You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
353 lines
13 KiB
353 lines
13 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
|
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/network/clientserver/clientserver.doc:5 -->
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
|
|
<title>A small client-server example</title>
|
|
<style type="text/css"><!--
|
|
fn { margin-left: 1cm; text-indent: -1cm; }
|
|
a:link { color: #004faf; text-decoration: none }
|
|
a:visited { color: #672967; text-decoration: none }
|
|
body { background: #ffffff; color: black; }
|
|
--></style>
|
|
</head>
|
|
<body>
|
|
|
|
<table border="0" cellpadding="0" cellspacing="0" width="100%">
|
|
<tr bgcolor="#E5E5E5">
|
|
<td valign=center>
|
|
<a href="index.html">
|
|
<font color="#004faf">Home</font></a>
|
|
| <a href="classes.html">
|
|
<font color="#004faf">All Classes</font></a>
|
|
| <a href="mainclasses.html">
|
|
<font color="#004faf">Main Classes</font></a>
|
|
| <a href="annotated.html">
|
|
<font color="#004faf">Annotated</font></a>
|
|
| <a href="groups.html">
|
|
<font color="#004faf">Grouped Classes</font></a>
|
|
| <a href="functions.html">
|
|
<font color="#004faf">Functions</font></a>
|
|
</td>
|
|
<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>
|
|
|
|
|
|
<p>
|
|
<p> This example shows how two programs can communicate using sockets.
|
|
<p> Two simple example programs are provided, a client program and a
|
|
server program. Both use the <a href="ntqsocket.html">TQSocket</a> class, and the server also uses
|
|
<a href="ntqserversocket.html">TQServerSocket</a> class.
|
|
<p> 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.
|
|
<p> 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.
|
|
<p> <hr>
|
|
<p> Implementation server (server.cpp):
|
|
<p> <pre>/****************************************************************************
|
|
** $Id: qt/server.cpp 3.3.8 edited Jan 11 14:37 $
|
|
**
|
|
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of an example program for TQt. This example
|
|
** program may be used, distributed and modified without limitation.
|
|
**
|
|
*****************************************************************************/
|
|
|
|
#include <<a href="qsocket-h.html">ntqsocket.h</a>>
|
|
#include <<a href="qserversocket-h.html">ntqserversocket.h</a>>
|
|
#include <<a href="qapplication-h.html">ntqapplication.h</a>>
|
|
#include <<a href="qvbox-h.html">ntqvbox.h</a>>
|
|
#include <<a href="qtextview-h.html">ntqtextview.h</a>>
|
|
#include <<a href="qlabel-h.html">ntqlabel.h</a>>
|
|
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
|
|
#include <<a href="qtextstream-h.html">ntqtextstream.h</a>>
|
|
|
|
#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 <a href="ntqsocket.html">TQSocket</a>
|
|
{
|
|
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
|
|
public:
|
|
ClientSocket( int sock, TQObject *parent=0, const char *name=0 ) :
|
|
<a href="ntqsocket.html">TQSocket</a>( parent, name )
|
|
{
|
|
line = 0;
|
|
connect( this, TQ_SIGNAL(readyRead()),
|
|
TQ_SLOT(readClient()) );
|
|
connect( this, TQ_SIGNAL(connectionClosed()),
|
|
TQ_SLOT(deleteLater()) );
|
|
setSocket( sock );
|
|
}
|
|
|
|
~ClientSocket()
|
|
{
|
|
}
|
|
|
|
signals:
|
|
void logText( const <a href="ntqstring.html">TQString</a>& );
|
|
|
|
private slots:
|
|
void readClient()
|
|
{
|
|
<a href="ntqtextstream.html">TQTextStream</a> ts( this );
|
|
while ( canReadLine() ) {
|
|
<a name="x787"></a> <a href="ntqstring.html">TQString</a> str = ts.<a href="ntqtextstream.html#readLine">readLine</a>();
|
|
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 <a href="ntqserversocket.html">TQServerSocket</a>
|
|
{
|
|
TQ_OBJECT
|
|
public:
|
|
SimpleServer( <a href="ntqobject.html">TQObject</a>* parent=0 ) :
|
|
<a href="ntqserversocket.html">TQServerSocket</a>( 4242, 1, parent )
|
|
{
|
|
if ( !ok() ) {
|
|
<a href="ntqapplication.html#qWarning">tqWarning</a>("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 <a href="ntqvbox.html">TQVBox</a>
|
|
{
|
|
TQ_OBJECT
|
|
public:
|
|
ServerInfo()
|
|
{
|
|
SimpleServer *server = new SimpleServer( this );
|
|
|
|
<a href="ntqstring.html">TQString</a> itext = tr(
|
|
"This is a small server example.\n"
|
|
"Connect with the client now."
