Noob Question about html

#1 June 9th, 2006, 12:45 AM

Hi,

I want to write a pearl script that will go out to a web
site and download the page. Then pull certain value pairs
out of it. Basically I want to see graphs of snr etc.

Is grabbing the html possible in perl? I know the parsing
is. Basically I want to see if any of the values change and
it corresponds to cable outages.

example web page to parse
=================================
<html>
<head>
<title>Thomson Cable Modem Diagnostics</title>
<META HTTP-EQUIV="Refresh" CONTENT="5">
</head>
<body link="#FFFFFF" vlink="#FFFFFF" alink="#000000"
bgcolor="#7686B6">

<table border="0" cellpadding="0" cellspacing="0" width="500">
<tr>
<td width="134" height="58" bgcolor="#394a84"
align="center"><img src="images/thomson.gif" width="103"
height="34"></td>
<td width="506" height="58" bgcolor="#394a84"
colspan="4"><big><big>  Modem Technical Details
Status Page</big></big>     This
page will auto-refresh periodically.</td>
</tr>
<tr>
<td width="134" height="108" bgcolor="#394a84"
rowspan="4"><img src="images/space.gif" width="134"
height="9">   Status
Code:   
  Operational 
  Software Version:   
ST.23.16.50   Software Model:   
0719   Bootloader:   
04.01</td>
<td width="506" height="18" colspan="4"><img
src="images/topcorner.gif" width="506" height="9"> 
    &nbsp ; 
Cable Signal Details </td>
</tr>
<tr>
<td width="18" height="90"
rowspan="3">    </td>
<td width="290" height="9" bgcolor="#FFFFFF"><img
src="images/top1.gif" width="290" height="9"></td>
<td width="180" height="9" bgcolor="#FFFFFF"><img
src="images/top2.gif" width="180" height="9"></td>
<td width="18" height="90" rowspan="3">  </td>
</tr>
<tr>
<td width="290" bgcolor="#FFFFFF">   Forward
Path: 
        Signal Acquired
at 729.025 MHz 
        SNR: 36.1 dB 
        Received Signal
Strength: -0.3 dBmV 
       
Micro-Reflections: 22 dBc 
        Modulation: 256
QAM <big><big>  </big></big></td>
<td width="180" bgcolor="#FFFFFF">Return Path: 
     Connection: Acquired 
     Frequency: 37 MHz 
     Power Level: 46.2 dBmV 
     Channel ID: 4 
     Modulation: 16 QAM 
<big><big>  </big></big></td>
</tr>
<tr>
<td width="290" height="9" bgcolor="#FFFFFF"><img
src="images/bot1.gif" width="290" height="9"></td>
<td width="180" height="9" bgcolor="#FFFFFF"><img
src="images/bot2.gif" width="180" height="9"></td>
</tr>
<tr>
<td width="134" height="18"
bgcolor="#394a84">  <a href="diagnostics.htm">Back to
Diagnostics</a></td>
<td width="506" height="18"
colspan="4">       Data
Service Details</td>
</tr>
<tr>
<td width="134" height="90" bgcolor="#394a84"
rowspan="3"></td>
<td width="18" height="90"
rowspan="3">    </td>
<td width="470" height="9" bgcolor="#FFFFFF"
colspan="2"><img src="images/top.gif" width="470"
height="9"></td>
<td width="18" height="90" rowspan="3">  </td>
</tr>
<tr>
<td width="470" bgcolor="#FFFFFF"
colspan="2">   
Provisioned Address: Yes     Provisioned
Time: Yes     Provisioned Configuration:
Yes     Registered: Yes 
    BPI: Enabled <big> 
</big></td>
</tr>
<tr>
<td width="470" height="9" bgcolor="#FFFFFF"
colspan="2"><img src="images/bot.gif" width="470"
height="9"></td>
</tr>
<tr>
<td width="134" height="52"><img
src="images/botcorner.gif" width="134" height="52"></td>
<td width="506" height="52" colspan="4"></td>
</tr>

</table>
</body>
</html>

=================================

#2 June 9th, 2006, 01:45 AM

In article <0tmdnavb98urKhXZnZ2dnUVZ_uqdnZ2d@comcast.com>, no one
<noBody@NoWhere.Com> wrote:
[color=blue]
> Hi,
>
> I want to write a pearl script that will go out to a web
> site and download the page. Then pull certain value pairs
> out of it. Basically I want to see graphs of snr etc.
>
> Is grabbing the html possible in perl? I know the parsing
> is. Basically I want to see if any of the values change and
> it corresponds to cable outages.[/color]

See the Perl FAQ entries "How do I fetch an HTML file?" and "How do I
remove HTML from a string?".

If you have Perl installed:

perldoc -q HTML

FYI: this newsgroup is defunct; use comp.lang.perl.misc in the future.

#3 June 9th, 2006, 04:05 AM

no one wrote:[color=blue]
> Is grabbing the html possible in perl?[/color]

You could do it exactly the way it is described in the FAQ:
"How do I fetch an HTML file?"
[color=blue]
> I know the parsing is.[/color]

True, but I hope you intend to do it the right way and not by using some
"smart" use of REs? See FAQ
"How do I remove HTML from a string?"
for a few examples of why contrary to popular believe parsing HTML is not
trivial.

jue

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