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353 lines
13 KiB
353 lines
13 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/network/clientserver/clientserver.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>A small client-server example</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A small client-server example</h1>
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<p>
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<p> This example shows how two programs can communicate using sockets.
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<p> Two simple example programs are provided, a client program and a
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server program. Both use the <a href="qsocket.html">QSocket</a> class, and the server also uses
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<a href="qserversocket.html">QServerSocket</a> class.
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<p> The server listens on port number 4242 and accepts incoming connections.
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It sends back every line it receives from the client, prepended with
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the line number.
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<p> The client tries to connect to the server on the host specified on the
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command line or to localhost if no command line arguments are
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specified. You can send single lines to the server.
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<p> <hr>
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<p> Implementation server (server.cpp):
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<p> <pre>/****************************************************************************
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** $Id: qt/server.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qsocket-h.html">qsocket.h</a>>
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#include <<a href="qserversocket-h.html">qserversocket.h</a>>
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qvbox-h.html">qvbox.h</a>>
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#include <<a href="qtextview-h.html">qtextview.h</a>>
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#include <<a href="qlabel-h.html">qlabel.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qtextstream-h.html">qtextstream.h</a>>
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#include <stdlib.h>
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/*
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The ClientSocket class provides a socket that is connected with a client.
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For every client that connects to the server, the server creates a new
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instance of this class.
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*/
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class ClientSocket : public <a href="qsocket.html">QSocket</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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ClientSocket( int sock, QObject *parent=0, const char *name=0 ) :
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<a href="qsocket.html">QSocket</a>( parent, name )
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{
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line = 0;
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connect( this, SIGNAL(readyRead()),
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SLOT(readClient()) );
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connect( this, SIGNAL(connectionClosed()),
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SLOT(deleteLater()) );
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setSocket( sock );
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}
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~ClientSocket()
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{
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}
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signals:
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void logText( const <a href="qstring.html">QString</a>& );
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private slots:
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void readClient()
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{
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<a href="qtextstream.html">QTextStream</a> ts( this );
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while ( canReadLine() ) {
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<a name="x787"></a> <a href="qstring.html">QString</a> str = ts.<a href="qtextstream.html#readLine">readLine</a>();
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emit logText( tr("Read: '%1'\n").arg(str) );
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ts << line << ": " << str << endl;
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emit logText( tr("Wrote: '%1: %2'\n").arg(line).arg(str) );
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line++;
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}
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}
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private:
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int line;
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};
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/*
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The SimpleServer class handles new connections to the server. For every
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client that connects, it creates a new ClientSocket -- that instance is now
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responsible for the communication with that client.
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*/
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class SimpleServer : public <a href="qserversocket.html">QServerSocket</a>
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{
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Q_OBJECT
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public:
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SimpleServer( <a href="qobject.html">QObject</a>* parent=0 ) :
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<a href="qserversocket.html">QServerSocket</a>( 4242, 1, parent )
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{
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if ( !ok() ) {
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<a href="qapplication.html#qWarning">qWarning</a>("Failed to bind to port 4242");
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exit(1);
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}
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}
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~SimpleServer()
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{
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}
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void newConnection( int socket )
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{
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ClientSocket *s = new ClientSocket( socket, this );
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emit newConnect( s );
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}
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signals:
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void newConnect( ClientSocket* );
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};
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/*
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The ServerInfo class provides a small GUI for the server. It also creates the
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SimpleServer and as a result the server.
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*/
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class ServerInfo : public <a href="qvbox.html">QVBox</a>
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{
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Q_OBJECT
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public:
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ServerInfo()
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{
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SimpleServer *server = new SimpleServer( this );
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<a href="qstring.html">QString</a> itext = tr(
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"This is a small server example.\n"
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"Connect with the client now."
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);
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<a href="qlabel.html">QLabel</a> *lb = new <a href="qlabel.html">QLabel</a>( itext, this );
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<a name="x784"></a> lb-><a href="qlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
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infoText = new <a href="qtextview.html">QTextView</a>( this );
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<a href="qpushbutton.html">QPushButton</a> *quit = new <a href="qpushbutton.html">QPushButton</a>( tr("Quit") , this );
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connect( server, SIGNAL(newConnect(ClientSocket*)),
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SLOT(newConnect(ClientSocket*)) );
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connect( quit, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), qApp,
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SLOT(<a href="qapplication.html#quit">quit</a>()) );
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}
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~ServerInfo()
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{
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}
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private slots:
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void newConnect( ClientSocket *s )
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{
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<a name="x786"></a> infoText-><a href="qtextedit.html#append">append</a>( tr("New connection\n") );
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connect( s, SIGNAL(logText(const <a href="qstring.html">QString</a>&)),
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infoText, SLOT(<a href="qtextedit.html#append">append</a>(const <a href="qstring.html">QString</a>&)) );
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<a name="x785"></a> connect( s, SIGNAL(<a href="qsocket.html#connectionClosed">connectionClosed</a>()),
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SLOT(connectionClosed()) );
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}
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void connectionClosed()
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{
