source: trunk/doc/html/archivesearch-example.html

Last change on this file was 190, checked in by rudi, 14 years ago

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[190]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/network/archivesearch/archivesearch.doc:5 -->
3<html>
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
6<title>A qt-interest mail archive search</title>
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16<table border="0" cellpadding="0" cellspacing="0" width="100%">
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19 <a href="index.html">
20<font color="#004faf">Home</font></a>
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30<font color="#004faf">Functions</font></a>
31</td>
32<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A qt-interest mail archive search</h1>
33
34
35<p>
36<p> This example does a search on the qt-interest mailinglist archives. It uses
37<a href="qhttp.html">QHttp</a> to issue the search command and to fetch the results. The GUI parts
38were done using <a href="designer-manual.html">Qt Designer</a>.
39<p> <hr>
40<p> The implementation of the HTTP requests (archivedialog.ui.h):
41<p> <pre>/****************************************************************************
42** $Id: archivesearch-example.html 2051 2007-02-21 10:04:20Z chehrlic $
43**
44** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
45**
46** This file is part of an example program for Qt. This example
47** program may be used, distributed and modified without limitation.
48**
49*****************************************************************************/
50
51/****************************************************************************
52** ui.h extension file, included from the uic-generated form implementation.
53**
54** If you wish to add, delete or rename functions or slots use
55** Qt Designer which will update this file, preserving your code. Create an
56** init() function in place of a constructor, and a destroy() function in
57** place of a destructor.
58*****************************************************************************/
59
60void ArchiveDialog::init()
61{
62 connect(&amp;articleSearcher, SIGNAL(done(bool)), this, SLOT(searchDone(bool)));
63 connect(&amp;articleFetcher, SIGNAL(done(bool)), this, SLOT(fetchDone(bool)));
64 connect(myListView, SIGNAL(selectionChanged(QListViewItem*)), this, SLOT(fetch(QListViewItem*)));
65 connect(myLineEdit, SIGNAL(returnPressed()), this, SLOT(search()));
66 connect(myListView, SIGNAL(returnPressed(QListViewItem*)), this, SLOT(fetch(QListViewItem*)));
67 connect(myPushButton, SIGNAL(clicked()), this, SLOT(close()));
68}
69
70void ArchiveDialog::fetch( <a href="qlistviewitem.html">QListViewItem</a> *it )
71{
72<a name="x477"></a> <a href="qurl.html">QUrl</a> u(it-&gt;<a href="qlistviewitem.html#text">text</a>(1));
73<a name="x485"></a> articleFetcher.setHost(u.<a href="qurl.html#host">host</a>());
74 articleFetcher.get(it-&gt;<a href="qlistviewitem.html#text">text</a>(1));
75}
76
77void ArchiveDialog::fetchDone( bool error )
78{
79 if (error) {
80<a name="x478"></a> QMessageBox::<a href="qmessagebox.html#critical">critical</a>(this, "Error fetching",
81 "An error occurred when fetching this document: "
82 + articleFetcher.errorString(),
83 QMessageBox::Ok, QMessageBox::NoButton);
84 } else {
85 myTextBrowser-&gt;setText(articleFetcher.readAll());
86 }
87}
88
89void ArchiveDialog::search()
90{
91 if (articleSearcher.state() == QHttp::HostLookup
92 || articleSearcher.state() == QHttp::Connecting
93 || articleSearcher.state() == QHttp::Sending
94 || articleSearcher.state() == QHttp::Reading) {
95 articleSearcher.abort();
96 }
97
98 if (myLineEdit-&gt;text() == "") {
99 QMessageBox::<a href="qmessagebox.html#critical">critical</a>(this, "Empty query",
100 "Please type a search string.",
101 QMessageBox::Ok, QMessageBox::NoButton);
102 } else {
103<a name="x474"></a> QApplication::<a href="qapplication.html#setOverrideCursor">setOverrideCursor</a>(QCursor(Qt::WaitCursor));
104
105 articleSearcher.setHost("lists.trolltech.com");
106
107 <a href="qhttprequestheader.html">QHttpRequestHeader</a> header("POST", "/qt-interest/search.php");
108<a name="x476"></a> header.<a href="qhttpheader.html#setValue">setValue</a>("Host", "lists.trolltech.com");
109<a name="x475"></a> header.<a href="qhttpheader.html#setContentType">setContentType</a>("application/x-www-form-urlencoded");
110
111 <a href="qstring.html">QString</a> encodedTopic = myLineEdit-&gt;text();
112<a name="x484"></a> QUrl::<a href="qurl.html#encode">encode</a>(encodedTopic);
113 <a href="qstring.html">QString</a> searchString = "qt-interest=on&amp;search=" + encodedTopic;
114
115<a name="x483"></a> articleSearcher.request(header, searchString.<a href="qstring.html#utf8">utf8</a>());
116 }
117
118}
119
120void ArchiveDialog::searchDone( bool error )
121{
122 if (error) {
123 QMessageBox::<a href="qmessagebox.html#critical">critical</a>(this, "Error searching",
124 "An error occurred when searching: "
125 + articleSearcher.errorString(),
126 QMessageBox::Ok, QMessageBox::NoButton);
127 } else {
128 <a href="qstring.html">QString</a> result(articleSearcher.readAll());
129
130 <a href="qregexp.html">QRegExp</a> rx("&lt;a href=\"(http://lists\\.trolltech\\.com/qt-interest/.*)\"&gt;(.*)&lt;/a&gt;");
131<a name="x482"></a> rx.<a href="qregexp.html#setMinimal">setMinimal</a>(TRUE);
132 int pos = 0;
133 while (pos &gt;= 0) {
134<a name="x481"></a> pos = rx.<a href="qregexp.html#search">search</a>(result, pos);
135 if (pos &gt; -1) {
136<a name="x480"></a> pos += rx.<a href="qregexp.html#matchedLength">matchedLength</a>();
137<a name="x479"></a> new <a href="qlistviewitem.html">QListViewItem</a>(myListView, rx.<a href="qregexp.html#cap">cap</a>(2), rx.<a href="qregexp.html#cap">cap</a>(1));
138 }
139 }
140 }
141
142<a name="x473"></a> QApplication::<a href="qapplication.html#restoreOverrideCursor">restoreOverrideCursor</a>();
143}
144</pre>
145
146<p> <hr>
147<p> Main (main.cpp):
148<p> <pre>/****************************************************************************
149** $Id: archivesearch-example.html 2051 2007-02-21 10:04:20Z chehrlic $
150**
151** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
152**
153** This file is part of an example program for Qt. This example
154** program may be used, distributed and modified without limitation.
155**
156*****************************************************************************/
157
158#include "archivedialog.h"
159#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
160
161int main(int argc, char **argv)
162{
163 <a href="qapplication.html">QApplication</a> a( argc, argv );
164 ArchiveDialog ad;
165 ad.show();
166
167<a name="x489"></a><a name="x487"></a> QObject::<a href="qobject.html#connect">connect</a>( &amp;a, SIGNAL(<a href="qapplication.html#lastWindowClosed">lastWindowClosed</a>()),
168<a name="x488"></a> &amp;a, SLOT(<a href="qapplication.html#quit">quit</a>()) );
169
170<a name="x486"></a> return a.<a href="qapplication.html#exec">exec</a>();
171}
172</pre>
173
174<p>See also <a href="network-examples.html">Network Examples</a>.
175
176<!-- eof -->
177<p><address><hr><div align=center>
178<table width=100% cellspacing=0 border=0><tr>
179<td>Copyright &copy; 2007
180<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
181<td align=right><div align=right>Qt 3.3.8</div>
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