//client .pro

#-------------------------------------------------
#
# Project created by QtCreator 2017-02-06T16:50:14
#
#-------------------------------------------------

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = client
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which as been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui


// client .h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTcpSocket>
#include <QDataStream>
#include <QMessageBox>
#include <QHostAddress>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void on_btnConnect_clicked();
    void displayError(QAbstractSocket::SocketError socketError);
    void readSocket();
    void clientDisconnected();

    void on_btnSend_clicked();

private:
    Ui::MainWindow *ui;

    QTcpSocket *tcpSocket;
    QDataStream in;
};

#endif // MAINWINDOW_H


//client .cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    tcpSocket = new QTcpSocket(this);
    in.setDevice(tcpSocket);
    in.setVersion(QDataStream::Qt_4_0);
    connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readSocket()));
    connect(tcpSocket, SIGNAL(disconnected()), this, SLOT(clientDisconnected()));
    connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(displayError(QAbstractSocket::SocketError)));
}

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

void MainWindow::on_btnConnect_clicked()
{
    tcpSocket->connectToHost(QHostAddress("127.0.0.1"), 5000);
    if (tcpSocket->waitForConnected()) {
        ui->lblState->setText("Connected to Server");
    }
    else{
        ui->lblState->setText("Failed to connect");
    }

    if (!tcpSocket->isValid()) {
        qDebug() << "tcp socket invalid";
        return;
    }
    if (!tcpSocket->isOpen()) {
        qDebug() << "tcp socket not open";
        return;
    }

    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_0);

    out << ui->edtText->text();

    //        QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
    //        connect(clientSocket, &QAbstractSocket::disconnected,
    //                clientConnection, &QObject::deleteLater);

    if (!tcpSocket->write(block)){
        QMessageBox::information(this, tr("Client"),tr("Could not send message"));
    }

}

void MainWindow::displayError(QAbstractSocket::SocketError socketError)
{
    switch (socketError) {
    case QAbstractSocket::RemoteHostClosedError:
        break;
    case QAbstractSocket::HostNotFoundError:
        QMessageBox::information(this, tr("Fortune Client"),
                                 tr("The host was not found. Please check the "
                                    "host name and port settings."));
        break;
    case QAbstractSocket::ConnectionRefusedError:
        QMessageBox::information(this, tr("Fortune Client"),
                                 tr("The connection was refused by the peer. "
                                    "Make sure the fortune server is running, "
                                    "and check that the host name and port "
                                    "settings are correct."));
        break;
    default:
        QMessageBox::information(this, tr("Fortune Client"),
                                 tr("The following error occurred: %1.")
                                 .arg(tcpSocket->errorString()));
    }

}

void MainWindow::readSocket()
{
    in.startTransaction();

    QString instring;
    in >> instring;

    if (in.commitTransaction()){
        ui->lblRecieved->setText(instring);
    }
    else{
        ui->lblRecieved->setText("Error reading from datastream");
    }
}

void MainWindow::on_btnSend_clicked()
{
    if (!tcpSocket->isValid()) {
        qDebug() << "tcp socket invalid";
        return;
    }
    if (!tcpSocket->isOpen()) {
        qDebug() << "tcp socket not open";
        return;
    }

    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_4_0);

    out << ui->edtText->text();

    //        QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
    //        connect(clientSocket, &QAbstractSocket::disconnected,
    //                clientConnection, &QObject::deleteLater);

    if (!tcpSocket->write(block)){
        QMessageBox::information(this, tr("Client"),tr("Could not send message"));
    }
    //        clientConnection->disconnectFromHost();
}

void MainWindow::clientDisconnected(){
    QMessageBox::information(this, tr("Client"),tr("Disconnected from Server"));
}


//client .ui
<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>483</width>
    <height>305</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralWidget">
   <widget class="QPushButton" name="btnSend">
    <property name="geometry">
     <rect>
      <x>320</x>
      <y>140</y>
      <width>80</width>
      <height>22</height>
     </rect>
    </property>
    <property name="text">
     <string>Send Text</string>
    </property>
   </widget>
   <widget class="QLineEdit" name="edtText">
    <property name="geometry">
     <rect>
      <x>20</x>
      <y>140</y>
      <width>291</width>
      <height>22</height>
     </rect>
    </property>
   </widget>
   <widget class="QLabel" name="lblRecieved">
    <property name="geometry">
     <rect>
      <x>20</x>
      <y>100</y>
      <width>331</width>
      <height>16</height>
     </rect>
    </property>
    <property name="text">
     <string>Recieved Text</string>
    </property>
   </widget>
   <widget class="QPushButton" name="btnConnect">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>20</y>
      <width>151</width>
      <height>31</height>
     </rect>
    </property>
    <property name="text">
     <string>Connect to Server</string>
    </property>
   </widget>
   <widget class="QLabel" name="lblState">
    <property name="geometry">
     <rect>
      <x>200</x>
      <y>30</y>
      <width>121</width>
      <height>16</height>
     </rect>
    </property>
    <property name="text">
     <string>State</string>
    </property>
   </widget>
  </widget>
  <widget class="QMenuBar" name="menuBar">
   <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>483</width>
     <height>19</height>
    </rect>
   </property>
   <widget class="QMenu" name="menuClient">
    <property name="title">
     <string>Client</string>
    </property>
   </widget>
   <addaction name="menuClient"/>
  </widget>
  <widget class="QToolBar" name="mainToolBar">
   <attribute name="toolBarArea">
    <enum>TopToolBarArea</enum>
   </attribute>
   <attribute name="toolBarBreak">
    <bool>false</bool>
   </attribute>
  </widget>
  <widget class="QStatusBar" name="statusBar"/>
 </widget>
 <layoutdefault spacing="6" margin="11"/>
 <resources/>
 <connections/>
</ui>