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<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="description" content="HTTrack is an easy-to-use website mirror utility. It allows you to download a World Wide website from the Internet to a local directory,building recursively all structures, getting html, images, and other files from the server to your computer. Links are rebuiltrelatively so that you can freely browse to the local site (works with any browser). You can mirror several sites together so that you can jump from one toanother. You can, also, update an existing mirror site, or resume an interrupted download. The robot is fully configurable, with an integrated help" />
<meta name="keywords" content="httrack, HTTRACK, HTTrack, winhttrack, WINHTTRACK, WinHTTrack, offline browser, web mirror utility, aspirateur web, surf offline, web capture, www mirror utility, browse offline, local site builder, website mirroring, aspirateur www, internet grabber, capture de site web, internet tool, hors connexion, unix, dos, windows 95, windows 98, solaris, ibm580, AIX 4.0, HTS, HTGet, web aspirator, web aspirateur, libre, GPL, GNU, free software" />
<title>HTTrack Website Copier - Offline Browser</title>
<style type="text/css">
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background-color: #ccd;
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</head>
<table width="76%" border="0" align="center" cellspacing="0" cellpadding="0" class="tableWidth">
<tr>
<td><img src="images/header_title_4.gif" width="400" height="34" alt="HTTrack Website Copier" title="" border="0" id="title" /></td>
</tr>
</table>
<table width="76%" border="0" align="center" cellspacing="0" cellpadding="3" class="tableWidth">
<tr>
<td id="subTitle">Open Source offline browser</td>
</tr>
</table>
<table width="76%" border="0" align="center" cellspacing="0" cellpadding="0" class="tableWidth">
<tr class="blak">
<td>
<table width="100%" border="0" align="center" cellspacing="1" cellpadding="0">
<tr>
<td colspan="6">
<table width="100%" border="0" align="center" cellspacing="0" cellpadding="10">
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<td id="pageContent">
<!-- ==================== End prologue ==================== -->
<h2 align="center"><em>HTTrack Programming page - plugging functions</em></h2>
<br>
You can write external functions to be plugged in the httrack library very easily.
We'll see there some examples.
<br><br>
The <tt>httrack</tt> commandline tool allows (since the 3.30 release) to plug external functions to various callbacks defined in httrack.<br>
See also: the <tt>httrack-library.h</tt> prototype file, and the <tt>callbacks-example.c</tt> given in the httrack archive.<br>
<br>
Example:
<tt>
httrack --wrapper check-html=callback:process_file ..
</tt>
<br>
With the callback.so (or callback.dll) module defined as below:
<pre>
int process_file(char* html, int len, char* url_adresse, char* url_fichier) {
printf("now parsing %s%s..\n", url_adresse, url_fichier);
strcpy(currentURLBeingParsed, url_adresse);
strcat(currentURLBeingParsed, url_fichier);
return 1; /* success */
}
</pre>
Below the list of callbacks, and associated external wrappers:<br>
<table width="100%">
<tr>
<td><b>"<i>callback name</i>"</b></td><td><b>callback description</b></td><td><b>callback function signature</b></td>
<tr><td background="img/fade.gif">"<i>init</i>"</td><td background="img/fade.gif">Called during initialization<br>return value: none</td><td background="img/fade.gif"><tt>void (* myfunction)(void);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>free</i>"</td><td background="img/fade.gif">Called during un-initialization<br>return value: none</td><td background="img/fade.gif"><tt>void (* myfunction)(void);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>start</i>"</td><td background="img/fade.gif">Called when the mirror starts. The <tt>opt</tt> structure passed lists all options defined for this mirror. You may modify the <tt>opt</tt> structure to fit your needs<br>return value: 1 upon success, 0 upon error (the mirror will then be aborted)</td><td background="img/fade.gif"><tt>int (* myfunction)(httrackp* opt);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>end</i>"</td><td background="img/fade.gif">Called when the mirror ends<br>return value: 1 upon success, 0 upon error (the mirror will then be considered aborted)</td><td background="img/fade.gif"><tt>int (* myfunction)(void);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>change-options</i>"</td><td background="img/fade.gif">Called when options are to be changed. The <tt>opt</tt> structure passed lists all options, updated to take account of recent changes<br>return value: 1 upon success, 0 upon error (the mirror will then be aborted)</td><td background="img/fade.gif"><tt>int (* myfunction)(httrackp* opt);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>check-html</i>"</td><td background="img/fade.gif">Called when a document (which may not be an html document) is to be parsed. The <tt>html</tt> address points to the document data, of lenth <tt>len</tt>. The <tt>url_adresse</tt> and <tt>url_fichier</tt> are the address and URI of the file being processed<br>return value: 1 if the parsing can be processed, 0 if the file must be skipped without being parsed</td><td background="img/fade.gif"><tt>int (* myfunction)(char* html,int len,char* url_adresse,char* url_fichier);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>query</i>"</td><td background="img/fade.gif">Called when the wizard needs to ask a question. The <tt>question</tt> string contains the question for the (human) user<br>return value: the string answer ("" for default reply)</td><td background="img/fade.gif"><tt>char* (* myfunction)(char* question);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>query2</i>"</td><td background="img/fade.gif">Called when the wizard needs to ask a question</td><td background="img/fade.gif"><tt>char* (* myfunction)(char* question);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>query3</i>"</td><td background="img/fade.gif">Called when the wizard needs to ask a question</td><td background="img/fade.gif"><tt>char* (* myfunction)(char* question);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>loop</i>"</td><td background="img/fade.gif">Called periodically (informational, to display statistics)<br>return value: 1 if the mirror can continue, 0 if the mirror must be aborted</td><td background="img/fade.gif"><tt>int (* myfunction)(lien_back* back,int back_max,int back_index,int lien_tot,int lien_ntot,int stat_time,hts_stat_struct* stats);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>check-link</i>"</td><td background="img/fade.gif">Called when a link has to be tested. The <tt>adr</tt> and <tt>fil</tt> are the address and URI of the link being tested. The passed <tt>status</tt> value has the following meaning: 0 if the link is to be accepted by default, 1 if the link is to be refused by default, and -1 if no decision has yet been taken by the engine<br>return value: same meaning as the passed <tt>status</tt> value ; you may generally return -1 to let the engine take the decision by itself</td><td background="img/fade.gif"><tt>int (* myfunction)(char* adr,char* fil,int status);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>pause</i>"</td><td background="img/fade.gif">Called when the engine must pause. When the <tt>lockfile</tt> passed is deleted, the function can return<br>return value: none</td><td background="img/fade.gif"><tt>void (* myfunction)(char* lockfile);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>save-file</i>"</td><td background="img/fade.gif">Called when a file is to be saved on disk<br>return value: none</td><td background="img/fade.gif"><tt>void (* myfunction)(char* file);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>link-detected</i>"</td><td background="img/fade.gif">Called when a link has been detected<br>return value: 1 if the link can be analyzed, 0 if the link must not even be considered</td><td background="img/fade.gif"><tt>int (* myfunction)(char* link);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>transfer-status</i>"</td><td background="img/fade.gif">Called when a file has been processed (downloaded, updated, or error)<br>return value: must return 1</td><td background="img/fade.gif"><tt>int (* myfunction)(lien_back* back);</tt></td></tr>
<tr><td background="img/fade.gif">"<i>save-name</i>"</td><td background="img/fade.gif">Called when a local filename has to be processed. The <tt>adr_complete</tt> and <tt>fil_complete</tt> are the address and URI of the file being saved ; the <tt>referer_adr</tt> and <tt>referer_fil</tt> are the address and URI of the referer link. The <tt>save</tt> string contains the local filename being used. You may modifiy the <tt>save</tt> string to fit your needs, up to 1024 bytes (note: filename collisions, if any, will be handled by the engine by renaming the file into file-2.ext, file-3.ext ..).<br>return value: must return 1</td><td background="img/fade.gif"><tt>int (* myfunction)(char* adr_complete,char* fil_complete,char* referer_adr,char* referer_fil,char* save);</tt></td></tr>
</table>
<br><br>
<br><br>
<!-- ==================== Start epilogue ==================== -->
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<table width="76%" border="0" align="center" valign="bottom" cellspacing="0" cellpadding="0">
<tr>
<td id="footer"><small>© 2003 Xavier Roche & other contributors - Web Design: Leto Kauler.</small></td>
</tr>
</table>
</body>
</html>
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