QSettings Class Reference

Detailed Description

The QSettings class provides persistent platform-independent application settings.

Users normally expect an application to remember its settings (window sizes and positions, options, etc.) across sessions. This information is often stored in the system registry on Windows, and in XML preferences files on Mac OS X. On Unix systems, in the absence of a standard, many applications (including the KDE applications) use INI text files.

QSettings is an abstraction around these technologies, enabling you to save and restore application settings in a portable manner. It also supports custom storage formats.

QSettings's API is based on QVariant, allowing you to save most value-based types, such as QString, QRect, and QImage, with the minimum of effort.

If all you need is a non-persistent memory-based structure, consider using QMap<QString, QVariant> instead.

Basic Usage

When creating a QSettings object, you must pass the name of your company or organization as well as the name of your application. For example, if your product is called Star Runner and your company is called MySoft, you would construct the QSettings object as follows:

     QSettings settings("MySoft", "Star Runner");

QSettings objects can be created either on the stack or on the heap (i.e. using new). Constructing and destroying a QSettings object is very fast.

If you use QSettings from many places in your application, you might want to specify the organization name and the application name using QCoreApplication::setOrganizationName() and QCoreApplication::setApplicationName(), and then use the default QSettings constructor:

     QCoreApplication::setOrganizationName("MySoft");
     QCoreApplication::setOrganizationDomain("mysoft.com");
     QCoreApplication::setApplicationName("Star Runner");
     ...
     QSettings settings;

(Here, we also specify the organization's Internet domain. When the Internet domain is set, it is used on Mac OS X instead of the organization name, since Mac OS X applications conventionally use Internet domains to identify themselves. If no domain is set, a fake domain is derived from the organization name. See the Platform-Specific Notes below for details.)

QSettings stores settings. Each setting consists of a QString that specifies the setting's name (the key) and a QVariant that stores the data associated with the key. To write a setting, use setValue(). For example:

     settings.setValue("editor/wrapMargin", 68);

If there already exists a setting with the same key, the existing value is overwritten by the new value. For efficiency, the changes may not be saved to permanent storage immediately. (You can always call sync() to commit your changes.)

You can get a setting's value back using value():

     int margin = settings.value("editor/wrapMargin").toInt();

If there is no setting with the specified name, QSettings returns a null QVariant (which can be converted to the integer 0). You can specify another default value by passing a second argument to value():

     int margin = settings.value("editor/wrapMargin", 80).toInt();

To test whether a given key exists, call contains(). To remove the setting associated with a key, call remove(). To obtain the list of all keys, call allKeys(). To remove all keys, call clear().

QVariant and GUI Types

Because QVariant is part of the QtCore library, it cannot provide conversion functions to data types such as QColor, QImage, and QPixmap, which are part of QtGui. In other words, there is no toColor(), toImage(), or toPixmap() functions in QVariant.

Instead, you can use the QVariant::value() or the qVariantValue() template function. For example:

 QSettings settings("MySoft", "Star Runner");
 QColor color = settings.value("DataPump/bgcolor").value<QColor>();

The inverse conversion (e.g., from QColor to QVariant) is automatic for all data types supported by QVariant, including GUI-related types:

 QSettings settings("MySoft", "Star Runner");
 QColor color = palette().background().color();
 settings.setValue("DataPump/bgcolor", color);

Custom types registered using qRegisterMetaType() and qRegisterMetaTypeStreamOperators() can be stored using QSettings.

Section and Key Syntax

Setting keys can contain any Unicode characters. The Windows registry and INI files use case-insensitive keys, whereas the Carbon Preferences API on Mac OS X uses case-sensitive keys. To avoid portability problems, follow these simple rules:

1. Always refer to the same key using the same case. For example, if you refer to a key as "text fonts" in one place in your code, don't refer to it as "Text Fonts" somewhere else.
2. Avoid key names that are identical except for the case. For example, if you have a key called "MainWindow", don't try to save another key as "mainwindow".
3. Do not use slashes ('/' and '\') in section or key names; the backslash character is used to separate sub keys (see below). On windows '\' are converted by QSettings to '/', which makes them identical.

You can form hierarchical keys using the '/' character as a separator, similar to Unix file paths. For example:

     settings.setValue("mainwindow/size", win->size());
     settings.setValue("mainwindow/fullScreen", win->isFullScreen());
     settings.setValue("outputpanel/visible", panel->isVisible());

If you want to save or restore many settings with the same prefix, you can specify the prefix using beginGroup() and call endGroup() at the end. Here's the same example again, but this time using the group mechanism:

     settings.beginGroup("mainwindow");
     settings.setValue("size", win->size());
     settings.setValue("fullScreen", win->isFullScreen());
     settings.endGroup();

     settings.beginGroup("outputpanel");
     settings.setValue("visible", panel->isVisible());
     settings.endGroup();

If a group is set using beginGroup(), the behavior of most functions changes consequently. Groups can be set recursively.

