Question

How to parse html on localhost in ansi C

Asked by: PjotterR

Hi,

I need to parse a piece of html code on the localhost of an Alladin dongle setup to extract the id of the dongle. The html page looks like this;

{ "ndx":"2", "ven":"DEMOMA - evaluation","vid":"37515", "haspname":"1223941633","haspid":"1223941633","noid":"0","isc":"0", "isloc":"1","loc":.... etc }

This file generate by the localhost as http://localhost:1947/_int_/tab_dev.html.

De question is how can I access this file in ansi C  DLL and extract the haspid easily?

Thanks

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Asked On
2009-11-05 at 05:21:45ID24874248
Tags

parse

,

html

,

c

Topics

C++ Programming Language

,

C Programming Language

Participating Experts
3
Points
500
Comments
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Answers

 

by: ZoppoPosted on 2009-11-05 at 06:38:56ID: 25749862

Hi PjotterR,

what exactly is you problem?

IMO there are three different functionalities involved:
a) how to parse the string read from a file
b) read the string from a file
c) send a HTML request to the shown URL and recieve the file returned

If you have problems with more than one IMO you should ask a question for each ...

For a) I attached some sample code which parses a string as that one you posted here to find the part after "haspid".

ZOPPO

int ParseHaspId( const char* pszString, char* pszId )
{
 char* pszData = strdup( pszString );
 char* pszQuery = "\"haspid\":\"";
 int nLen = 0; 
 char* pCurrent = strtok( pszData, "," ); 
 while( NULL != pCurrent )
 {
  if ( strstr( pCurrent, pszQuery ) == pCurrent )
  {
   pCurrent += strlen( pszQuery ); 
   nLen = strspn( pCurrent, "0123456789" ); 
   strncpy( pszId, pCurrent, nLen ); 
   break;
  } 
  pCurrent = strtok( NULL, "," );
 } 
 free( pszData ); 
 return nLen;
} 
 
// Usage sample
...
const char* pszData = "{ \"ndx\":\"2\", \"ven\":\"DEMOMA - evaluation\",\"vid\":\"37515\", \"haspname\":\"1223941633\",\"haspid\":\"1223941633 \" ,\"noid\":\"0\",\"isc\":\"0\", \"isloc\":\"1\",\"loc\":.... etc }"; 
char* pszId = (char*)calloc( 32, sizeof( char ) ); 
if ( 0 != TestC( pszData, pszId ) )
{
 printf( "ID: '%s'\n", pszId );
} 
free( pszId );
...

                                              
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by: PjotterRPosted on 2009-11-05 at 07:59:06ID: 25750820

Thanks Zoppo,

I am sorry i was not clear enough. My problem is what you call c). How to do the request and receive the file for further parsing like you suggested.

 

by: ZoppoPosted on 2009-11-05 at 08:20:25ID: 25751038

Well, to do this you'll have to use OS-specific libraries for socket-implementation (i.e. 'winsock' for Windows)

Here you can find a detailed (and large) tutorial about programming sockets i.e. for use with different protocols: http://beej.us/guide/bgnet/

ZOPPO

 

by: jkrPosted on 2009-11-05 at 08:51:04ID: 25751393

If you are on Windows, that part would be easy:

URLDownloadToFile(NULL,"http://localhost:1947/_int_/tab_dev.html", "temp.html",0,NULL);

                                              
1:

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by: InternalStaticPosted on 2009-11-06 at 21:42:25ID: 25765139

Just a small technicality (though it may help), the sample you provided:

{ "ndx":"2", "ven":"DEMOMA - evaluation","vid":"37515", "haspname":"1223941633","haspid":"1223941633","noid":"0","isc":"0", "isloc":"1","loc":.... etc }

Actually is not HTML; it's a standardized data interchange format. This format is known as JSON (JavaScript Object Notation). I'm not sure whether or not this will help you, but knowing what terminology to use when searching may help you out :] the world of HTML has become rather sloppy, and this being stored in an HTML file is an example of this.

Just figured you might like to know that.

Hope it helps,

Nate

20120131-EE-VQP-002

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