zero , Preface

.ini File is the configuration file of the program , It is used to record historical information , Interface information , User operation, etc , Except, of course, ini Files can hold information , Other files can also be saved （json,txt,csv etc. ）, If the data is relatively small and not frequently read and written, you can use the following formats to save .

Use ini file save ： It does not need to open the file to operate .
Save in other ways ： You need to open the file before reading and writing .
So in case of frequent operation ,ini Documents have great advantages .

operation ini Files need to use classes QSettings, The prototype is as follows ：
QSettings setting(const QString &fileName,Format format,QObject* parent = 0);

Parameters 1： Profile name , If the file name does not exist , Automatically create ;

Parameters 2： be equal to QSetting::IniFormat when , Read and write *.ini Format of the configuration file ;

Parameters 3： You can default to ;

First, add a header file in the file header #include ,

One , Write

    // establish QSettings Object and specify ini File path and set the format to ini
    QSettings setting("./iniTest.ini", QSettings::IniFormat);
    // Create the first group ( The first way to create a group )
    setting.beginGroup("group1");
    // Add key value pairs in the first group 
    setting.setValue("key1", "val1");
    setting.setValue("key2", "val2");
    setting.setValue("sameKay", "sameVal");
    // Set the end of the current grouping 
    setting.endGroup();
    // Add the second group and its key value pair （ The second way to create a group ）
    setting.setValue("group2/jian1", "zhi1");
    setting.setValue("group2/jian2", "zhi4");
    setting.setValue("group2/jian3", "zhi2");
    setting.setValue("group2/sameKay", "sameZhi");

Two , read

Read the specified value , There is also a way to read all key values .

    // establish QSettings Object and specify ini File path and set the format to ini
    QSettings setting1("./iniTest.ini", QSettings::IniFormat);
    qDebug() << " The second reading method ";
    // obtain ini All groups in the file 
    QStringList groupList = setting1.childGroups();
    // Specify to read a set of data 
    setting1.beginGroup(groupList[1]);
    // Traverse the keys of the group 
    foreach (QString key, setting1.childKeys())
    {
    
        // Print out the current key value pair 
        qDebug() << key << setting1.value(key).toString();
    }

total

This article is used for personal records