Tcp/Ip client-server communication in qt c++

karthik23

Hallo

i have created tcp/ip client server communication.i can send messages from client to server. but i have a issue.. i have to display the sent message as binary on server.i am unable to do this. help will be appreciated.

@client
#include "client.h"
#include <QHostAddress>

Client::Client(QObject* parent): QObject(parent)
{
connect(this, SIGNAL(startTransferSignal(QString)), this,
SLOT(startTransfer(QString)));
connect(this, SIGNAL(startSignal(QString,quint16)), this,
SLOT(start(QString, quint16)));
connect(this, SIGNAL(Disconnect()), this, SLOT(DisconnectSlot()));
}

void Client::DisconnectSlot()
{
client.close();
}

Client::~Client()
{
client.close();
}

void Client::start(QString address, quint16 port)
{
QHostAddress addr(address);
client.connectToHost(addr, port);
}

void Client::startTransfer(QString msg)
{
quint32 length = msg.length();
client.write((char*)&length, sizeof(length));
client.write(msg.toUtf8(), msg.length());
}

@server
#include "server.h"
#include <iostream>
using namespace std;

Server::Server(QObject* parent): QObject(parent)
{
connect(&server, SIGNAL(newConnection()),
this, SLOT(acceptConnection()));
}

void Server::start()
{
server.listen(QHostAddress::Any, 8080);
}

Server::~Server()
{
server.close();
}

void Server::acceptConnection()
{
client = server.nextPendingConnection();
qDebug() << "Connected to client";

connect(client, SIGNAL(readyRead()),
this, SLOT(startRead()));
}

void Server::startRead()
{
while (1)
{
char buffer[1024] = {0};
quint32 length = 0;

  if (client->bytesAvailable() < 4)
  {
      if (!client->waitForReadyRead(-1))
          break;
  }

  client->read((char*)&length, sizeof(length));

  while (client->bytesAvailable() < length)
      client->waitForReadyRead(-1);

  quint32 read = 0;
  do
  {
    read += client->read(buffer, length);
    qDebug() << "Message received from client:" << QString::fromLatin1(buffer) << endl;

  }while (read < length);

}

client->close();
qDebug() << "Disconnected from client";
}

raven-worx

@karthik23
i don't know if i got you correct, but is this what you are looking for?

QByteArray(buffer, length).toHex();

karthik23

@raven-worx

i exactly dont know. i am new to Qt. if you can, kindly help me to figure it out.
Thank you!

raven-worx

@karthik23
i neither don't know what you want to achieve exactly.
The example i give displays the received binary data as hex values. Is that already what you want?

karthik23

@raven-worx
yeah..may be similar one. where should i insert this code exactly?

Thanks!

raven-worx

@karthik23 said:

where should i insert this code exactly?

where you need it :)
I mean u asked the question because you want to achieve something.
Since it's still not very clear what you want as the final result, i can't help you.

For testing you can add it in the line where your qDebug() calls is.