HttpWebRequest - data is truncated?

[Logician]

I am looking for some help about the method below which partly works.
The problem is that the data returned is truncated in that the
returned data has missing bytes near the beginning of the data. I am
using VS 2005 and C#.

Has anyone got any ideas?

public string getWebPage(stri ng url)
{
// add error handling
StringBuilder sb = new StringBuilder() ;
byte[] buf = new byte[8192];
try
{
HttpWebRequest request = (HttpWebRequest )WebRequest.Cre ate(url);
request.UserAge nt = "Mozilla/5.0 (Windows; U; Windows NT 5.1; de-
DE;"+
"rv:1.7.5) Gecko/20041108 Firefox/1.0";
request.Timeout =20000;
HttpWebResponse response = (HttpWebRespons e)request.GetRe sponse();
Stream responseStream = response.GetRes ponseStream();
StreamReader myTextReader = new StreamReader(re sponseStream);
char[] strBuffer = new char[25];
myTextReader.Re adBlock(strBuff er,0,25);
string stringBuffer = new string(strBuffe r);
if (stringBuffer.I ndexOf("GIF8")>-1 ||
stringBuffer.In dexOf("JFIF")>-1)
{
// image found
return "image";
}
else
{
// this is a text page
}
string tempString = null;
int count = 0;
do
{
count = responseStream. Read(buf,0,buf. Length);
if (count!=0)
{
tempString=Enco ding.ASCII.GetS tring(buf,0,cou nt);
sb.Append(tempS tring);
}
}while (count>0);
}
catch (WebException e)
{
return "ZenoBot getWebPage web failed to fetch "+e.ToString(); ;
}
catch (Exception e)
{
return "ZenoBot getWebPage web failed to fetch "+e.ToString(); ;
}

return sb.ToString();
}
}

[Jon Skeet [C# MVP]]

Logician <sa***@logician s.comwrote:

I am looking for some help about the method below which partly works.
The problem is that the data returned is truncated in that the
returned data has missing bytes near the beginning of the data. I am
using VS 2005 and C#.

The StreamReader is probably buffering data - reading more than 25
bytes and then saving it in its buffer.

Instead of using a StreamReader, just use the Stream directly to start
with. You're interested in the bytes which represent "GIF8", not the
actual *text* "GIF8", right?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
World class .NET training in the UK: http://iterativetraining.co.uk

[Logician]

On Apr 24, 10:15*pm, Jon Skeet [C# MVP] <[e-mail] mwrote:

Logician <sa...@logician s.comwrote:

I am looking for some help about the method below which partly works.
The problem is that the data returned is truncated in that the
returned data has missing bytes near the beginning of the data. I am
using VS 2005 and C#.

The StreamReader is probably buffering data - reading more than 25
bytes and then saving it in its buffer.

Instead of using a StreamReader, just use the Stream directly to start
with. You're interested in the bytes which represent "GIF8", not the
actual *text* "GIF8", right?

--
Jon Skeet - <[e-mail] m>http://www.pobox.com/~skeet* Blog:http://www.msmvps.com/jon.skeet
World class .NET training in the UK:http://iterativetraining.co.uk

Yes the 25 bytes was the issue. I saw code at
http://weblogs.asp.net/guys/archive/...21/414118.aspx which
helped a lot.