5 files changed, 340 insertions, 0 deletions
diff --git a/examples/network/clientserver/client/client.cpp b/examples/network/clientserver/client/client.cpp
new file mode 100644
index 0000000..35cfb98
--- /dev/null
+++ b/examples/network/clientserver/client/client.cpp
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qsocket.h>
+#include <qapplication.h>
+#include <qvbox.h>
+#include <qhbox.h>
+#include <qtextview.h>
+#include <qlineedit.h>
+#include <qlabel.h>
+#include <qpushbutton.h>
+#include <qtextstream.h>
+
+
+class Client : public QVBox
+{
+    Q_OBJECT
+public:
+    Client( const QString &host, Q_UINT16 port )
+    {
+	// GUI layout
+	infoText = new QTextView( this );
+	QHBox *hb = new QHBox( this );
+	inputText = new QLineEdit( hb );
+	QPushButton *send = new QPushButton( tr("Send") , hb );
+	QPushButton *close = new QPushButton( tr("Close connection") , this );
+	QPushButton *quit = new QPushButton( tr("Quit") , this );
+
+	connect( send, SIGNAL(clicked()), SLOT(sendToServer()) );
+	connect( close, SIGNAL(clicked()), SLOT(closeConnection()) );
+	connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );
+
+	// create the socket and connect various of its signals
+	socket = new QSocket( this );
+	connect( socket, SIGNAL(connected()),
+		SLOT(socketConnected()) );
+	connect( socket, SIGNAL(connectionClosed()),
+		SLOT(socketConnectionClosed()) );
+	connect( socket, SIGNAL(readyRead()),
+		SLOT(socketReadyRead()) );
+	connect( socket, SIGNAL(error(int)),
+		SLOT(socketError(int)) );
+
+	// connect to the server
+	infoText->append( tr("Trying to connect to the server\n") );
+	socket->connectToHost( host, port );
+    }
+
+    ~Client()
+    {
+    }
+
+private slots:
+    void closeConnection()
+    {
+	socket->close();
+	if ( socket->state() == QSocket::Closing ) {
+	    // We have a delayed close.
+	    connect( socket, SIGNAL(delayedCloseFinished()),
+		    SLOT(socketClosed()) );
+	} else {
+	    // The socket is closed.
+	    socketClosed();
+	}
+    }
+
+    void sendToServer()
+    {
+	// write to the server
+	QTextStream os(socket);
+	os << inputText->text() << "\n";
+	inputText->setText( "" );
+    }
+
+    void socketReadyRead()
+    {
+	// read from the server
+	while ( socket->canReadLine() ) {
+	    infoText->append( socket->readLine() );
+	}
+    }
+
+    void socketConnected()
+    {
+	infoText->append( tr("Connected to server\n") );
+    }
+
+    void socketConnectionClosed()
+    {
+	infoText->append( tr("Connection closed by the server\n") );
+    }
+
+    void socketClosed()
+    {
+	infoText->append( tr("Connection closed\n") );
+    }
+
+    void socketError( int e )
+    {
+	infoText->append( tr("Error number %1 occurred\n").arg(e) );
+    }
+
+private:
+    QSocket *socket;
+    QTextView *infoText;
+    QLineEdit *inputText;
+};
+
+
+int main( int argc, char** argv )
+{
+    QApplication app( argc, argv );
+    Client client( argc<2 ? "localhost" : argv[1], 4242 );
+    app.setMainWidget( &client );
+    client.show();
+    return app.exec();
+}
+
+#include "client.moc"
diff --git a/examples/network/clientserver/client/client.pro b/examples/network/clientserver/client/client.pro
new file mode 100644
index 0000000..bc3b9e9
--- /dev/null
+++ b/examples/network/clientserver/client/client.pro
@@ -0,0 +1,9 @@
+TEMPLATE	= app
+TARGET		= client
+
+CONFIG		+= qt warn_on release
+
+REQUIRES        = network full-config
+
+HEADERS		=
+SOURCES		= client.cpp
diff --git a/examples/network/clientserver/clientserver.doc b/examples/network/clientserver/clientserver.doc
new file mode 100644
index 0000000..67b72a5
--- /dev/null
+++ b/examples/network/clientserver/clientserver.doc
@@ -0,0 +1,35 @@
+/*
+*/
+     
+/*! \page clientserver-example.html
+
+  \ingroup network-examples
+
+  \title A small client-server example
+ 
+  This example shows how two programs can communicate using sockets.
+
+  Two simple example programs are provided, a client program and a
+  server program. Both use the QSocket class, and the server also uses
+  QServerSocket class.
+  
+  The server listens on port number 4242 and accepts incoming connections.
+  It sends back every line it receives from the client, prepended with
+  the line number.
+
+  The client tries to connect to the server on the host specified on the
+  command line or to localhost if no command line arguments are
+  specified. You can send single lines to the server.
