QTcpSocket->readAll() doesn't have anything to read!

I have server and client in the same client/server architecture application.

First send
Server::incommingConnection()
Buffering
"Task::handleTask strBuffer= taskToHandle---received from localhost:1591"

"RequestManager::send() response SENDING TO: localhost:1591"
RequestManager::send() CONNECTING...
RequestManager::send() CONNECTED
RequestManager::send() SENT!
New client connected


is debug output


now my problem is that it stops at New client connected and doesn't goto readyRead() infact even when I explicitely call readyRead() [my slot connected to QTcpSocket's readyRead signal] readAll() has nothing in it

following diagram is better way of describing of whats happening:

Attachment 7568

Following are some bits of my code:

Code:

---

void Server::incomingConnection(const int socketDescriptor)
{
#if (DEBUGGING)
    qDebug()<<"Server::incommingConnection()";
#endif
    client=new NetworkObjects::Client(socketDescriptor,parent_);
 
}

---

Code:

---

Client::Client(const int socketDescriptor,QObject *parent) :
    QObject(parent),
    parent_(parent)
{
    setSocketDescriptor(socketDescriptor);
    //initialize socket
    this->tcpSocket = new QTcpSocket(this);
    tcpSocket->open(QTcpSocket::ReadWrite);
 
    //connect signals/slots of socket
    QObject::connect(tcpSocket,SIGNAL(connected()),this,SLOT(connected()));
    QObject::connect(tcpSocket,SIGNAL(disconnected()),this,SLOT(disconnected()));
    QObject::connect(tcpSocket,SIGNAL(readyRead()),this,SLOT(readyRead()));
 
 
    this->tcpSocket->setSocketDescriptor(this->socketDescriptor());
    if (this->tcpSocket->waitForReadyRead(kWaitConnectingMillisecond))
        qDebug()<<"New client connected";
    else
        qDebug()<<"Error while connecting client: "+tcpSocket->errorString();
}

---

printing this tcpSocket->errorString() gives error "The remote host closed the connection".
I even tried to comment out all closing statements that closes socket (for debugging purpose) but didn't do

Code:

---

void Client::readyRead(void)
{
    qDebug()<<"Buffering";
    NetworkObjects::Task *task=new NetworkObjects::Task(parent_,tcpSocket->readAll());
    QObject::connect(task,SIGNAL(taskCompleted()),task,SLOT(deleteLater()));
    task->handleTask();
 
}

---

see the app instance 1 in above image sends request successfully and app instance 2 receives it fine and creates response

Code:

---

void RequestManager::send(QByteArray *request)
{
#if (DEBUGGING)
    qDebug()<<"RequestManager::send() " + QString(*request) + "  SENDING TO: "+address_+":"+QString::number(port_);
#endif
    sendTcpSocket->abort();
    sendTcpSocket->open(QTcpSocket::ReadWrite);
 
    sendTcpSocket->connectToHost(address_,port_);
#if (DEBUGGING)
    qDebug()<<"RequestManager::send() CONNECTING...";
#endif
 
if (sendTcpSocket->waitForConnected(3000))
{
#if (DEBUGGING)
    qDebug()<<"RequestManager::send() CONNECTED";
#endif
}
 
 
    if (sendTcpSocket->isOpen()==false){
        emit socketCannotOpen();
    }
    else if (sendTcpSocket->isWritable())
    {
 
 
        sendTcpSocket->write(*request);
 
#if (DEBUGGING)
    qDebug()<<"RequestManager::send() SENT!";
#endif
    }
 
   // sendTcpSocket->close();
 
}

---

can we please try to help me out?

thanks

no one?

can someone please reply (only if you know the answer)?

Maybe you should call waitForConnected before calling waitForReadyRead. Also consider non-blocking approach.

Attached is simple client-server demo app, see if it works for you and try to resolve your issue based on it.