f I have conf file , how to read those settings in QSettings

Qt Enthusiast

I have config file /home/user/conf.conf is there any way I read the settings in QSetting from thos conf.conf file

Stoyan

QSettings settings("/home/user/conf.conf", QSettings::IniFormat);

Then you can get values like this:

QString value1 = settings.value("Key1").toString();

the_

@Qt-Enthusiast
what's the format of the stored settings in the conf file? can you show an example file?

Stoyan

@the_
On Linux in most of the cases conf-file is the same format as ini-file:

key = value

If in this case it is not, then he can't use QSettings at all and have to read and parse the file manually.

Qt Enthusiast

@Stoyan
It is same as where default QSettings are stored in file . By the way what is exact path default QSettings of GUI are save

Stoyan

@Qt-Enthusiast
See this: http://doc.qt.io/qt-5/qsettings.html
I don't think there is default path with "QSettings::IniFormat".

the_

@Stoyan
yes I know that there is a 'default' format but who says that all conf file look like this? seen too many of them in the last 15years on Unix systems ;)

you could still register your own reader and writer functions to use your own format
http://doc.qt.io/qt-5/qsettings.html#registerFormat

Stoyan

@the_
That's right. There are many formats.
I never used this function, but I see this:

The readFunc and writeFunc parameters are pointers to functions that read and write a set of key/value pairs.

I think that this will not work in case of other format without key/value structure like this:

# TYPE  DATABASE        USER            ADDRESS                 METHOD
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5

the_

@Stoyan

yes you will need a key-value pair, but how you get them inside your functions is your part

The functions for reading and writing are defined as following

bool write(QIODevice &dev,const QSettings::SettingsMap &map);
bool read(QIODevice &dev,QSettings::SettingsMap &map);

you can put everything as key value pairs in map as long as you parse the settings->value(yourkey) correctly in the code ;)

--
edit: example added

i for example have done this for encrypted config file

bool read(QIODevice &dev,QSettings::SettingsMap &map) {
    qDebug() << "SETTINGS READER" ;
    SimpleCrypt cryptokey;
    cryptokey.setKey(/*secret ;) */);


    QByteArray s = dev.readAll();


    QString decrypted = cryptokey.decryptToString(s);
   
    QStringList localSplit = decrypted.split(";");
    if(localSplit.length()<2)
        return true;
    foreach(QString k,localSplit) {
        QStringList split = k.split(("=>"));
        map.insert(split.at(0),split.at(1));
    }

    return true;
}

bool write(QIODevice &dev,const QSettings::SettingsMap &map) {
    qDebug() << "SETTINGS WRITER";
    QString s;
    foreach(QString k,map.keys())
        s.append(k+"=>"+map.value(k).toString()+";");

    s = s.remove(s.length()-1,1);
  
    SimpleCrypt cryptokey;
    cryptokey.setKey(/*secret ;) */);

    QByteArray enctxt = cryptokey.encryptToByteArray(s);
   
    dev.write(enctxt,enctxt.length());
    return true;

}

Stoyan

@the_
Well, now I see that QSettings offer much more possibilities than I suspect. :)

Qt Enthusiast

One solution I have thought
Th user in my product will specify the location of my conf and the conf format will be same as that how QSettings saves

iif (userSpecifiedConf)
QSettings settings (userConf, QSettings::IniFormat);
else
QSettings settings;

Please let me know if this solution is OK

jsulm

@Qt-Enthusiast said in f I have conf file , how to read those settings in QSettings:

Th user in my product will specify the location of my conf

This is unusual. Usually the config file is located in the home directory of the user as hidden file, like /home/USER_NAME/.myapp
This is how UNIX works for decades already, no need to ask the user for that.
Global configuration goes to /etc/myapp