使用QFile和QDataStream（或QTextStream）序列化一个类举例

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1.概要

使用QFile和QDataStream（或QTextStream）序列化一个类举例

2.代码

1.工程结构

2.工程文件

cmake_minimum_required(VERSION 3.14)

project(untitled4 LANGUAGES CXX)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Core)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Core)

add_executable(untitled4
  main.cpp
  mypersistentclass.h mypersistentclass.cpp
)
target_link_libraries(untitled4 Qt${QT_VERSION_MAJOR}::Core)

include(GNUInstallDirs)
install(TARGETS untitled4
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

3.MyPersistentClass头文件

#ifndef MYPERSISTENTCLASS_H
#define MYPERSISTENTCLASS_H

#include <QObject>
#include <QString>

class MyPersistentClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QString name READ name WRITE setName)
    Q_PROPERTY(int age READ age WRITE setAge)

public:
    explicit MyPersistentClass(QObject *parent = nullptr);

    QString name() const;
    void setName(const QString &name);

    int age() const;
    void setAge(int age);

    void saveSettings() const;
    void loadSettings();

private:
    QString m_name;
    int m_age;
};

#endif // MYPERSISTENTCLASS_H

4.MyPersistentClass源文件

#include "MyPersistentClass.h"
#include <QSettings>
#include <QDebug>

MyPersistentClass::MyPersistentClass(QObject *parent)
    : QObject(parent), m_name("DefaultName"), m_age(0) {}

QString MyPersistentClass::name() const
{
    return m_name;
}

void MyPersistentClass::setName(const QString &name)
{
    m_name = name;
}

int MyPersistentClass::age() const
{
    return m_age;
}

void MyPersistentClass::setAge(int age)
{
    m_age = age;
}

void MyPersistentClass::saveSettings() const
{
    QSettings settings("MyCompany", "MyApplication");
    settings.setValue("name", m_name);
    settings.setValue("age", m_age);
}

void MyPersistentClass::loadSettings()
{
    QSettings settings("MyCompany", "MyApplication");
    m_name = settings.value("name", "DefaultName").toString();
    m_age = settings.value("age", 0).toInt();
}

5.主函数

3.运行结果

11:14:01: Debugging D:\projects\qts\untitled4\build\Desktop_Qt_6_7_2_MinGW_64_bit-Debug\untitled4.exe ...
Loaded settings: Name = "NewName" , Age = 30
Saved settings: Name = "NewName" , Age = 50
Reloaded settings: Name = "NewName" , Age = 50