Dépôt versions Qt sockets UDP en réception

À la suite de la publication du support sur l'utilisation des sockets en
langage C, voici deux déclinaisons du programme serveur UDP.

Comme ces programmes s'adressent à un public de débutant, on propose une
première version qui utilise juste les appels de bibliothèques Qt sans aucune
«interaction» graphique puis une seconde version avec une fenêtre dans laquelle
les messages ainsi que les adresses IP et numéros de port des émetteurs
s'affichent.

dev/qtcreator/gui-udp-receiver/gui-udp-receiver.pro

@@ -0,0 +1,19 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2012-02-26T20:55:23
+#
+#-------------------------------------------------
+
+QT       += core gui
+QT       += network
+
+TARGET = gui-udp-receiver
+TEMPLATE = app
+
+
+SOURCES += main.cpp\
+        mainwindow.cpp
+
+HEADERS  += mainwindow.h
+
+FORMS    += mainwindow.ui

dev/qtcreator/gui-udp-receiver/main.cpp

@@ -0,0 +1,12 @@
+#include <QtGui/QApplication>
+#include "mainwindow.h"
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+
+    w.show();
+
+    return a.exec();
+}

dev/qtcreator/gui-udp-receiver/mainwindow.cpp

@@ -0,0 +1,56 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+#include <QtCore/QTextStream>
+#include <QtCore/QDebug>
+#include <QtNetwork>
+
+MainWindow::MainWindow(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::MainWindow)
+{
+
+    listenSocket = new QUdpSocket(this);
+
+    if (listenSocket->bind(QHostAddress::Any, 8888) < 0) {
+            qDebug("Impossible de créer le socket en écoute");
+            exit(1);
+    }
+
+    ui->setupUi(this);
+
+    QObject::connect(listenSocket, SIGNAL(readyRead()),
+                this, SLOT(processPendingDatagrams()));
+
+    QObject::connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(close()));
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
+void MainWindow::processPendingDatagrams()
+ {
+
+    while (listenSocket->hasPendingDatagrams())  {
+        QByteArray datagram;
+        datagram.resize(listenSocket->pendingDatagramSize());
+        listenSocket->readDatagram(datagram.data(), datagram.size(), &senderAddress, &senderPort);
+
+        msg = datagram.data();
+        ui->senderLabel->setText(tr("Depuis : %1:%2") .arg(senderAddress.toString()) .arg(senderPort));
+        ui->msgLabel->setText(tr("Message : \"%1\"").arg(msg));
+
+        msg = msg.toUpper();
+        qDebug() << datagram.data();
+
+        datagram.clear();
+        datagram.append(msg);
+
+        if (listenSocket->writeDatagram(datagram, senderAddress, senderPort) < 0) {
+            qDebug("Émission du message modifié impossible");
+            listenSocket->close();
+            exit(1);
+        }
+    }
+}

dev/qtcreator/gui-udp-receiver/mainwindow.h

@@ -0,0 +1,35 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QtGui>
+#include <QtCore/QTextStream>
+#include <QtCore/QDebug>
+#include <QtNetwork>
+
+namespace Ui {
+    class MainWindow;
+}
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit MainWindow(QWidget *parent = 0);
+    ~MainWindow();
+
+private slots:
+    void processPendingDatagrams();
+
+private:
+    Ui::MainWindow *ui;
+    QLabel *senderLabel, *msgLabel;
+    QUdpSocket *listenSocket;
+    QHostAddress senderAddress;
+    quint16 senderPort;
+    QString msg;
+
+};
+
+#endif // MAINWINDOW_H

dev/qtcreator/gui-udp-receiver/mainwindow.ui

@@ -0,0 +1,96 @@
+<?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>1054</width>
+    <height>231</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <widget class="QFrame" name="frame">
+    <property name="geometry">
+     <rect>
+      <x>30</x>
+      <y>10</y>
+      <width>991</width>
+      <height>91</height>
+     </rect>
+    </property>
+    <property name="frameShape">
+     <enum>QFrame::StyledPanel</enum>
+    </property>
+    <property name="frameShadow">
+     <enum>QFrame::Raised</enum>
+    </property>
+    <widget class="QLabel" name="senderLabel">
+     <property name="geometry">
+      <rect>
+       <x>20</x>
+       <y>10</y>
+       <width>471</width>
+       <height>31</height>
+      </rect>
+     </property>
+     <property name="text">
+      <string>Emetteur</string>
+     </property>
+    </widget>
+    <widget class="QLabel" name="msgLabel">
+     <property name="geometry">
+      <rect>
+       <x>20</x>
+       <y>50</y>
+       <width>921</width>
+       <height>19</height>
+      </rect>
+     </property>
+     <property name="text">
+      <string>Attente d'un nouveau message</string>
+     </property>
+    </widget>
+   </widget>
+   <widget class="QPushButton" name="pushButton">
+    <property name="geometry">
+     <rect>
+      <x>40</x>
+      <y>120</y>
+      <width>118</width>
+      <height>28</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>Quitter</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QMenuBar" name="menuBar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>1054</width>
+     <height>25</height>
+    </rect>
+   </property>
+  </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>

dev/qtcreator/nogui-udp-receiver/main.cpp

@@ -0,0 +1,58 @@
+#include <iostream>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QTextStream>
+#include <QtCore/QDebug>
+#include <QtNetwork>
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication a(argc, argv);
+
+    bool go_on_like_this;
+    QUdpSocket listenSocket;
+    QByteArray datagram;
+    QHostAddress senderAddress;
+    quint16 senderPort;
+    QString msg;
+
+    if (listenSocket.bind(QHostAddress::Any, 8888) < 0) {
+        qDebug("Impossible de créer le socket en écoute");
+        go_on_like_this = false;
+    }
+    else
+        go_on_like_this = true;
+
+    while (go_on_like_this) {
+
+        if (listenSocket.waitForReadyRead(100)) {
+            if (listenSocket.hasPendingDatagrams()) {
+                datagram.resize(listenSocket.pendingDatagramSize());
+                listenSocket.readDatagram(datagram.data(), datagram.size(), &senderAddress, &senderPort);
+                msg = datagram.data();
+
+                qDebug() << "Depuis : " << senderAddress.toString() << ':' << senderPort;
+                qDebug() << "Message : " << msg;
+
+                msg = msg.toUpper();
+                datagram.clear();
+                datagram.append(msg);
+
+                if (listenSocket.writeDatagram(datagram, senderAddress, senderPort) < 0) {
+                    qDebug("Émission du message modifié impossible");
+                    listenSocket.close();
+                    exit(1);
+                }
+            }
+
+            if (msg  == "_EXIT_") {
+                listenSocket.close();
+                go_on_like_this = false;
+                exit(0);
+            }
+        }
+    }
+
+    listenSocket.close();
+
+    return a.exec();
+ }

dev/qtcreator/nogui-udp-receiver/nogui-udp-receiver.pro

@@ -0,0 +1,19 @@
+#-------------------------------------------------
+#
+# Project created by QtCreator 2012-02-26T17:43:37
+#
+#-------------------------------------------------
+
+QT       += core
+QT       += network
+
+QT       -= gui
+
+TARGET = nogui-udp-receiver
+CONFIG   += console
+CONFIG   -= app_bundle
+
+TEMPLATE = app
+
+
+SOURCES += main.cpp