|
|
);
|
|
<a href="ntqlabel.html">TQLabel</a> *lb = new <a href="ntqlabel.html">TQLabel</a>( itext, this );
|
|
<a name="x784"></a> lb-><a href="ntqlabel.html#setAlignment">setAlignment</a>( AlignHCenter );
|
|
infoText = new <a href="ntqtextview.html">TQTextView</a>( this );
|
|
<a href="ntqpushbutton.html">TQPushButton</a> *quit = new <a href="ntqpushbutton.html">TQPushButton</a>( tr("Quit") , this );
|
|
|
|
connect( server, TQ_SIGNAL(newConnect(ClientSocket*)),
|
|
TQ_SLOT(newConnect(ClientSocket*)) );
|
|
connect( quit, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), tqApp,
|
|
TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
|
|
}
|
|
|
|
~ServerInfo()
|
|
{
|
|
}
|
|
|
|
private slots:
|
|
void newConnect( ClientSocket *s )
|
|
{
|
|
<a name="x786"></a> infoText-><a href="ntqtextedit.html#append">append</a>( tr("New connection\n") );
|
|
connect( s, TQ_SIGNAL(logText(const <a href="ntqstring.html">TQString</a>&)),
|
|
infoText, TQ_SLOT(<a href="ntqtextedit.html#append">append</a>(const <a href="ntqstring.html">TQString</a>&)) );
|
|
<a name="x785"></a> connect( s, TQ_SIGNAL(<a href="ntqsocket.html#connectionClosed">connectionClosed</a>()),
|
|
TQ_SLOT(connectionClosed()) );
|
|
}
|
|
|
|
void connectionClosed()
|
|
{
|
|
infoText-><a href="ntqtextedit.html#append">append</a>( tr("Client closed connection\n") );
|
|
}
|
|
|
|
private:
|
|
<a href="ntqtextview.html">TQTextView</a> *infoText;
|
|
};
|
|
|
|
|
|
int main( int argc, char** argv )
|
|
{
|
|
<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
|
|
ServerInfo info;
|
|
app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &info );
|
|
info.<a href="ntqwidget.html#show">show</a>();
|
|
return app.<a href="ntqapplication.html#exec">exec</a>();
|
|
}
|
|
|
|
#include "server.moc"
|
|
</pre>
|
|
|
|
<p> <hr>
|
|
<p> Implementation client (client.cpp):
|
|
<p> <pre>/****************************************************************************
|
|
** $Id: qt/client.cpp 3.3.8 edited Jan 11 14:37 $
|
|
**
|
|
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
|
|
**
|
|
** This file is part of an example program for TQt. This example
|
|
** program may be used, distributed and modified without limitation.
|
|
**
|
|
*****************************************************************************/
|
|
|
|
#include <<a href="qsocket-h.html">ntqsocket.h</a>>
|
|
#include <<a href="qapplication-h.html">ntqapplication.h</a>>
|
|
#include <<a href="qvbox-h.html">ntqvbox.h</a>>
|
|
#include <<a href="qhbox-h.html">ntqhbox.h</a>>
|
|
#include <<a href="qtextview-h.html">ntqtextview.h</a>>
|
|
#include <<a href="qlineedit-h.html">ntqlineedit.h</a>>
|
|
#include <<a href="qlabel-h.html">ntqlabel.h</a>>
|
|
#include <<a href="qpushbutton-h.html">ntqpushbutton.h</a>>
|
|
#include <<a href="qtextstream-h.html">ntqtextstream.h</a>>
|
|
|
|
|
|
class Client : public <a href="ntqvbox.html">TQVBox</a>
|
|
{
|
|
TQ_OBJECT
|
|
public:
|
|
Client( const <a href="ntqstring.html">TQString</a> &host, TQ_UINT16 port )
|
|
{
|
|
// GUI layout
|
|
infoText = new <a href="ntqtextview.html">TQTextView</a>( this );
|
|
<a href="ntqhbox.html">TQHBox</a> *hb = new <a href="ntqhbox.html">TQHBox</a>( this );
|
|
inputText = new <a href="ntqlineedit.html">TQLineEdit</a>( hb );
|
|
<a href="ntqpushbutton.html">TQPushButton</a> *send = new <a href="ntqpushbutton.html">TQPushButton</a>( tr("Send") , hb );
|
|
<a href="ntqpushbutton.html">TQPushButton</a> *close = new <a href="ntqpushbutton.html">TQPushButton</a>( tr("Close connection") , this );
|
|
<a href="ntqpushbutton.html">TQPushButton</a> *quit = new <a href="ntqpushbutton.html">TQPushButton</a>( tr("Quit") , this );
|
|
|
|