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infoText-><a href="qtextedit.html#append">append</a>( tr("Client closed connection\n") );
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}
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private:
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<a href="qtextview.html">QTextView</a> *infoText;
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};
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int main( int argc, char** argv )
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{
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<a href="qapplication.html">QApplication</a> app( argc, argv );
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ServerInfo info;
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app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &info );
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info.<a href="qwidget.html#show">show</a>();
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return app.<a href="qapplication.html#exec">exec</a>();
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}
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#include "server.moc"
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</pre>
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<p> <hr>
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<p> Implementation client (client.cpp):
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<p> <pre>/****************************************************************************
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** $Id: qt/client.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qsocket-h.html">qsocket.h</a>>
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <<a href="qvbox-h.html">qvbox.h</a>>
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#include <<a href="qhbox-h.html">qhbox.h</a>>
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#include <<a href="qtextview-h.html">qtextview.h</a>>
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#include <<a href="qlineedit-h.html">qlineedit.h</a>>
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#include <<a href="qlabel-h.html">qlabel.h</a>>
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#include <<a href="qpushbutton-h.html">qpushbutton.h</a>>
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#include <<a href="qtextstream-h.html">qtextstream.h</a>>
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class Client : public <a href="qvbox.html">QVBox</a>
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{
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Q_OBJECT
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public:
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Client( const <a href="qstring.html">QString</a> &host, Q_UINT16 port )
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{
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// GUI layout
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infoText = new <a href="qtextview.html">QTextView</a>( this );
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<a href="qhbox.html">QHBox</a> *hb = new <a href="qhbox.html">QHBox</a>( this );
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inputText = new <a href="qlineedit.html">QLineEdit</a>( hb );
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<a href="qpushbutton.html">QPushButton</a> *send = new <a href="qpushbutton.html">QPushButton</a>( tr("Send") , hb );
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<a href="qpushbutton.html">QPushButton</a> *close = new <a href="qpushbutton.html">QPushButton</a>( tr("Close connection") , this );
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<a href="qpushbutton.html">QPushButton</a> *quit = new <a href="qpushbutton.html">QPushButton</a>( tr("Quit") , this );
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<a name="x792"></a> connect( send, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), SLOT(sendToServer()) );
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connect( close, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), SLOT(closeConnection()) );
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connect( quit, SIGNAL(<a href="qbutton.html#clicked">clicked</a>()), qApp, SLOT(<a href="qapplication.html#quit">quit</a>()) );
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// create the socket and connect various of its signals
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socket = new <a href="qsocket.html">QSocket</a>( this );
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<a name="x798"></a> connect( socket, SIGNAL(<a href="qsocket.html#connected">connected</a>()),
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SLOT(socketConnected()) );
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<a name="x799"></a> connect( socket, SIGNAL(<a href="qsocket.html#connectionClosed">connectionClosed</a>()),
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SLOT(socketConnectionClosed()) );
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<a name="x803"></a> connect( socket, SIGNAL(<a href="qsocket.html#readyRead">readyRead</a>()),
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SLOT(socketReadyRead()) );
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<a name="x801"></a> connect( socket, SIGNAL(<a href="qsocket.html#error">error</a>(int)),
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SLOT(socketError(int)) );
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// connect to the server
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<a name="x805"></a> infoText-><a href="qtextedit.html#append">append</a>( tr("Trying to connect to the server\n") );
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<a name="x797"></a> socket-><a href="qsocket.html#connectToHost">connectToHost</a>( host, port );
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}
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~Client()
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{
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}
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private slots:
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void closeConnection()
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{
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<a name="x796"></a> socket-><a href="qsocket.html#close">close</a>();
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<a name="x804"></a> if ( socket-><a href="qsocket.html#state">state</a>() == QSocket::Closing ) {
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// We have a delayed close.
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<a name="x800"></a> connect( socket, SIGNAL(<a href="qsocket.html#delayedCloseFinished">delayedCloseFinished</a>()),
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SLOT(socketClosed()) );
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} else {
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// The socket is closed.
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socketClosed();
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}
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}
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void sendToServer()
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{
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// write to the server
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<a href="qtextstream.html">QTextStream</a> os(socket);
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<a name="x794"></a> os << inputText-><a href="qlineedit.html#text">text</a>() << "\n";
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<a name="x793"></a> inputText-><a href="qlineedit.html#setText">setText</a>( "" );
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}
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void socketReadyRead()
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{
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// read from the server
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<a name="x795"></a> while ( socket-><a href="qsocket.html#canReadLine">canReadLine</a>() ) {
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<a name="x802"></a> infoText-><a href="qtextedit.html#append">append</a>( socket-><a href="qsocket.html#readLine">readLine</a>() );
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}
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}
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void socketConnected()
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{
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infoText-><a href="qtextedit.html#append">append</a>( tr("Connected to server\n") );
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}
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void socketConnectionClosed()
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{
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infoText-><a href="qtextedit.html#append">append</a>( tr("Connection closed by the server\n") );
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}
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void socketClosed()
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{
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infoText-><a href="qtextedit.html#append">append</a>( tr("Connection closed\n") );
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}
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void socketError( int e )
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{
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infoText-><a href="qtextedit.html#append">append</a>( tr("Error number %1 occurred\n").arg(e) );
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}
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private:
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<a href="qsocket.html">QSocket</a> *socket;
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<a href="qtextview.html">QTextView</a> *infoText;
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<a href="qlineedit.html">QLineEdit</a> *inputText;
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};
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int main( int argc, char** argv )
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||
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{
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<a href="qapplication.html">QApplication</a> app( argc, argv );
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||
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Client client( argc<2 ? "localhost" : argv[1], 4242 );
|
||
|
|
app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &client );
|
||
|
|
client.<a href="qwidget.html#show">show</a>();
|
||
|
|
return app.<a href="qapplication.html#exec">exec</a>();
|
||
|
|
}
|
||
|
|
|
||
|
|
#include "client.moc"
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p>See also <a href="network-examples.html">Network Examples</a>.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>Qt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|