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<!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/mail/mail.doc:5 -->
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<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="ntqsocket.html">TQSocket</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   3.3.8   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.
**
*****************************************************************************/

#ifndef SMTP_H
#define SMTP_H

#include &lt;<a href="qobject-h.html">ntqobject.h</a>&gt;
#include &lt;<a href="qstring-h.html">ntqstring.h</a>&gt;

class TQSocket;
class TQTextStream;
class TQDns;

class Smtp : public <a href="ntqobject.html">TQObject</a>
{
    <a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>

public:
    Smtp( const <a href="ntqstring.html">TQString</a> &amp;from, const <a href="ntqstring.html">TQString</a> &amp;to,
          const <a href="ntqstring.html">TQString</a> &amp;subject, const <a href="ntqstring.html">TQString</a> &amp;body );
    ~Smtp();

signals:
    void status( const <a href="ntqstring.html">TQString</a> &amp; );

private slots:
    void dnsLookupHelper();
    void readyRead();
    void connected();

private:
    enum State {
        Init,
        Mail,
        Rcpt,
        Data,
        Body,
        Quit,
        Close
    };

    <a href="ntqstring.html">TQString</a> message;
    <a href="ntqstring.html">TQString</a> from;
    <a href="ntqstring.html">TQString</a> rcpt;
    <a href="ntqsocket.html">TQSocket</a> *socket;
    <a href="ntqtextstream.html">TQTextStream</a> * t;
    int state;
    <a href="ntqstring.html">TQString</a> response;
    <a href="ntqdns.html">TQDns</a> * mxLookup;
};

#endif
</pre>

<p> <hr>
<p> Implementation (smtp.cpp):
<p> <pre>/****************************************************************************
** $Id: qt/smtp.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 "smtp.h"

#include &lt;<a href="qtextstream-h.html">ntqtextstream.h</a>&gt;
#include &lt;<a href="qsocket-h.html">ntqsocket.h</a>&gt;
#include &lt;<a href="qdns-h.html">ntqdns.h</a>&gt;
#include &lt;<a href="qtimer-h.html">ntqtimer.h</a>&gt;
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">ntqmessagebox.h</a>&gt;
#include &lt;<a href="qregexp-h.html">ntqregexp.h</a>&gt;


<a name="f297"></a>Smtp::Smtp( const <a href="ntqstring.html">TQString</a> &amp;from, const <a href="ntqstring.html">TQString</a> &amp;to,
            const <a href="ntqstring.html">TQString</a> &amp;subject,
            const <a href="ntqstring.html">TQString</a> &amp;body )
{
    socket = new <a href="ntqsocket.html">TQSocket</a>( this );
<a name="x714"></a>    <a href="ntqobject.html#connect">connect</a> ( socket, SIGNAL( <a href="ntqsocket.html#readyRead">readyRead</a>() ),
              this, SLOT( readyRead() ) );
<a name="x711"></a>    <a href="ntqobject.html#connect">connect</a> ( socket, SIGNAL( <a href="ntqsocket.html#connected">connected</a>() ),
              this, SLOT( connected() ) );

<a name="x717"></a><a name="x715"></a>    mxLookup = new <a href="ntqdns.html">TQDns</a>( to.<a href="ntqstring.html#mid">mid</a>( to.<a href="ntqstring.html#find">find</a>( '@' )+1 ), TQDns::Mx );
<a name="x707"></a>    <a href="ntqobject.html#connect">connect</a>( mxLookup, SIGNAL(<a href="ntqdns.html#resultsReady">resultsReady</a>()),
             this, SLOT(dnsLookupHelper()) );

