QTcpSocket communication in a thread - qt

Question

I'm making two application : one is the server and one is the client. The server use QTcpServer and QThread to listen to client. The client use QThread to make a connection to server.
The server and the client successfully connected, but the problem is how to communicate data between them. On server side, I put a line to send a data to client using socket->write("hello") when a new client is connected, but the client didn't receive it. The "didn't receive" conjecture based on nothing written on calling QDebug on client side.
Also, I want to ask about how to make the client thread always ready to receive data from server but sometimes can be used to send data to server when a PushButton is used.
Any help will be appreciated.
client side main.cpp (using a widget)
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "tcpthread.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
TcpThread *tcpThread = new TcpThread(this);
connect(tcpThread, SIGNAL(finished()), tcpThread, SLOT(deleteLater()));
tcpThread->start();
}
client side tcpthread.h
#ifndef TCPTHREAD_H
#define TCPTHREAD_H
#include <QThread>
#include <QTcpSocket>
class TcpThread : public QThread
{
Q_OBJECT
public:
explicit TcpThread(QObject *parent = 0);
void run();
signals:
void error(QTcpSocket::SocketError socketError);
public slots:
void readyRead();
void disconnected();
private:
void processMessage(QByteArray message);
QTcpSocket *socket;
qintptr socketDescriptor;
QByteArray data;
};
#endif // TCPTHREAD_H
client side tcpthread.cpp
#include "tcpthread.h"
TcpThread::TcpThread(QObject *parent) :
QThread(parent)
{
}
void TcpThread::run()
{
qDebug() << "Thread started";
socket = new QTcpSocket();
connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()), Qt::DirectConnection);
connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));
socket->connectToHost("127.0.0.1",1234);
exec();
}
void TcpThread::readyRead()
{
data = socket->readAll();
while(!data.contains('\n'))
{
socket->waitForReadyRead();
data += socket->readAll();
}
int bytes = data.indexOf('\n')+1;
QByteArray message = data.left(bytes);
data = data.mid(bytes);
qDebug() << socketDescriptor << " : " << message;
processMessage(message);
}
void TcpThread::disconnected()
{
qDebug() << socketDescriptor << " disconnected";
socket->deleteLater();
exit(0);
}
void TcpThread::processMessage(QByteArray message)
{
qDebug() << message << " processed";
}
server side main.cpp
#include "tcpserver.h"
#include <QCoreApplication>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
TcpServer tcpServer;
tcpServer.startServer();
return a.exec();
}
server side tcpthread.h
#ifndef TCPTHREAD_H
#define TCPTHREAD_H
#include <QThread>
#include <QTcpSocket>
#include <QDebug>
class TcpThread : public QThread
{
Q_OBJECT
public:
explicit TcpThread(qintptr ID, QObject *parent = 0);
void run();
signals:
void error(QTcpSocket::SocketError socketError);
public slots:
void readyRead();
void disconnected();
private:
void processMessage(QByteArray message);
QTcpSocket *socket;
qintptr socketDescriptor;
QByteArray data;
};
#endif // TCPTHREAD_H
server side tcpthread.cpp
#include "tcpthread.h"
TcpThread::TcpThread(qintptr ID, QObject *parent) :
QThread(parent)
{
this->socketDescriptor = ID;
}
void TcpThread::run()
{
qDebug() << "Thread started";
socket = new QTcpSocket();
if(!socket->setSocketDescriptor(this->socketDescriptor))
{
emit error(socket->error());
return;
}
connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()), Qt::DirectConnection);
connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));
qDebug() << socketDescriptor << " connected";
socket->write("hello");
exec();
}
void TcpThread::readyRead()
{
data = socket->readAll();
while(!data.contains('\n'))
{
socket->waitForReadyRead();
data += socket->readAll();
}
int bytes = data.indexOf('\n')+1;
QByteArray message = data.left(bytes);
data = data.mid(bytes);
qDebug() << socketDescriptor << " : " << message;
processMessage(message);
//socket->write(data);
}
void TcpThread::disconnected()
{
qDebug() << socketDescriptor << " disconnected";
socket->deleteLater();
exit(0);
}
void TcpThread::processMessage(QByteArray message)
{
qDebug() << message << " processed";
}