+
+  <hr>
+
+  Implementation server (server.cpp):
+ 
+  \include network/clientserver/server/server.cpp
+
+  <hr>
+
+  Implementation client (client.cpp):
+ 
+  \include network/clientserver/client/client.cpp
+*/
diff --git a/examples/network/clientserver/server/server.cpp b/examples/network/clientserver/server/server.cpp
new file mode 100644
index 0000000..440647c
--- /dev/null
+++ b/examples/network/clientserver/server/server.cpp
@@ -0,0 +1,162 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include <qsocket.h>
+#include <qserversocket.h>
+#include <qapplication.h>
+#include <qvbox.h>
+#include <qtextview.h>
+#include <qlabel.h>
+#include <qpushbutton.h>
+#include <qtextstream.h>
+
+#include <stdlib.h>
+
+
+/*
+  The ClientSocket class provides a socket that is connected with a client.
+  For every client that connects to the server, the server creates a new
+  instance of this class.
+*/
+class ClientSocket : public QSocket
+{
+    Q_OBJECT
+public:
+    ClientSocket( int sock, QObject *parent=0, const char *name=0 ) :
+	QSocket( parent, name )
+    {
+	line = 0;
+	connect( this, SIGNAL(readyRead()),
+		SLOT(readClient()) );
+	connect( this, SIGNAL(connectionClosed()),
+		SLOT(deleteLater()) );
+	setSocket( sock );
+    }
+
+    ~ClientSocket()
+    {
+    }
+
+signals:
+    void logText( const QString& );
+
+private slots:
+    void readClient()
+    {
+	QTextStream ts( this );
+	while ( canReadLine() ) {
+	    QString str = ts.readLine();
+	    emit logText( tr("Read: '%1'\n").arg(str) );
+
+	    ts << line << ": " << str << endl;
+	    emit logText( tr("Wrote: '%1: %2'\n").arg(line).arg(str) );
+
+	    line++;
+	}
+    }
+
+private:
+    int line;
+};
+
+
+/*
+  The SimpleServer class handles new connections to the server. For every
+  client that connects, it creates a new ClientSocket -- that instance is now
+  responsible for the communication with that client.
+*/
+class SimpleServer : public QServerSocket
+{
+    Q_OBJECT
+public:
+    SimpleServer( QObject* parent=0 ) :
+	QServerSocket( 4242, 1, parent )
+    {
+	if ( !ok() ) {
+	    qWarning("Failed to bind to port 4242");
+	    exit(1);
+	}
+    }
+
+    ~SimpleServer()
+    {
+    }
+
+    void newConnection( int socket )
+    {
+	ClientSocket *s = new ClientSocket( socket, this );
+	emit newConnect( s );
+    }
+
+signals:
+    void newConnect( ClientSocket* );
+};
+
+
+/*
+  The ServerInfo class provides a small GUI for the server. It also creates the
+  SimpleServer and as a result the server.
+*/
+class ServerInfo : public QVBox
+{
+    Q_OBJECT
+public:
+    ServerInfo()
+    {
+	SimpleServer *server = new SimpleServer( this );
+
+	QString itext = tr(
+		"This is a small server example.\n"
+		"Connect with the client now."
+		);
+	QLabel *lb = new QLabel( itext, this );
+	lb->setAlignment( AlignHCenter );
+	infoText = new QTextView( this );
+	QPushButton *quit = new QPushButton( tr("Quit") , this );
+
+	connect( server, SIGNAL(newConnect(ClientSocket*)),
+		SLOT(newConnect(ClientSocket*)) );
+	connect( quit, SIGNAL(clicked()), qApp,
+		SLOT(quit()) );
+    }
+
+    ~ServerInfo()
+    {
+    }
+
+private slots:
+    void newConnect( ClientSocket *s )
+    {
+	infoText->append( tr("New connection\n") );
+	connect( s, SIGNAL(logText(const QString&)),
+		infoText, SLOT(append(const QString&)) );
+	connect( s, SIGNAL(connectionClosed()),
+		SLOT(connectionClosed()) );
+    }
+
+    void connectionClosed()
+    {
+	infoText->append( tr("Client closed connection\n") );
+    }
+
+private:
+    QTextView *infoText;
+};
+
+
+int main( int argc, char** argv )
+{
+    QApplication app( argc, argv );
+    ServerInfo info;
+    app.setMainWidget( &info );
+    info.show();
+    return app.exec();
+}
+
+#include "server.moc"
diff --git a/examples/network/clientserver/server/server.pro b/examples/network/clientserver/server/server.pro
new file mode 100644
index 0000000..0a845b5
--- /dev/null
+++ b/examples/network/clientserver/server/server.pro
@@ -0,0 +1,9 @@
+TEMPLATE	= app
+TARGET		= server
+
+CONFIG		+= qt warn_on release
+
+REQUIRES        = network full-config
+
+HEADERS		=
+SOURCES		= server.cpp