#include <QtGui/QApplication>
#include "wgtmain.h"
#include "thread.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    wgtMain w;
    w.show();

    Thread th;
    th.start();

    return a.exec();
}

#ifndef THREAD_H
#define THREAD_H

#include <QThread>
#include <QtNetwork/QTcpSocket>

class Thread : public QThread
{
    Q_OBJECT

    QTcpSocket * sock;
public:
    explicit Thread(QObject *parent = 0);
protected:
    void run();
};

#endif // THREAD_H

#include "thread.h"

Thread::Thread(QObject *parent) :
    QThread(parent)
{
    this->sock = new QTcpSocket(this);
    this->sock->connectToHost("127.0.0.1", 1234);
}

void Thread::run()
{
    while(true)
    {
        QByteArray array = this->sock->readAll();

        if(array.length() > 0)
        {
            if(array.data() == "somedata")
                this->sock->write("somedata_to_send");
        }
    }
}

#ifndef WGTMAIN_H
#define WGTMAIN_H

#include <QWidget>
#include <QTcpSocket>

namespace Ui {
    class wgtMain;
}

class wgtMain : public QWidget
{
    Q_OBJECT

public:
    explicit wgtMain(QWidget *parent = 0);
    ~wgtMain();

private slots:
    void on_pushButton_clicked();

private:
    Ui::wgtMain *ui;
};

#endif // WGTMAIN_H

#include "wgtmain.h"
#include "ui_wgtmain.h"

wgtMain::wgtMain(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::wgtMain)
{
    ui->setupUi(this);
}

wgtMain::~wgtMain()
{
    delete ui;
}

void wgtMain::on_pushButton_clicked()
{
    QTcpSocket sock (this);
    sock.connectToHost("127.0.0.1", 1234);
    sock.write("some_data_to_sent_from_slot");
    sock.disconnectFromHost();
}