QT 讀寫配置文件（*.INI）

#include <QString>

class MyConfig
{
public:
    MyConfig();

    void LoadFile();  // 從配置文件中讀取
    void SaveFile();  // 向文件中寫入

    double P_double1 = 1.23;
    double P_double2 = 3.1415;
    double P_double3 = 10.0;
    int  P_int1 = 456;
    int  P_int2 = 123;
    QString P_string1 = "abc";
    QString P_string2 = "efg";
};

#include "myconfig.h"
#include <QSettings>

#include <iostream>
#include <fstream>

MyConfig::MyConfig()
{

}

void MyConfig::LoadFile()
{
    std::string filepath = "MyConfig.ini";

    // 先判斷文件是否存在
    std::ifstream file(filepath);
    if(file.good() == false)
    {
        this->SaveFile();
        return;
    }

    // 讀取文件
    QSettings settings(QString::fromStdString(filepath), QSettings::IniFormat);

    settings.beginGroup("GroupName1");
    this->P_double1 = settings.value("P_double1").toDouble();
    this->P_double2 = settings.value("P_double2").toDouble();
    this->P_double3 = settings.value("P_double3").toDouble();
    settings.endGroup();

    settings.beginGroup("GroupName2");
    this->P_int1 = settings.value("P_int1").toInt();
    this->P_int2 = settings.value("P_int2").toInt();
    settings.endGroup();

    settings.beginGroup("GroupName3");
    this->P_string1 = settings.value("P_string1").toString();
    this->P_string2 = settings.value("P_string2").toString();
    settings.endGroup();
}

void MyConfig::SaveFile()
{
    QSettings settings("MyConfig.ini", QSettings::IniFormat);

    settings.beginGroup("GroupName1");
    settings.setValue("P_double1", this->P_double1);
    settings.setValue("P_double2", this->P_double2);
    settings.setValue("P_double3", this->P_double3);
    settings.endGroup();

    settings.beginGroup("GroupName2");
    settings.setValue("P_int1", this->P_int1);
    settings.setValue("P_int2", this->P_int2);
    settings.endGroup();

    settings.beginGroup("GroupName3");
    settings.setValue("P_string1", this->P_string1);
    settings.setValue("P_string2", this->P_string2);
    settings.endGroup();

}