In addition to groups, QSettings also supports an "array" concept. See beginReadArray() and beginWriteArray() for details.

Fallback Mechanism

Let's assume that you have created a QSettings object with the organization name MySoft and the application name Star Runner. When you look up a value, up to four locations are searched in that order:

1. a user-specific location for the Star Runner application
2. a user-specific location for all applications by MySoft
3. a system-wide location for the Star Runner application
4. a system-wide location for all applications by MySoft

(See Platform-Specific Notes below for information on what these locations are on the different platforms supported by Qt.)

If a key cannot be found in the first location, the search goes on in the second location, and so on. This enables you to store system-wide or organization-wide settings and to override them on a per-user or per-application basis. To turn off this mechanism, call setFallbacksEnabled(false).

Although keys from all four locations are available for reading, only the first file (the user-specific location for the application at hand) is accessible for writing. To write to any of the other files, omit the application name and/or specify QSettings::SystemScope (as opposed to QSettings::UserScope, the default).

Let's see with an example:

     QSettings obj1("MySoft", "Star Runner");
     QSettings obj2("MySoft");
     QSettings obj3(QSettings::SystemScope, "MySoft", "Star Runner");
     QSettings obj4(QSettings::SystemScope, "MySoft");

The table below summarizes which QSettings objects access which location. "X" means that the location is the main location associated to the QSettings object and is used both for reading and for writing; "o" means that the location is used as a fallback when reading.

The beauty of this mechanism is that it works on all platforms supported by Qt and that it still gives you a lot of flexibility, without requiring you to specify any file names or registry paths.

If you want to use INI files on all platforms instead of the native API, you can pass QSettings::IniFormat as the first argument to the QSettings constructor, followed by the scope, the organization name, and the application name:

     QSettings settings(QSettings::IniFormat, QSettings::UserScope,
                        "MySoft", "Star Runner");

The Settings Editor example lets you experiment with different settings location and with fallbacks turned on or off.

Restoring the State of a GUI Application

QSettings is often used to store the state of a GUI application. The following example illustrates how to use QSettings to save and restore the geometry of an application's main window.

 void MainWindow::writeSettings()
 {
     QSettings settings("Moose Soft", "Clipper");

     settings.beginGroup("MainWindow");
     settings.setValue("size", size());
     settings.setValue("pos", pos());
     settings.endGroup();
 }

 void MainWindow::readSettings()
 {
     QSettings settings("Moose Soft", "Clipper");

     settings.beginGroup("MainWindow");
     resize(settings.value("size", QSize(400, 400)).toSize());
     move(settings.value("pos", QPoint(200, 200)).toPoint());
     settings.endGroup();
 }

See Window Geometry for a discussion on why it is better to call QWidget::resize() and QWidget::move() rather than QWidget::setGeometry() to restore a window's geometry.

The readSettings() and writeSettings() functions must be called from the main window's constructor and close event handler as follows:

 MainWindow::MainWindow()
 {
     ...
     readSettings();
 }

 void MainWindow::closeEvent(QCloseEvent *event)
 {
     if (userReallyWantsToQuit()) {
         writeSettings();
         event->accept();
     } else {
         event->ignore();
     }
 }

See the Application example for a self-contained example that uses QSettings.

Accessing Settings from Multiple Threads or Processes Simultaneously

QSettings is reentrant. This means that you can use distinct QSettings object in different threads simultaneously. This guarantee stands even when the QSettings objects refer to the same files on disk (or to the same entries in the system registry). If a setting is modified through one QSettings object, the change will immediately be visible in any other QSettings objects that operate on the same location and that live in the same process.

QSettings can safely be used from different processes (which can be different instances of your application running at the same time or different applications altogether) to read and write to the same system locations. It uses advisory file locking and a smart merging algorithm to ensure data integrity. Note that sync() imports changes made by other processes (in addition to writing the changes from this QSettings).

Platform-Specific Notes

Locations Where Application Settings Are Stored

As mentioned in the Fallback Mechanism section, QSettings stores settings for an application in up to four locations, depending on whether the settings are user-specific or system-wide and whether the settings are application-specific or organization-wide. For simplicity, we're assuming the organization is called MySoft and the application is called Star Runner.

