按钮点击事件
   }

3. In the constructor of mainwindow.cpp, connect the button’s click signal and the slot function:

   MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
   {
    QPushButton *button = new QPushButton("Click Me", this);
    connect(button, SIGNAL(clicked()), this, SLOT(onButtonClicked()));
   }

6. Summary
This article introduces the basic steps to configure the Qt development environment under Linux, and gives an example of creating a simple Qt application. Through learning and practice, you can further master Qt development skills and applications.

Appendix:
For complete sample code, please refer to the following link: [GitHub repository](https://github.com/example/qt-basic-configuration)

(Note: The The article is automatically generated by the virtual assistant and is for reference only.)

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