Qt QTcpSocket读取数据时不发出信号

Question

I need to update the content of a chat window when it receives a message. Here are the two functions I use :

void LinPop::_createChat(Client *socket)
{
    ChatDialog *chat = new ChatDialog();

    chat->setAttribute(Qt::WA_DeleteOnClose);
    qDebug() << "Connecting chat : ";
    qDebug() << connect(chat, SIGNAL(toSend(QString&)), socket, SLOT(send(QString&)));
    qDebug() << connect(socket, SIGNAL(gotTexted(QString)), chat, SLOT(updateChat(QString)));
    chat->exec();
}

This is the slot that is called when the socket has something to read. It works fine, except the signal either isn't emitted or the connected slot isn't called.

void Client::readyRead()
{
    if (this->_socket->bytesAvailable() > 0)
    {
        QByteArray data = this->_socket->readAll();
        QString text(data);

        emit gotTexted(text);
        qDebug() << "ReadyRead [" << text << "] [" << this->_socket->bytesAvailable() << "]";
    }
}

Console output :

Connecting chat :  
true 
true 
Sent [ "Test" ] 
ReadyRead [ "Test" ] [ 0 ] 

Now, if I do this, it goes into an infinite loop but suddenly the signal/slot thing works just fine and my text gets sent to the chat window and displayed :

void Client::readyRead()
{
    if (this->_socket->bytesAvailable() > 0)
    {
        QByteArray data = this->_socket->readAll();
        QString text(data);
        this->_socket->write(data); // Added this

        emit gotTexted(text);
        qDebug() << "ReadyRead [" << text << "] [" << this->_socket->bytesAvailable() << "]";
    }
}

Console output :

Connecting chat :  
true 
true 
Sent [ "Test" ] 
ReadyRead [ "Test" ] [ 0 ] 
Update Chat [ "Test" ] 
ReadyRead [ "Test" ] [ 0 ]
// Infinite Loop

I don't understand why it doesn't work in the first place or why, when I turn it into an infinite loop, it suddenly starts working...

PS : Here is the updateChat slot :

void ChatDialog::updateChat(QString text)
{
    this->ui->tbConv->insertPlainText(text);
    qDebug() << "Update Chat [" << text << "]";
}

Answer 1

How do you perform socket connection? I cant get code responsible for listening for connection. If you dont have any other tcp client try with telnet