<!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 --> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>A simple mail client</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 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 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for 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 3.3.8 edited Jan 11 14:37 $ ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of an example program for 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="f297"></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="x714"></a> <a href="qobject.html#connect">connect</a> ( socket, SIGNAL( <a href="qsocket.html#readyRead">readyRead</a>() ), this, SLOT( readyRead() ) ); <a name="x711"></a> <a href="qobject.html#connect">connect</a> ( socket, SIGNAL( <a href="qsocket.html#connected">connected</a>() ), this, SLOT( connected() ) ); <a name="x717"></a><a name="x715"></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="x707"></a> <a href="qobject.html#connect">connect</a>( mxLookup, SIGNAL(<a href="qdns.html#resultsReady">resultsReady</a>()), this, SLOT(dnsLookupHelper()) ); <a name="x716"></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( QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\n" ), QString::<a href="qstring.html#fromLatin1">fromLatin1</a>( "\r\n" ) ); message.replace( 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="f298"></a>Smtp::dnsLookupHelper() { <a name="x706"></a> <a href="qvaluelist.html">QValueList</a><QDns::MailServer> s = mxLookup-><a href="qdns.html#mailServers">mailServers</a>(); <a name="x720"></a> if ( s.<a href="qvaluelist.html#isEmpty">isEmpty</a>() ) { <a name="x705"></a> if ( !mxLookup-><a href="qdns.html#isWorking">isWorking</a>() ) emit status( <a href="qobject.html#tr">tr</a>( "Error in MX record lookup" ) ); return; } <a name="x719"></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="x710"></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="f299"></a>Smtp::connected() { <a name="x712"></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="f300"></a>Smtp::readyRead() { // SMTP is line-oriented <a name="x709"></a> if ( !socket-><a href="qsocket.html#canReadLine">canReadLine</a>() ) return; <a href="qstring.html">QString</a> responseLine; do { <a name="x713"></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="x718"></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 ) { <a href="qobject.html#deleteLater">deleteLater</a>(); return; } else { // something broke. <a name="x708"></a><a name="x704"></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>. <!-- 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>