- Qt 6.10
- Qt Remote Objects
- C++ Classes
- QRemoteObjectAbstractPersistedStore
- Qt 6.10.2 Reference Documentation

# QRemoteObjectAbstractPersistedStore Class

A class which provides the methods for setting PROP values of a replica to value they had the last time the replica was used. More...

Header: | `#include <QRemoteObjectAbstractPersistedStore>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS RemoteObjects)` `target_link_libraries(mytarget PRIVATE Qt6::RemoteObjects)`
qmake: | `QT += remoteobjects`

- List of all members, including inherited members

## Public Functions

| QRemoteObjectAbstractPersistedStore(QObject *parent = nullptr)
virtual QVariantList | restoreProperties(const QString &repName, const QByteArray &repSig) = 0
virtual void | saveProperties(const QString &repName, const QByteArray &repSig, const QVariantList &values) = 0

## Detailed Description

This can be used to provide a "reasonable" value to be displayed until the connection to the source is established and current values are available.

This class must be overridden to provide an implementation for saving (QRemoteObjectAbstractPersistedStore::saveProperties) and restoring (QRemoteObjectAbstractPersistedStore::restoreProperties) PROP values. The derived type can then be set for a node, and any replica acquired from that node will then automatically store PERSISTED properties when the replica destructor is called, and retrieve the values when the replica is instantiated.

## Member Function Documentation

### QRemoteObjectAbstractPersistedStore::QRemoteObjectAbstractPersistedStore(QObject *parent = nullptr)

Constructs a QRemoteObjectAbstractPersistedStore with the given parent. The default value of parent is `nullptr`.

### `[pure virtual]` QVariantList QRemoteObjectAbstractPersistedStore::restoreProperties(const QString &repName, const QByteArray &repSig)

This method will be provided the replica class's repName and repSig when the replica is being initialized. It is the responsibility of the inheriting class to get the last values persisted by QRemoteObjectAbstractPersistedStore::saveProperties and return them. An empty QVariantList should be returned if no values are available.

See also QRemoteObjectAbstractPersistedStore::saveProperties.

### `[pure virtual]` void QRemoteObjectAbstractPersistedStore::saveProperties(const QString &repName, const QByteArray &repSig, const QVariantList &values)

This method will be provided the replica class's repName, repSig and the list of values that PERSISTED properties have when the replica destructor was called. It is the responsibility of the inheriting class to store the information in a manner consistent for QRemoteObjectAbstractPersistedStore::restoreProperties to retrieve.

See also QRemoteObjectAbstractPersistedStore::restoreProperties.