<a name="x716"></a>    message = TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "From: " ) + from +
              TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\nTo: " ) + to +
              TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\nSubject: " ) + subject +
              TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\n\n" ) + body + "\n";
    message.replace( TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\n" ),
                     TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\r\n" ) );
    message.replace( TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\r\n.\r\n" ),
                     TQString::<a href="ntqstring.html#fromLatin1">fromLatin1</a>( "\r\n..\r\n" ) );

    this-&gt;from = from;
    rcpt = to;

    state = Init;
}


Smtp::~Smtp()
{
    delete t;
    delete socket;
}


void <a name="f298"></a>Smtp::dnsLookupHelper()
{
<a name="x706"></a>    <a href="ntqvaluelist.html">TQValueList</a>&lt;TQDns::MailServer&gt; s = mxLookup-&gt;<a href="ntqdns.html#mailServers">mailServers</a>();
<a name="x720"></a>    if ( s.<a href="ntqvaluelist.html#isEmpty">isEmpty</a>() ) {
<a name="x705"></a>        if ( !mxLookup-&gt;<a href="ntqdns.html#isWorking">isWorking</a>() )
            emit status( <a href="ntqobject.html#tr">tr</a>( "Error in MX record lookup" ) );
        return;
    }

<a name="x719"></a>    emit status( <a href="ntqobject.html#tr">tr</a>( "Connecting to %1" ).arg( s.<a href="ntqvaluelist.html#first">first</a>().name ) );

<a name="x710"></a>    socket-&gt;<a href="ntqsocket.html#connectToHost">connectToHost</a>( s.<a href="ntqvaluelist.html#first">first</a>().name, 25 );
    t = new <a href="ntqtextstream.html">TQTextStream</a>( socket );
}


void <a name="f299"></a>Smtp::connected()
{
<a name="x712"></a>    emit status( <a href="ntqobject.html#tr">tr</a>( "Connected to %1" ).arg( socket-&gt;<a href="ntqsocket.html#peerName">peerName</a>() ) );
}

void <a name="f300"></a>Smtp::readyRead()
{
    // SMTP is line-oriented
<a name="x709"></a>    if ( !socket-&gt;<a href="ntqsocket.html#canReadLine">canReadLine</a>() )
        return;

    <a href="ntqstring.html">TQString</a> responseLine;
    do {
<a name="x713"></a>        responseLine = socket-&gt;<a href="ntqsocket.html#readLine">readLine</a>();
        response += responseLine;
    } while( socket-&gt;<a href="ntqsocket.html#canReadLine">canReadLine</a>() &amp;&amp; responseLine[3] != ' ' );
<a name="x718"></a>    responseLine.<a href="ntqstring.html#truncate">truncate</a>( 3 );

    if ( state == Init &amp;&amp; responseLine[0] == '2' ) {
        // banner was okay, let's go on
        *t &lt;&lt; "HELO there\r\n";
        state = Mail;
    } else if ( state == Mail &amp;&amp; responseLine[0] == '2' ) {
        // HELO response was okay (well, it has to be)
        *t &lt;&lt; "MAIL FROM: &lt;" &lt;&lt; from &lt;&lt; "&gt;\r\n";
        state = Rcpt;
    } else if ( state == Rcpt &amp;&amp; responseLine[0] == '2' ) {
        *t &lt;&lt; "RCPT TO: &lt;" &lt;&lt; rcpt &lt;&lt; "&gt;\r\n";
        state = Data;
    } else if ( state == Data &amp;&amp; responseLine[0] == '2' ) {
        *t &lt;&lt; "DATA\r\n";
        state = Body;
    } else if ( state == Body &amp;&amp; responseLine[0] == '3' ) {
        *t &lt;&lt; message &lt;&lt; ".\r\n";
        state = Quit;
    } else if ( state == Quit &amp;&amp; responseLine[0] == '2' ) {
        *t &lt;&lt; "TQUIT\r\n";
        // here, we just close.
        state = Close;
        emit status( <a href="ntqobject.html#tr">tr</a>( "Message sent" ) );
    } else if ( state == Close ) {
        <a href="ntqobject.html#deleteLater">deleteLater</a>();
        return;
    } else {
        // something broke.
<a name="x708"></a><a name="x704"></a>        TQMessageBox::<a href="ntqmessagebox.html#warning">warning</a>( qApp-&gt;<a href="ntqapplication.html#activeWindow">activeWindow</a>(),
                              <a href="ntqobject.html#tr">tr</a>( "TQt Mail Example" ),
                              <a href="ntqobject.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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