<a name="x792"></a> connect( send, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), TQ_SLOT(sendToServer()) );
|
|
connect( close, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), TQ_SLOT(closeConnection()) );
|
|
connect( quit, TQ_SIGNAL(<a href="ntqbutton.html#clicked">clicked</a>()), tqApp, TQ_SLOT(<a href="ntqapplication.html#quit">quit</a>()) );
|
|
|
|
// create the socket and connect various of its signals
|
|
socket = new <a href="ntqsocket.html">TQSocket</a>( this );
|
|
<a name="x798"></a> connect( socket, TQ_SIGNAL(<a href="ntqsocket.html#connected">connected</a>()),
|
|
TQ_SLOT(socketConnected()) );
|
|
<a name="x799"></a> connect( socket, TQ_SIGNAL(<a href="ntqsocket.html#connectionClosed">connectionClosed</a>()),
|
|
TQ_SLOT(socketConnectionClosed()) );
|
|
<a name="x803"></a> connect( socket, TQ_SIGNAL(<a href="ntqsocket.html#readyRead">readyRead</a>()),
|
|
TQ_SLOT(socketReadyRead()) );
|
|
<a name="x801"></a> connect( socket, TQ_SIGNAL(<a href="ntqsocket.html#error">error</a>(int)),
|
|
TQ_SLOT(socketError(int)) );
|
|
|
|
// connect to the server
|
|
<a name="x805"></a> infoText-><a href="ntqtextedit.html#append">append</a>( tr("Trying to connect to the server\n") );
|
|
<a name="x797"></a> socket-><a href="ntqsocket.html#connectToHost">connectToHost</a>( host, port );
|
|
}
|
|
|
|
~Client()
|
|
{
|
|
}
|
|
|
|
private slots:
|
|
void closeConnection()
|
|
{
|
|
<a name="x796"></a> socket-><a href="ntqsocket.html#close">close</a>();
|
|
<a name="x804"></a> if ( socket-><a href="ntqsocket.html#state">state</a>() == TQSocket::Closing ) {
|
|
// We have a delayed close.
|
|
<a name="x800"></a> connect( socket, TQ_SIGNAL(<a href="ntqsocket.html#delayedCloseFinished">delayedCloseFinished</a>()),
|
|
TQ_SLOT(socketClosed()) );
|
|
} else {
|
|
// The socket is closed.
|
|
socketClosed();
|
|
}
|
|
}
|
|
|
|
void sendToServer()
|
|
{
|
|
// write to the server
|
|
<a href="ntqtextstream.html">TQTextStream</a> os(socket);
|
|
<a name="x794"></a> os << inputText-><a href="ntqlineedit.html#text">text</a>() << "\n";
|
|
<a name="x793"></a> inputText-><a href="ntqlineedit.html#setText">setText</a>( "" );
|
|
}
|
|
|
|
void socketReadyRead()
|
|
{
|
|
// read from the server
|
|
<a name="x795"></a> while ( socket-><a href="ntqsocket.html#canReadLine">canReadLine</a>() ) {
|
|
<a name="x802"></a> infoText-><a href="ntqtextedit.html#append">append</a>( socket-><a href="ntqsocket.html#readLine">readLine</a>() );
|
|
}
|
|
}
|
|
|
|
void socketConnected()
|
|
{
|
|
infoText-><a href="ntqtextedit.html#append">append</a>( tr("Connected to server\n") );
|
|
}
|
|
|
|
void socketConnectionClosed()
|
|
{
|
|
infoText-><a href="ntqtextedit.html#append">append</a>( tr("Connection closed by the server\n") );
|
|
}
|
|
|
|
void socketClosed()
|
|
{
|
|
infoText-><a href="ntqtextedit.html#append">append</a>( tr("Connection closed\n") );
|
|
}
|
|
|
|
void socketError( int e )
|
|
{
|
|
infoText-><a href="ntqtextedit.html#append">append</a>( tr("Error number %1 occurred\n").arg(e) );
|
|
}
|
|
|
|
private:
|
|
<a href="ntqsocket.html">TQSocket</a> *socket;
|
|
<a href="ntqtextview.html">TQTextView</a> *infoText;
|
|
<a href="ntqlineedit.html">TQLineEdit</a> *inputText;
|
|
};
|
|
|
|
|
|
int main( int argc, char** argv )
|
|
{
|
|
<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
|
|
Client client( argc<2 ? "localhost" : argv[1], 4242 );
|
|
app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &client );
|
|
client.<a href="ntqwidget.html#show">show</a>();
|
|
return app.<a href="ntqapplication.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>TQt 3.3.8</div>
|
|
</table></div></address></body>
|
|
</html>
|