HttpWebRequest Exception on HTTP/1.0 204 No Content

[superseed]

Hi,

I'm currently coding in C# a class to control a PTZ (Pan Tilt Zoom)
Camera. To control the camera I have to send request on a CGI on it.

Something like this :

http://xxxxxx/axis-cgi/com/ptz.cgi?pan=100 (GET method) or using POST.

To do that I'm using the HttpWebRequest and HttpWebResponse class of
Microsoft .Net Framework 1.1.

Here is my code :

try
{
HttpWebRequest l_Req =
(HttpWebRequest )WebRequest.Cre ate(m_PtzUri.To String());
//construct header
l_Req.Headers.C lear();
l_Req.KeepAlive = false;
l_Req.Timeout = 2000;
l_Req.Method = "POST"; // POST or GET
string sMessage = _CommandLine;
l_Req.ContentLe ngth = sMessage.Length ;

//convert login:password to Base64 string
Encoding asciiEncoding = Encoding.ASCII;
byte[] byteArray = new byte[m_PtzUri.UserIn fo.Length];
byteArray = asciiEncoding.G etBytes(m_PtzUr i.UserInfo);

//Camera are using Authorization Basic
l_Req.Headers.A dd("Authorizati on", "Basic " +
Convert.ToBase6 4String(byteArr ay));
//standard url encode
l_Req.ContentTy pe = "applicatio n/x-www-form-urlencoded";

//write the post in the stream
Stream l_StreamReq = l_Req.GetReques tStream();
StreamWriter l_SWriter = new StreamWriter(l_ StreamReq);
l_SWriter.Write (sMessage);
l_SWriter.Flush ();

//send the request now, synchronous ! (Wait for answer)
HttpWebResponse l_Resp = (HttpWebRespons e)l_Req.GetResp onse();

//read the answer
if(l_Resp.Statu sCode == HttpStatusCode. NoContent)
LogViewer.Write Line(LogViewer. MessageType.Inf o, "Send",
_CommandLine);
l_StreamReq.Clo se();
}
catch(WebExcept ion e)
{
LogViewer.Write Line(LogViewer. MessageType.Exc eption, "WebExcepti on",
e.ToString());
return false;
}

When the command is send, the camera returns a HTTP/1.0 204 No Content
which means (RFC1945) :

204 No Content : The server has fulfilled the request but there is no
new information to send back.

Here is a ethereal capture :

[Client Request]
POST /axis-cgi/com/ptz.cgi HTTP/1.1
Authorization: Basic cm9vdDpsdHM1Y2F tZQ==
Content-Type: application/x-www-form-urlencoded
Content-Length: 6
Expect: 100-continue
Connection: Close
Host: xxxxxx
pan=0

[Server Response]
HTTP/1.0 204 No Content

So my problem is, the camera is moving, the reponse is send back as we
can see on ethereal capture. But the following line threws a TimeOut
Exception like if it didn't understand the HTTP/1.0 204 No Content :

HttpWebResponse l_Resp = (HttpWebRespons e)l_Req.GetResp onse();
Anyone can help me on this ? Thanks.

Christophe

[interwanderer]

no need to use that class.

just use javascript http request to send a header value to the asp.net page
and do a request header in the asp.net page. to send back the value just to a
response.write in the asp.net page and catch this in the javascript page.

I have used the http request like this ;-)

greets,
"su*******@gmai l.com" wrote:

Hi,

I'm currently coding in C# a class to control a PTZ (Pan Tilt Zoom)
Camera. To control the camera I have to send request on a CGI on it.

Something like this :

http://xxxxxx/axis-cgi/com/ptz.cgi?pan=100 (GET method) or using POST.

To do that I'm using the HttpWebRequest and HttpWebResponse class of
Microsoft .Net Framework 1.1.

Here is my code :

try
{
HttpWebRequest l_Req =
(HttpWebRequest )WebRequest.Cre ate(m_PtzUri.To String());
//construct header
l_Req.Headers.C lear();
l_Req.KeepAlive = false;
l_Req.Timeout = 2000;
l_Req.Method = "POST"; // POST or GET
string sMessage = _CommandLine;
l_Req.ContentLe ngth = sMessage.Length ;

//convert login:password to Base64 string
Encoding asciiEncoding = Encoding.ASCII;
byte[] byteArray = new byte[m_PtzUri.UserIn fo.Length];
byteArray = asciiEncoding.G etBytes(m_PtzUr i.UserInfo);

//Camera are using Authorization Basic
l_Req.Headers.A dd("Authorizati on", "Basic " +
Convert.ToBase6 4String(byteArr ay));
//standard url encode
l_Req.ContentTy pe = "applicatio n/x-www-form-urlencoded";

//write the post in the stream
Stream l_StreamReq = l_Req.GetReques tStream();
StreamWriter l_SWriter = new StreamWriter(l_ StreamReq);
l_SWriter.Write (sMessage);
l_SWriter.Flush ();

//send the request now, synchronous ! (Wait for answer)
HttpWebResponse l_Resp = (HttpWebRespons e)l_Req.GetResp onse();

//read the answer
if(l_Resp.Statu sCode == HttpStatusCode. NoContent)
LogViewer.Write Line(LogViewer. MessageType.Inf o, "Send",
_CommandLine);
l_StreamReq.Clo se();
}
catch(WebExcept ion e)
{
LogViewer.Write Line(LogViewer. MessageType.Exc eption, "WebExcepti on",
e.ToString());
return false;
}

When the command is send, the camera returns a HTTP/1.0 204 No Content
which means (RFC1945) :

204 No Content : The server has fulfilled the request but there is no
new information to send back.

Here is a ethereal capture :

[Client Request]
POST /axis-cgi/com/ptz.cgi HTTP/1.1
Authorization: Basic cm9vdDpsdHM1Y2F tZQ==
Content-Type: application/x-www-form-urlencoded
Content-Length: 6
Expect: 100-continue
Connection: Close
Host: xxxxxx
pan=0

[Server Response]
HTTP/1.0 204 No Content

So my problem is, the camera is moving, the reponse is send back as we
can see on ethereal capture. But the following line threws a TimeOut
Exception like if it didn't understand the HTTP/1.0 204 No Content :

HttpWebResponse l_Resp = (HttpWebRespons e)l_Req.GetResp onse();
Anyone can help me on this ? Thanks.

Christophe

[superseed]

As written in my post I'm coding a C# Application.

Anyway thanks for replying.

[interwanderer]

C# is a language. wich can be used in a web environment and/or windows.

"su*******@gmai l.com" wrote:

As written in my post I'm coding a C# Application.

Anyway thanks for replying.