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<title>A simple mail client</title>
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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 simple mail client</h1>
<p>
<p> This example shows how to use the <a href="qsocket.html">QSocket</a> class. The client can only be
used to send mails. The interesting part is the implementation of the
SMTP protocol.
<p> <hr>
<p> Header file (smtp.h):
<p> <pre>/****************************************************************************
** $Id: qt/smtp.h 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef SMTP_H
#define SMTP_H
#include <<a href="qobject-h.html">qobject.h</a>>
#include <<a href="qstring-h.html">qstring.h</a>>
class QSocket;
class QTextStream;
class QDns;
class Smtp : public <a href="qobject.html">QObject</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
Smtp( const <a href="qstring.html">QString</a> &from, const <a href="qstring.html">QString</a> &to,
const <a href="qstring.html">QString</a> &subject, const <a href="qstring.html">QString</a> &body );
~Smtp();
signals:
void status( const <a href="qstring.html">QString</a> & );
private slots:
void dnsLookupHelper();
void readyRead();
void connected();
private:
enum State {
Init,
Mail,
Rcpt,
Data,
Body,
Quit,
Close
};
<a href="qstring.html">QString</a> message;
<a href="qstring.html">QString</a> from;
<a href="qstring.html">QString</a> rcpt;
<a href="qsocket.html">QSocket</a> *socket;
<a href="qtextstream.html">QTextStream</a> * t;
int state;
<a href="qstring.html">QString</a> response;
<a href="qdns.html">QDns</a> * mxLookup;
};
#endif
</pre>
<p> <hr>
<p> Implementation (smtp.cpp):
<p> <pre>/****************************************************************************
** $Id: qt/smtp.cpp 3.0.2 edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS. 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 "smtp.h"
#include <<a href="qtextstream-h.html">qtextstream.h</a>>
#include <<a href="qsocket-h.html">qsocket.h</a>>
#include <<a href="qdns-h.html">qdns.h</a>>
#include <<a href="qtimer-h.html">qtimer.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <<a href="qmessagebox-h.html">qmessagebox.h</a>>
#include <<a href="qregexp-h.html">qregexp.h</a>>
<a name="f306"></a>Smtp::Smtp( const <a href="qstring.html">QString</a> &from, const <a href="qstring.html">QString</a> &to,
const <a href="qstring.html">QString</a> &subject,
const <a href="qstring.html">QString</a> &body )
{
socket = new <a href="qsocket.html">QSocket</a>( this );
<a name="x979"></a> <a href="qobject.html#connect">connect</a> ( socket, SIGNAL( <a href="qsocket.html#readyRead">readyRead</a>() ),
this, SLOT( readyRead() ) );
<a name="x977"></a> <a href="qobject.html#connect">connect</a> ( socket, SIGNAL( <a href="qsocket.html#connected">connected</a>() ),
this, SLOT( connected() ) );
<a name="x982"></a><a name="x980"></a> mxLookup = new <a href="qdns.html">QDns</a>( to.<a href="qstring.html#mid">mid</a>( to.<a href="qstring.html#find">find</a>( '@' )+1 ), QDns::Mx );
<a name="x972"></a> <a href="qobject.html#connect">connect</a>( mxLookup, SIGNAL(<a href="qdns.html#resultsReady">resultsReady</a>()),
this, SLOT(dnsLookupHelper()) );
<a name="x981"></a> message = QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "From: " ) + from +
QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\nTo: " ) + to +
QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\nSubject: " ) + subject +
QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\n\n" ) + body + "\n";
message.replace( QRegExp( QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\n" ) ),
QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\r\n" ) );
message.replace( QRegExp( QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\r\n.\r\n" ) ),
QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\r\n..\r\n" ) );
this->from = from;
rcpt = to;
state = Init;
}
Smtp::~Smtp()
{
delete t;
delete socket;
}
void <a name="f307"></a>Smtp::dnsLookupHelper()
{
<a name="x971"></a> <a href="qvaluelist.html">QValueList</a><QDns::MailServer> s = mxLookup-><a href="qdns.html#mailServers">mailServers</a>();
<a name="x985"></a><a name="x970"></a> if ( s.<a href="qvaluelist.html#isEmpty">isEmpty</a>() && mxLookup-><a href="qdns.html#isWorking">isWorking</a>() )
return;
<a name="x984"></a> emit status( <a href="qobject.html#tr">tr</a>( "Connecting to %1" ).arg( s.<a href="qvaluelist.html#first">first</a>().name ) );
<a name="x976"></a> socket-><a href="qsocket.html#connectToHost">connectToHost</a>( s.<a href="qvaluelist.html#first">first</a>().name, 25 );
t = new <a href="qtextstream.html">QTextStream</a>( socket );
}
void <a name="f308"></a>Smtp::connected()
{
<a name="x978"></a> emit status( <a href="qobject.html#tr">tr</a>( "Connected to %1" ).arg( socket-><a href="qsocket.html#peerName">peerName</a>() ) );
}
void <a name="f309"></a>Smtp::readyRead()
{
// SMTP is line-oriented
<a name="x975"></a> if ( !socket-><a href="qsocket.html#canReadLine">canReadLine</a>() )
return;
<a href="qstring.html">QString</a> responseLine;
do {
<a name="x973"></a> responseLine = socket-><a href="qsocket.html#readLine">readLine</a>();
response += responseLine;
} while( socket-><a href="qsocket.html#canReadLine">canReadLine</a>() && responseLine[3] != ' ' );
<a name="x983"></a> responseLine.<a href="qstring.html#truncate">truncate</a>( 3 );
if ( state == Init && responseLine[0] == '2' ) {
// banner was okay, let's go on
*t << "HELO there\r\n";
state = Mail;
} else if ( state == Mail && responseLine[0] == '2' ) {
// HELO response was okay (well, it has to be)
*t << "MAIL FROM: <" << from << ">\r\n";
state = Rcpt;
} else if ( state == Rcpt && responseLine[0] == '2' ) {
*t << "RCPT TO: <" << rcpt << ">\r\n";
state = Data;
} else if ( state == Data && responseLine[0] == '2' ) {
*t << "DATA\r\n";
state = Body;
} else if ( state == Body && responseLine[0] == '3' ) {
*t << message << ".\r\n";
state = Quit;
} else if ( state == Quit && responseLine[0] == '2' ) {
*t << "QUIT\r\n";
// here, we just close.
state = Close;
emit status( <a href="qobject.html#tr">tr</a>( "Message sent" ) );
} else if ( state == Close ) {
delete this;
} else {
// something broke.
<a name="x974"></a><a name="x969"></a> QMessageBox::<a href="qmessagebox.html#warning">warning</a>( qApp-><a href="qapplication.html#activeWindow">activeWindow</a>(),
<a href="qobject.html#tr">tr</a>( "Qt Mail Example" ),
<a href="qobject.html#tr">tr</a>( "Unexpected reply from SMTP server:\n\n" ) +
response );
state = Close;
}
response = "";
}
</pre>
<p>See also <a href="network-examples.html">Network Examples</a>.
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