QT QTcpServer :: incomingConnection(qintptr句柄)没有触发？

Question

我正在尝试第一次使用Qt创建一个多线程服务器.通常会使用QTcpServer::nextPendingConnection()已经烘焙的套接字句柄返回的套接字指针- 但由于我在单独的线程上与连接客户端连接,我需要使用qintptr handlefrom QTcpServer :: incomingConnection(qintptr handle)单独创建套接字).经过一个非常沉闷,错误打包的调试会话后,我设法将问题追踪到了QTcpServer::incomingConnection()永远不会被解雇？

有没有人有类似的问题 - 最新版本Qt有什么变化？

这些是我尝试过的:

• QTcpServer::incomingConnection(qintptr handle)
• QTcpServer::incomingConnection(qintptr socketDescriptor)
• QTcpServer::incomingConnection(int handle)

编辑:

创建服务器实例:

TestServer *myServer = new TestServer();
myServer->initializeServer(1234);

哪个电话:

void TestServer::initializeServer(quint16 port)
{

mainServer = new QTcpServer(this);

mainServer->listen(QHostAddress::Any, port);

qDebug() << "Listening for connections on port: " << port;



}

服务器正在侦听.当客户端连接incomingConnection(qintptr句柄)应该被调用:

void TestServer::incomingConnection(qintptr socketDescriptor){

TestClient *client = new TestClient(this);
client->setSocket(socketDescriptor);

}

哪个电话:

void TestClient::setSocket(quint16 socketDescr)
{
socket = new QTcpSocket(this);

socket->setSocketDescriptor(socketDescr);

connect(socket, SIGNAL(connected()),this,SLOT(connected()));
connect(socket, SIGNAL(disconnected()),this,SLOT(disconnected()));
connect(socket, SIGNAL(readyRead()),this,SLOT(readyRead()));



}

在connect()信号上调用:

void TestClient::connected()
{   
qDebug() << "Client connected..."; // This debug never appears in the console, since QTcpServer::incomingConnection isn't being fired.

}

Answer 1

您的代码有一些错误:

1. 在TestServer 您QTcpServer可能已聚合,但您需要继承它.在这种情况下,您尝试覆盖incomingConnection()方法,但您没有基类,您只需创建新的incomingConnection(),而不是覆盖.
2. 你得到qintptr descriptor变量incomingConnection(),但quint16在setSocket()方法中设置类型.
3. 您可能混合了部件的服务器和客户端的客户端,这只是获取传入连接和处理套接字数据.

我在下面写了一些小例子,以便您了解tcp客户端 - 服务器通信.

服务器部分

主要部分是服务器本身:

#include <QTcpServer>

class TestServer: public QTcpServer
{
public:
    TestServer(QObject *parent = 0);
    void incomingConnection(qintptr handle) Q_DECL_OVERRIDE;
};

看看:我没有加重QTcpServer,但继承了它.在这种情况下,您可以incomingConnection()正确覆盖方法.在构造函数中,我们只使用listen()方法启动服务器进行监听:

TestServer::TestServer(QObject *parent):
    QTcpServer(parent)
{
    if (this->listen(QHostAddress::Any, 2323)) {
        qDebug() << "Server start at port: " << this->serverPort();
    } else {
        qDebug() << "Start failure";
    }
}

然后覆盖的时间incomingConnection():

void TestServer::incomingConnection(qintptr handle)
{
    qDebug() << Q_FUNC_INFO << " new connection";
    SocketThread *socket = new SocketThread(handle);

    connect(socket, SIGNAL(finished()), socket, SLOT(deleteLater()));
    socket->start();
}

我创建了SocketThread处理传入数据的对象:

#include <QThread>
#include <QObject>

class QTcpSocket;

class SocketThread: public QThread
{
    Q_OBJECT
public:
    SocketThread(qintptr descriptor, QObject *parent = 0);
    ~SocketThread();

protected:
    void run() Q_DECL_OVERRIDE;

private slots:
    void onConnected();
    void onReadyRead();
    void onDisconnected();

private:
    QTcpSocket *m_socket;
    qintptr m_descriptor;
};

我们继承QThread了使我们的服务器多线程,所以我们必须覆盖run()方法:

SocketThread::SocketThread(qintptr descriptor, QObject *parent)
    :  QThread(parent), m_descriptor(descriptor)
{

}

void SocketThread::run()
{
    qDebug() << Q_FUNC_INFO;
    m_socket = new QTcpSocket;
    m_socket->setSocketDescriptor(m_descriptor);

    connect(m_socket, SIGNAL(readyRead()),    this, SLOT(onReadyRead()), Qt::DirectConnection);
    connect(m_socket, SIGNAL(disconnected()), this, SLOT(onDisconnected()), Qt::DirectConnection);

    exec();
}

这样我们初始化我们的QTcpSocket设置套接字描述符,连接它readyRead()并disconnected()发出信号并启动事件循环.

void SocketThread::onReadyRead()
{
    QDataStream in(m_socket);
    in.setVersion(QDataStream::Qt_5_5);

    QString message;
    in >> message;
    qDebug() << message;

    m_socket->disconnectFromHost();
}

void SocketThread::onDisconnected()
{
    m_socket->close();
    // Exit event loop
    quit();
}

在onReadyRead()刚看了一些QString从客户端,写它从主机控制台和断开.在onDisconnected()我们关闭套接字连接和退出事件循环.

客户端部分

它只是示例和难闻的风格,但我在MainWindow类QPushButton::clicked信号上创建了与服务器的连接:

void MainWindow::on_pushButton_clicked()
{
    QTcpSocket *client = new QTcpSocket;
    connect(client, SIGNAL(connected()), this, SLOT(connected()));
    connect(client, SIGNAL(disconnected()), client, SLOT(deleteLater()));

    client->connectToHost(QHostAddress::LocalHost, 2323);
    client->waitForConnected();

    if (client->state() != QAbstractSocket::ConnectedState ) {
        qDebug() << Q_FUNC_INFO << " can't connect to host";
        delete client;
        return;
    }
    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_5);
    out << QString("Hello");
    out.device()->seek(0);
    client->write(block);
}

void MainWindow::connected()
{
    qDebug() << Q_FUNC_INFO << " client connected";
}

我创建新的QTcpSocket,连接到信号并尝试连接到主机(在我的情况下,它是localhost).等待连接并检查插座状态.如果一切正常我会写入socket QString- 只是示例.

这是组织多线程客户端 - 服务器架构的可能方法之一,我希望它对您有所帮助,并找到您的错误.