示例 2：与动态副本建立直接连接
源端无需进行任何更改，因为动态副本仅影响请求节点获取副本的方式。因此，我们使用示例 1 中展示的源端代码。
- 向项目中添加副本生成功能。
由于副本是动态获取的，因此与示例 1 不同，无需
.rep文件。 - 创建远程节点并将其连接到源主机节点。
此步骤的代码与示例 1 相同。
QRemoteObjectNode repNode; // create remote object node repNode.connectToNode(QUrl(QStringLiteral("local:replica"))); // connect with remote host node - 获取远程源对象的副本。
在
main.cpp中，我们使用QSharedPointer 来保存远程对象的副本，然后实例化一个副本请求器对象：#include <QCoreApplication> #include "dynamicclient.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QSharedPointer<QRemoteObjectDynamicReplica> ptr; // shared pointer to hold replica QRemoteObjectNode repNode; repNode.connectToNode(QUrl(QStringLiteral("local:replica"))); ptr.reset(repNode.acquireDynamic("SimpleSwitch")); // acquire replica of source from host node DynamicClient rswitch(ptr); // create client switch object and pass replica reference to it return a.exec(); }
请求器类DynamicClient 的完整声明和定义如下：
dynamicclient.h
#ifndef _DYNAMICCLIENT_H
#define _DYNAMICCLIENT_H
#include <QObject>
#include <QSharedPointer>
#include <QRemoteObjectNode>
#include <qremoteobjectdynamicreplica.h>
class DynamicClient : public QObject
{
Q_OBJECT
public:
DynamicClient(QSharedPointer<QRemoteObjectDynamicReplica> ptr);
~DynamicClient() override = default;
Q_SIGNALS:
void echoSwitchState(bool switchState);// this signal is connected with server_slot(..) slot of source object and echoes back switch state received from source
public Q_SLOTS:
void recSwitchState_slot(bool); // Slot to receive source state
void initConnection_slot(); // Slot to connect signals/slot on replica initialization
private:
bool clientSwitchState; // holds received server switch state
QSharedPointer<QRemoteObjectDynamicReplica> reptr;// holds reference to replica
};
#endifdynamicclient.cpp
#include "dynamicclient.h"
// 构造函数
DynamicClient::DynamicClient(QSharedPointer<QRemoteObjectDynamicReplica>ptr)
: QObject(nullptr),clientSwitchState(false),reptr(ptr)
{
// 通过信号槽初始化，连接复制本有效状态变化的信号
QObject::connect(reptr.data(), &QRemoteObjectDynamicReplica::initialized, this,
&DynamicClient::initConnection_slot);
}
// 用于初始化槽与信号之间连接的函数
voidDynamicClient::initConnection_slot()
{
// 将源副本信号 currStateChanged() 与客户端的
// recSwitchState() 槽 连接 ，以接收源的当前状态：
QObject::connect(reptr.data(),SIGNAL(currStateChanged(bool)), this,
SLOT(recSwitchState_slot(bool)));
// 将客户端的 echoSwitchState(..) 信号与副本的
// server_slot(..) 连接 ，以回显接收到的状态：
QObject::connect(this,SIGNAL(echoSwitchState(bool)),reptr.data(),SLOT(server_slot(bool)));
}
voidDynamicClient::recSwitchState_slot(boolvalue)
{
// 使用副本属性从源端获取“currState”：
clientSwitchState= reptr->property("currState").toBool();
qDebug() << "Received source state " << value << clientSwitchState;
// 向服务器发送信号，反馈接收到的状态：
Q_EMIT echoSwitchState(clientSwitchState);
}与源端示例一起运行时，输出结果与示例 1 完全相同。
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