给我介绍几种qt进程间通信的方式的代码

1. 信号与槽机制

发送者代码：

// 发送者
void Sender::sendData() {
    QString data = "Hello Receiver!";
    emit sendData(data);
}

接收者代码：

// 接收者
Receiver::Receiver() {
    connect(this, &Receiver::sendData, this, &Receiver::receiveData);
}

void Receiver::receiveData(QString data) {
    qDebug() << "Received data: " << data;
}

2. 共享内存

创建共享内存：

// 创建共享内存
QSharedMemory sharedMemory("MySharedMemory");
if (!sharedMemory.create(sizeof(int))) {
    qDebug() << "Unable to create shared memory segment";
    return;
}

写入共享内存：

// 写入共享内存
int* sharedData = static_cast<int*>(sharedMemory.data());
*sharedData = 42;

读取共享内存：

// 读取共享内存
int* sharedData = static_cast<int*>(sharedMemory.data());
int data = *sharedData;
qDebug() << "Data from shared memory: " << data;

3. 本地套接字

服务端代码：

// 服务端
QLocalServer* server = new QLocalServer();
server->listen("MyLocalSocket");

connect(server, &QLocalServer::newConnection, [=]() {
    QLocalSocket* socket = server->nextPendingConnection();
    connect(socket, &QLocalSocket::readyRead, [=]() {
        qDebug() << "Received data: " << socket->readAll();
    });
});

客户端代码：

// 客户端
QLocalSocket* socket = new QLocalSocket();
socket->connectToServer("MyLocalSocket");

if (socket->waitForConnected()) {
    socket->write("Hello server!");
}

4. D-Bus

服务端代码：

// 服务端
QDBusConnection connection = QDBusConnection::sessionBus();
connection.registerObject("/com/MyApp", this);
connection.registerService("com.MyApp");

// 实现接口方法
QString MyApp::echo(const QString& message) {
    return message;
}

客户端代码：

// 客户端
QDBusConnection connection = QDBusConnection::sessionBus();
QDBusInterface interface("com.MyApp", "/com/MyApp", "com.MyApp");

// 调用接口方法
QDBusReply<QString> reply = interface.call("echo", "Hello server!");
if (reply.isValid()) {
    qDebug() << "Received reply: " << reply.value();
}