why should I do when Stream.CanSeek is false

Question

I use this code to capture an image from IP Camera:

HttpWebRequest reqs = (HttpWebRequest)WebRequest.Create("http://" + ip + snapshotCommand);
reqs.Method = "POST";
reqs.Timeout = 4000;
reqs.Credentials = new NetworkCredential(user, pass);
reqs.PreAuthenticate = true;

HttpWebResponse resp = (HttpWebResponse)reqs.GetResponse();
if (resp != null)
{
    Stream stm = resp.GetResponseStream();
    img = new Bitmap(stm);
    stm.Close();
}

But stream threw an exception because CanSeek & CanWrite is false. I tried many ways, for example Copyto (MemoryStream), but the problem still persists. Would you please help me on that?

This is the code using MemoryStream:

Stream stm = resp.GetResponseStream(); 
MemoryStream ms = new MemoryStream(); 
stm.CopyTo(ms); 
ms.Position = 0;

And this "ms" for ReadTimeout & WriteTimeout threw: Message "Timeouts are not supported on this stream." Because canTimeout() is false for MemoryStream too.

Finally I found this solution, and it works well: https://stackoverflow.com/a/2368505/492628

show the code that copied to a `MemoryStream` and the error you got — Brandon, Apr 06 '17 at 18:25
Don't paste code into comments; such code is unreadable. Please edit the question and paste the code there. — , Apr 06 '17 at 18:42

score 2 · Answer 1 · edited May 23 '17 at 11:54

2

You should be able to copy the stream into a memory stream if it isn't seekable

Here's a post that might help.

edited May 23 '17 at 11:54

Community

1
1

answered Apr 06 '17 at 18:41

Jofairden

95
9

I added my code to the question. This solution threw exception too. – Negar Apr 06 '17 at 18:49
1

The problem could be on the vendor's side in the webservice provider. – Jofairden Apr 06 '17 at 18:52
I capture `image` with snapshot command easily in Browser, but with reading stream in my code, there are these problem – Negar Apr 06 '17 at 18:58

why should I do when Stream.CanSeek is false

1 Answers1