Qt Remote Objects (QtRO) is an inter-process communication (IPC) module developed for Qt. The idea is to extend Qt's existing functionalities to enable an easy exchange of information between processes or computers.
One of the key features of Qt to enable this is the distinction between an object's API (defined by its properties, signals and slots) and the implementation of that API. The purpose of QtRO is to meet the expected API, even if the true QObject is in a different process. A slot called on a copy of an object (called a Replica in QtRO) is forwarded to the true object (called a 源 in QtRO) for handling. Updates to the 源 (either property changes or emitted signals) are forwarded to every Replica .
A Replica 是轻量级代理对于 源 object, but one that supports the same connections and behavior of QObjects, which makes it as easy to use as any other QObject provided by Qt. Everything needed for the Replica to look like the 源 object is handled behind the scenes by QtRO.
Note that Remote Objects behave differently from traditional remote procedure call (RPC) implementations. In RPC, the client makes a request and waits for the response. In RPC, the server does not push anything to the client unless it is in response to a request. The design of RPC is often such that different clients are independent of each other (for instance, two clients can ask a mapping service for directions and get different results). While it is possible to implement this in QtRO (as 源 without properties, and slots that have return values), it is designed more to hide the fact that the processing is really remote. You let a node give you the Replica instead of creating it yourself, possibly use the status signals ( isReplicaValid() ), but then interact with the object like you would with any other QObject 基类型。
To enable Qt Remote Objects in a project, add this directive into the C++ files:
#include <QtRemoteObjects>
To link against the Qt Remote Objects module, add this line to the project file:
QT += remoteobjects
Qt Remote Objects 在商业许可下是可用的来自 Qt 公司 。此外，它是可用的根据 GNU LGPL (次一般公共许可) 第 3 版 ，或 GNU GPL (一般公共许可) 第 2 版 。见 Qt 许可 进一步了解细节。