Question

我一直在Linux机器上通过ssh命令连接到网络：

ssh user@host.colo.edu

然后我在终端中提示输入密码：

mypassword

此时，我已连接到网络。然后，我使用以下命令运行netcat（一个简单的Unix实用程序，使用TCP或UDP协议跨网络连接读取和写入数据）：

nc -l -p 1313

其中1313是端口号，JSON消息开始出现在我的终端窗口中。我想用Qt得到类似的结果。我愿意接受建议，但我相信我需要将QTcpSocket与QNetwork Proxy一起使用。这是我的mainwindow.cpp（我已经将主机，用户和密码更改为通用的）：

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    serverSocket = new QTcpSocket(this);
    connect(serverSocket,SIGNAL(readyRead()),this,SLOT(readyReadSlot()));
    connect(serverSocket,SIGNAL(connected()),this,SLOT(connectedSlot()));
    connect(serverSocket, SIGNAL(hostFound()),this,SLOT(hostFoundSlot()));
    connect(serverSocket,SIGNAL(error(QAbstractSocket::SocketError)),this,SLOT(errorSlot(QAbstractSocket::SocketError)));
    connect(serverSocket,SIGNAL(proxyAuthenticationRequired(QNetworkProxy,QAuthenticator*)),this,SLOT(proxyAuthenticationRequiredSlot(QNetworkProxy,QAuthenticator*)));
    connect(serverSocket,SIGNAL(stateChanged(QAbstractSocket::SocketState)),this,SLOT(stateChangedSlot(QAbstractSocket::SocketState)));
    QNetworkProxy proxy;
    proxy.setHostName("host.colo.edu");
    proxy.setPort(1313);
    proxy.setUser("user");
    proxy.setPassword("mypassword");
    serverSocket->setProxy(proxy);
    serverSocket->connectToHost("host.colo.edu",1313);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::readyReadSlot()
{
    qDebug() << "reading...";
    while (!serverSocket->atEnd())
    {
     QByteArray data = serverSocket->read(100);
     int istop = 0;
    }
}

void MainWindow::connectedSlot()
{
    qDebug() << "connected...";
}

void MainWindow::hostFoundSlot()
{
    qDebug() << "found host...";
}

void MainWindow::errorSlot(QAbstractSocket::SocketError)
{
    qDebug() << "an error...";
}

void MainWindow::proxyAuthenticationRequiredSlot(QNetworkProxy, QAuthenticator *)
{
    qDebug() << "authentication...";
}

void MainWindow::stateChangedSlot(QAbstractSocket::SocketState socketState)
{
    qDebug() << "state changed...";
}

这是我的mainwindow.h：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTcpSocket>
#include <QNetworkProxy>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

    QTcpSocket *serverSocket;
public slots:
    void readyReadSlot();
    void connectedSlot();
    void hostFoundSlot();
    void errorSlot(QAbstractSocket::SocketError);
    void proxyAuthenticationRequiredSlot(QNetworkProxy,QAuthenticator*);
    void stateChangedSlot(QAbstractSocket::SocketState socketState);
private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

以下是debug的输出：

Debugging starts
state changed...
state changed...
found host...
state changed...
connected...
Debugging has finished

我没有任何错误或身份验证请求，但readyRead信号永远不会发出，而readyReadSlot永远不会被调用？我错过了什么吗？

连接时QTcpSocket永远不会发出readyRead

0 个答案: