Server connected with client in tcp communication in Qt but not receiving data from client.

Nitika

I am developing an application in TCP in Qt communicating with each other. Server(receiver) gets connected with the client(sender) through "connectToHost" command and the client is writing 6 bytes of data to server but the server is not able to enter into the function reading the data from the client after getting ReadyRead() signal. Kindly suggest the improvement I should make in the code to read the data from the client.

//client.h

#ifndef PROJB_H
#define PROJB_H

#include <QObject>
#include <QTcpServer>
#include <QTcpSocket>
#include <QtNetwork>
#include <QHostAddress>

class Client:public QObject
{
Q_OBJECT
public:
explicit Client(QObject *parent = 0);
// void connectreq();

signals:
public slots:
void connected();
void disconnected();

private:

QTcpServer* server_to_rec;
QTcpServer* server_to_send;
QTcpSocket *socket_to_send;
QTcpSocket* socket_to_rec;

};

#endif // PROJB_H

//client.cpp
#include <QTcpServer>
#include <QTcpSocket>
#include <QHostAddress>

#include "ProjB.h"

Client::Client(QObject *parent):QObject(parent)
{
socket_to_send = new QTcpSocket(this); //for sending
qDebug()<<"socket "<<socket_to_send<<" created";

socket_to_send->connectToHost("192.168.3.55",18006);

connect(socket_to_send, SIGNAL(connected()), this, SLOT(connected())) ;

connect(socket_to_send, SIGNAL(disconnected()), this, SLOT(disconnected())) ;

}

void Client::connected()
{
int bytes;
QByteArray buff("client");

qDebug()<<"Connection established";
while(1)
{
   bytes =socket_to_send->write(buff);
   qDebug()<<"data sent:"<<bytes<<"bytes";
    sleep(5);
}

}

void Client::disconnected()
{
qDebug()<<"trying to reestablish connection";
socket_to_send->connectToHost("192.168.3.55",18006);
}

//output of client
sender output:

Starting /root/Desktop/26062013/ProjB-build-Desktop-Debug/ProjB...
socket QTcpSocket(0x8c6aa28) created
Connection established
data sent: 6 bytes
data sent: 6 bytes
data sent: 6 bytes
data sent: 6 bytes

//server.h
#ifndef PROJA_H
#define PROJA_H

#include <QObject>
#include <QTcpServer>
#include <QTcpSocket>
#include <QtNetwork>

class Server: public QObject
{
Q_OBJECT
public:
explicit Server(QObject *parent = 0);

QTcpServer* server_to_rec;
QTcpSocket* socket_to_rec;

//signals:
public slots:

void ReadData();
void incomingConnection();

private:
};

#endif // PROJA_H

//server.cpp
#include "ProjA.h"

#include <QTcpServer>
#include <QTcpSocket>
#include <QHostAddress>

Server::Server(QObject *parent):QObject(parent)
{
server_to_rec = new QTcpServer(); //for receiving
qDebug()<<"server "<<server_to_rec<<" created";

if((server_to_rec->listen(QHostAddress::Any,18006))==TRUE)
    qDebug()<<"listen successful";
else
    qDebug()<<"listen failed";
connect(server_to_rec,SIGNAL(newConnection()),this,SLOT(incomingConnection()));

}

void Server::incomingConnection()
{
socket_to_rec =server_to_rec->nextPendingConnection();
while(!socket_to_rec)
{
qDebug()<<"Trying to Connect"<<endl;
socket_to_rec =server_to_rec->nextPendingConnection();
sleep(5);
}
qDebug()<<"socket "<<socket_to_rec<<" created";
connect(socket_to_rec, SIGNAL(readyRead()), this, SLOT(ReadData())) ;
}

void Server::ReadData()
{
qDebug()<<"start reading";
while(socket_to_rec->bytesAvailable()>0)//canReadLine())

{
    char buffer[1024]={0};
    socket_to_rec->read(buffer, socket_to_rec->bytesAvailable());
    qDebug()<<"buffer data:"<<QByteArray(buffer,70).toHex();
}

}

//output of server
Starting /root/Desktop/ProjA-build-Desktop-Debug/ProjA...
server QTcpServer(0x9a238e8) created
listen successful
socket QTcpSocket(0x9a2d180) created

mcosta

Hi,

please, edit your post formatting code correctly

SGaist

Hi and welcome to devnet,

Please enclose your code between coding tags. That will make your code readable.

From what I saw, your are not connecting anything. For example:

@connect(server_to_rec,SIGNAL),this,SLOT));@

This line shouldn't even compile

Have a look at the fortune example, it shows how to do what you want to achieve.

KA51O

[quote author="SGaist" date="1372318994"]Hi and welcome to devnet,

Please enclose your code between coding tags. That will make your code readable.

From what I saw, your are not connecting anything. For example:

@connect(server_to_rec,SIGNAL),this,SLOT));@

This line shouldn't even compile

Have a look at the fortune example, it shows how to do what you want to achieve.[/quote]
If you hover your mouse over those connect parameters you can see the actual signals and slots. Its just a formating thing because he didn't enclose his code with '@' tags.

SGaist

[quote author="KA51O" date="1372322638"]
If you hover your mouse over those connect parameters you can see the actual signals and slots. Its just a formating thing because he didn't enclose his code with '@' tags.
[/quote]

My bad, thanks for the tip :)