On Unix systems, if the file format is NativeFormat, the following files are used by default:

1. $HOME/.config/MySoft/Star Runner.conf (Qt for Embedded Linux: $HOME/Settings/MySoft/Star Runner.conf)
2. $HOME/.config/MySoft.conf (Qt for Embedded Linux: $HOME/Settings/MySoft.conf)
3. /etc/xdg/MySoft/Star Runner.conf
4. /etc/xdg/MySoft.conf

On Mac OS X versions 10.2 and 10.3, these files are used by default:

1. $HOME/Library/Preferences/com.MySoft.Star Runner.plist
2. $HOME/Library/Preferences/com.MySoft.plist
3. /Library/Preferences/com.MySoft.Star Runner.plist
4. /Library/Preferences/com.MySoft.plist

On Windows, NativeFormat settings are stored in the following registry paths:

1. HKEY_CURRENT_USER\Software\MySoft\Star Runner
2. HKEY_CURRENT_USER\Software\MySoft
3. HKEY_LOCAL_MACHINE\Software\MySoft\Star Runner
4. HKEY_LOCAL_MACHINE\Software\MySoft

Note: On Windows, for 32-bit programs running in WOW64 mode, settings are stored in the following registry path: HKEY_LOCAL_MACHINE\Software\WOW6432node.

On BlackBerry only a single file is used (see Platform Limitations). If the file format is NativeFormat, this is "Settings/MySoft/Star Runner.conf" in the application's home directory.

If the file format is IniFormat, the following files are used on Unix and Mac OS X:

1. $HOME/.config/MySoft/Star Runner.ini (Qt for Embedded Linux: $HOME/Settings/MySoft/Star Runner.ini)
2. $HOME/.config/MySoft.ini (Qt for Embedded Linux: $HOME/Settings/MySoft.ini)
3. /etc/xdg/MySoft/Star Runner.ini
4. /etc/xdg/MySoft.ini

On Windows, the following files are used:

1. %APPDATA%\MySoft\Star Runner.ini
2. %APPDATA%\MySoft.ini
3. %COMMON_APPDATA%\MySoft\Star Runner.ini
4. %COMMON_APPDATA%\MySoft.ini

The %APPDATA% path is usually C:\Documents and Settings\User Name\Application Data; the %COMMON_APPDATA% path is usually C:\Documents and Settings\All Users\Application Data.

On BlackBerry only a single file is used (see Platform Limitations). If the file format is IniFormat, this is "Settings/MySoft/Star Runner.ini" in the application's home directory.

On Symbian, the following files are used for both IniFormat and NativeFormat (in this example, we assume that the application is installed on the e-drive and its Secure ID is 0xECB00931):

1. c:\data\.config\MySoft\Star Runner.conf
2. c:\data\.config\MySoft.conf
3. e:\private\ecb00931\MySoft\Star Runner.conf
4. e:\private\ecb00931\MySoft.conf

The SystemScope settings location is determined from the installation drive and Secure ID (UID3) of the application. If the application is built-in on the ROM, the drive used for SystemScope is c:.

Note: Symbian SystemScope settings are by default private to the application and not shared between applications, unlike other environments.

The paths for the .ini and .conf files can be changed using setPath(). On Unix and Mac OS X, the user can override them by setting the XDG_CONFIG_HOME environment variable; see setPath() for details.

Accessing INI and .plist Files Directly

Sometimes you do want to access settings stored in a specific file or registry path. On all platforms, if you want to read an INI file directly, you can use the QSettings constructor that takes a file name as first argument and pass QSettings::IniFormat as second argument. For example:

 QSettings settings("/home/petra/misc/myapp.ini",
                    QSettings::IniFormat);

You can then use the QSettings object to read and write settings in the file.

On Mac OS X, you can access XML-based .plist files by passing QSettings::NativeFormat as second argument. For example:

 QSettings settings("/Users/petra/misc/myapp.plist",
                    QSettings::NativeFormat);

Accessing the Windows Registry Directly

On Windows, QSettings lets you access settings that have been written with QSettings (or settings in a supported format, e.g., string data) in the system registry. This is done by constructing a QSettings object with a path in the registry and QSettings::NativeFormat.

For example:

 QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Office",
                    QSettings::NativeFormat);

All the registry entries that appear under the specified path can be read or written through the QSettings object as usual (using forward slashes instead of backslashes). For example:

 settings.setValue("11.0/Outlook/Security/DontTrustInstalledFiles", 0);

Note that the backslash character is, as mentioned, used by QSettings to separate subkeys. As a result, you cannot read or write windows registry entries that contain slashes or backslashes; you should use a native windows API if you need to do so.

