CODEWITHSUNDEEP
c++qtsettings
user63898
user63898

Reputation: 30895

Does Qt QSettings keeps the key/value in memory once loaded?

im using QSettings to write to ini file and loading the configuration in application start my question is once i load value by key does QSettings object keeps the key value in memory or its reads the value from the ini file ?

Upvotes: 2

Views: 2684

Answers (1)

0xbaadf00d
0xbaadf00d

Reputation: 2643

The values are handled in memory, so changing the file doesn't change the QSettings object you have in memory and vice versa.

edit:

Call sync to update to/from file.

It saves values you have modified and reads any values you didn't modify but were modified in the file.

example

// settings.ini contains keys Hello and Hi, which contain both "-"

QSettings settings("settings.ini", QSettings::IniFormat),

// in settings object: *Hello* contains *-* and *Hi* contains *-*   
// in settings.ini: *Hello* contains *-* and *Hi* contains *-*

settings.setValue("Hello", "World");
// settings.ini is modified, Hi now contains World

// in settings object: *Hello* contains *World* and *Hi* contains *-*   
// in settings.ini: *Hello* contains *-* and *Hi* contains *World*

settings.sync();

// in settings object: *Hello* contains *World* and *Hi* contains *World*   
// in settings.ini: *Hello* contains *World* and *Hi* contains *World*

Or that's how it should work if I remember correctly

out of the qt (5.10) docs to QSettings::sync() - This function is called automatically from QSettings's destructor and by the event loop at regular intervals, so you normally don't need to call it yourself.

– lumos0815

Upvotes: 4

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