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# Qt 3 Support Members for QSettings

The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.

- QSettings class reference

### Public Types

- enum System { Unix, Windows, Mac }

### Public Functions

- QStringList entryList ( const QString & key ) const
- void insertSearchPath ( System system, const QString & path )
- bool readBoolEntry ( const QString & key, bool defaultValue = false, bool * ok = 0 )
- double readDoubleEntry ( const QString & key, double defaultValue = 0, bool * ok = 0 )
- QString readEntry ( const QString & key, const QString & defaultValue = QString(), bool * ok = 0 )
- QStringList readListEntry ( const QString & key, bool * ok = 0 )
- QStringList readListEntry ( const QString & key, QChar separator, bool * ok = 0 )
- int readNumEntry ( const QString & key, int defaultValue = 0, bool * ok = 0 )
- bool removeEntry ( const QString & key )
- void removeSearchPath ( System system, const QString & path )
- void resetGroup ()
- void setPath ( const QString & organization, const QString & application, Scope scope = Global )
- QStringList subkeyList ( const QString & key ) const
- bool writeEntry ( const QString & key, bool value )
- bool writeEntry ( const QString & key, double value )
- bool writeEntry ( const QString & key, int value )
- bool writeEntry ( const QString & key, const char * value )
- bool writeEntry ( const QString & key, const QString & value )
- bool writeEntry ( const QString & key, const QStringList & value )
- bool writeEntry ( const QString & key, const QStringList & value, QChar separator )

- 8 public functions inherited from QObject

## Member Type Documentation

### enum QSettings::System

Constant | Value | Description
--- | --- | ---
`QSettings::Unix` | `0` | Unix systems (X11 and Qtopia Core)
`QSettings::Windows` | `1` | Microsoft Windows systems
`QSettings::Mac` | `2` | Mac OS X systems

See also insertSearchPath() and removeSearchPath().

## Member Function Documentation

### QStringList QSettings::entryList ( const QString & key ) const

Returns a list of all sub-keys of key.

Use childKeys() instead.

For example, if you have code like

        QSettings settings;
        QStringList keys = settings.entryList("cities");
        ...

you can rewrite it as

        QSettings settings;
        settings.beginGroup("cities");
        QStringList keys = settings.childKeys();
        ...
        settings.endGroup();

### void QSettings::insertSearchPath ( System system, const QString & path )

This function is implemented as a no-op. It is provided for source compatibility with Qt 3. The new QSettings class has no concept of "search path".

### bool QSettings::readBoolEntry ( const QString & key, bool defaultValue = false, bool * ok = 0 )

Returns the value for setting key converted to a `bool`. If the setting doesn't exist, returns defaultValue.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        bool grid = settings.readBoolEntry("showGrid", true, &ok);

you can rewrite it as

        bool ok = settings.contains("showGrid");
        bool grid = settings.value("showGrid", true).toBool();

### double QSettings::readDoubleEntry ( const QString & key, double defaultValue = 0, bool * ok = 0 )

Returns the value for setting key converted to a `double`. If the setting doesn't exist, returns defaultValue.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        double pi = settings.readDoubleEntry("pi", 3.141592, &ok);

you can rewrite it as

        bool ok = settings.contains("pi");
        double pi = settings.value("pi", 3.141592).toDouble();

### QString QSettings::readEntry ( const QString & key, const QString & defaultValue = QString(), bool * ok = 0 )

Returns the value for setting key converted to a QString. If the setting doesn't exist, returns defaultValue.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        QString str = settings.readEntry("userName", "administrator", &ok);

you can rewrite it as

        bool ok = settings.contains("userName");
        QString str = settings.value("userName", "administrator").toString();

### QStringList QSettings::readListEntry ( const QString & key, bool * ok = 0 )

Returns the value of setting key converted to a QStringList.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        QStringList list = settings.readListEntry("recentFiles", &ok);

you can rewrite it as

        bool ok = settings.contains("recentFiles");
        QStringList list = settings.value("recentFiles").toStringList();

### QStringList QSettings::readListEntry ( const QString & key, QChar separator, bool * ok = 0 )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Returns the value of setting key converted to a QStringList. separator is ignored.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        QStringList list = settings.readListEntry("recentFiles", ":", &ok);

you can rewrite it as

        bool ok = settings.contains("recentFiles");
        QStringList list = settings.value("recentFiles").toStringList();

### int QSettings::readNumEntry ( const QString & key, int defaultValue = 0, bool * ok = 0 )

Returns the value for setting key converted to an `int`. If the setting doesn't exist, returns defaultValue.

If ok is not 0, *ok is set to true if the key exists, otherwise *ok is set to false.

Use value() instead.

For example, if you have code like

        bool ok;
        int max = settings.readNumEntry("maxConnections", 30, &ok);

you can rewrite it as

        bool ok = settings.contains("maxConnections");
        int max = settings.value("maxConnections", 30).toInt();

### bool QSettings::removeEntry ( const QString & key )

Use remove() instead.

### void QSettings::removeSearchPath ( System system, const QString & path )

This function is implemented as a no-op. It is provided for source compatibility with Qt 3. The new QSettings class has no concept of "search path".

### void QSettings::resetGroup ()

Sets the current group to be the empty string.

Use endGroup() instead (possibly multiple times).

For example, if you have code like

        QSettings settings;
        settings.beginGroup("mainWindow");
        settings.beginGroup("leftPanel");
        ...
        settings.resetGroup();

you can rewrite it as

        QSettings settings;
        settings.beginGroup("mainWindow");
        settings.beginGroup("leftPanel");
        ...
        settings.endGroup();
        settings.endGroup();

### void QSettings::setPath ( const QString & organization, const QString & application, Scope scope = Global )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Specifies the organization, application, and scope to use by the QSettings object.

Use the appropriate constructor instead, with QSettings::UserScope instead of QSettings::User and QSettings::SystemScope instead of QSettings::Global.

For example, if you have code like

        QSettings settings;
        settings.setPath("twikimaster.com", "Kanooth", QSettings::Global);

you can rewrite it as

        QSettings settings(QSettings::SystemScope, "twikimaster.com", "Kanooth");

### QStringList QSettings::subkeyList ( const QString & key ) const

Returns a list of all sub-keys of key.

Use childGroups() instead.

For example, if you have code like

        QSettings settings;
        QStringList groups = settings.entryList("cities");
        ...

you can rewrite it as

        QSettings settings;
        settings.beginGroup("cities");
        QStringList groups = settings.childKeys();
        ...
        settings.endGroup();

### bool QSettings::writeEntry ( const QString & key, bool value )

Sets the value of setting key to value.

Use setValue() instead.

### bool QSettings::writeEntry ( const QString & key, double value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### bool QSettings::writeEntry ( const QString & key, int value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### bool QSettings::writeEntry ( const QString & key, const char * value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### bool QSettings::writeEntry ( const QString & key, const QString & value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### bool QSettings::writeEntry ( const QString & key, const QStringList & value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

### bool QSettings::writeEntry ( const QString & key, const QStringList & value, QChar separator )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Use setValue(key, value) instead. You don't need separator.