Accessing Common Registry Settings on Windows

On Windows, it is possible for a key to have both a value and subkeys. Its default value is accessed by using "Default" or "." in place of a subkey:

 settings.setValue("HKEY_CURRENT_USER\\MySoft\\Star Runner\\Galaxy", "Milkyway");
 settings.setValue("HKEY_CURRENT_USER\\MySoft\\Star Runner\\Galaxy\\Sun", "OurStar");
 settings.value("HKEY_CURRENT_USER\\MySoft\\Star Runner\\Galaxy\\Default"); // returns "Milkyway"

On other platforms than Windows, "Default" and "." would be treated as regular subkeys.

Securing application settings in Symbian

UserScope settings in Symbian are writable by any application by default. To protect the application settings from access and tampering by other applications, the settings need to be placed in the private secure area of the application. This can be done by specifying the settings storage path directly to the private area. The following snippet changes the UserScope to c:/private/ecb00931/MySoft.conf (provided the application is installed on the c-drive and its Secure ID is 0xECB00931:

 QSettings settings(QApplication::applicationDirPath() + "/MySoft.conf");

Framework libraries (like Qt itself) may store configuration and cache settings using UserScope, which is accessible and writable by other applications. If the application is very security sensitive or uses high platform security capabilities, it may be prudent to also force framework settings to be stored in the private directory of the application. This can be done by changing the default path of UserScope before QApplication is created:

 #include <QSettings>
 #include <QDesktopServices>
 int main(int argc, char *argv[])
 {
 #ifdef Q_OS_SYMBIAN
     // Use QDesktopServices:storageLocation as QApplication is not yet created
     QSettings::setPath(
         QSettings::NativeFormat, QSettings::UserScope,
         QDesktopServices::storageLocation(QDesktopServices::DataLocation) + "/settings");
 #endif
     QApplication app(argc, argv);

     ...
 }

Note that this may affect framework libraries' functionality if they expect the settings to be shared between applications.

Changing the location of global Qt settings on Mac OS X

On Mac OS X, the global Qt settings (stored in com.trolltech.plist) are stored in the application settings file in two situations:

1. If the application runs in a Mac OS X sandbox (on Mac OS X 10.7 or later) or
2. If the Info.plist file of the application contains the key "ForAppStore" with the value "yes"

In these situations, the application settings file is named using the bundle identifier of the application, which must consequently be set in the application's Info.plist file.

This feature is provided to ease the acceptance of Qt applications into the Mac App Store, as the default behaviour of storing global Qt settings in the com.trolltech.plist file does not conform with Mac App Store file system usage requirements. For more information about submitting Qt applications to the Mac App Store, see Preparing a Qt application for Mac App Store submission.

Platform Limitations

While QSettings attempts to smooth over the differences between the different supported platforms, there are still a few differences that you should be aware of when porting your application:

• The Windows system registry has the following limitations: A subkey may not exceed 255 characters, an entry's value may not exceed 16,383 characters, and all the values of a key may not exceed 65,535 characters. One way to work around these limitations is to store the settings using the IniFormat instead of the NativeFormat.
• On Mac OS X, allKeys() will return some extra keys for global settings that apply to all applications. These keys can be read using value() but cannot be changed, only shadowed. Calling setFallbacksEnabled(false) will hide these global settings.
• On Mac OS X, the CFPreferences API used by QSettings expects Internet domain names rather than organization names. To provide a uniform API, QSettings derives a fake domain name from the organization name (unless the organization name already is a domain name, e.g. OpenOffice.org). The algorithm appends ".com" to the company name and replaces spaces and other illegal characters with hyphens. If you want to specify a different domain name, call QCoreApplication::setOrganizationDomain(), QCoreApplication::setOrganizationName(), and QCoreApplication::setApplicationName() in your main() function and then use the default QSettings constructor. Another solution is to use preprocessor directives, for example:

   #ifdef Q_WS_MAC
       QSettings settings("grenoullelogique.fr", "Squash");
   #else
       QSettings settings("Grenoulle Logique", "Squash");
   #endif

• On Unix and Mac OS X systems, the advisory file locking is disabled if NFS (or AutoFS or CacheFS) is detected to work around a bug in the NFS fcntl() implementation, which hangs forever if statd or lockd aren't running. Also, the locking isn't performed when accessing .plist files.
• On the BlackBerry platform, applications run in a sandbox. They are not allowed to read or write outside of this sandbox. This involves the following limitations:
  • As there is only a single scope the scope is simply ignored, i.e. there is no difference between SystemScope and UserScope.
  • The Fallback Mechanism is not applied, i.e. only a single location is considered.
  • It is advised against setting and using custom file paths.