How to sets the system.io.stream object for write a value

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I've been tried doing for a day or so but can't make it work !

I want to set an System.IO.Stream object for further usage ! like WebRequest.GetRequestStream()

any help would be appreciated !

What I have tried:

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.IO;

namespace Utility
{
internal class HttpRequest
{

private string url;
public byte[] header_bytes;

protected const string crLf = "\r\n";

private Version _version = HttpVersion.Version11;

public NameValueCollection headers
{
get;
set;
}

public string method
{
get;
set;
}

public Version version
{
get { return _version; }
set { _version = value; }
}

public HttpRequest ( string url )
{
this.url = url;
headers = new NameValueCollection ();
}

public static HttpRequest create ( Uri uri )
{
var req = new HttpRequest (uri.PathAndQuery);
req.headers ["Host"] = uri.DnsSafeHost;

return req;
}

public Stream get_stream ()
{
get_header_bytes ();
return new MemoryStream(header_bytes);
}

public HttpResponse get_response ( Stream stream )
{
if ( header_bytes == null ) get_header_bytes ();
stream.Write (header_bytes , 0 , header_bytes.Length);

return HttpResponse.read (stream);
}

private void get_header_bytes ()
{
var header = new StringBuilder ();
header.AppendFormat ("{0} {1} HTTP/{2}{3}" , method , url , version , crLf);

foreach ( var key in headers.AllKeys )
header.AppendFormat ("{0}: {1}{2}" , key , headers [key] , crLf);

header.AppendLine ();
header_bytes = Encoding.UTF8.GetBytes (header.ToString ());
}

}
}

What i want to do is

var post_data = Encoding.UTF8.GetBytes("name=value");

var request = HttpRequest.create (new Uri (url));
request.method = verb.ToString ();

using ( var ss = request.get_stream () )
ss.Write (post_data , 0 , post_data.Length);

I can't append the ss (Stream) with more data :(

Posted 14-Apr-16 9:16am

nazarinlaw

Updated 14-Apr-16 11:59am

v2

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Comments

Richard Deeming 14-Apr-16 15:20pm

Your code samples are incomplete - what does get_header_bytes do, and where is header_bytes defined?

You also haven't told us what the problem is.

ZurdoDev 14-Apr-16 15:34pm

What exactly is your question?

nazarinlaw 14-Apr-16 16:01pm

Sorry for my bad english i just don't know a way to ask this ! i updated the question

2 solutions

Solution 2

C#

var temp_bytes = header_bytes;

          header_bytes = new byte [1024];

          var ret = new MemoryStream (header_bytes , 0 , 1024 , true);
          ret.Write (temp_bytes , 0 , temp_bytes.Length);
          return ret;

I finally found it myself ! thank you

Richard Deeming

i dig deep into memorystream and found the solution ! really appreciated

Posted 14-Apr-16 11:59am

nazarinlaw

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Richard Deeming · Accepted Answer · 2016-04-14T10:16:00

Solution 1

When you create a new MemoryStream passing in a byte array, the capacity of that stream is limited to the size of the byte array you pass in.

MemoryStream Constructor (Byte[])[^]:

Initializes a new non-resizable instance of the MemoryStream class based on the specified byte array.

You need to use the default constructor, or the constructor that specifies the initial capacity:

C#

var result = new MemoryStream(header_bytes.Length);
result.Write(header_bytes, 0, header_bytes.Length);
return result;

You'll then be able to write additional bytes to the stream.

Posted 14-Apr-16 10:16am

Richard Deeming

Comments

nazarinlaw 14-Apr-16 17:07pm

I've tried it is not working ! Still can't append additional bytes :(

Richard Deeming 14-Apr-16 17:18pm

Then you're not using the code I posted.

See this example[^] - writing additional bytes to the MemoryStream works perfectly.

nazarinlaw 14-Apr-16 17:33pm

click me[^]

Please check my code and show me what i did wrong :)

Richard Deeming 14-Apr-16 17:35pm

You're writing out the contents from t.bytes, not the MemoryStream:
Updated example[^]

In case you miss it, the difference is the third and finaly foreach loop.

You had:
foreach (byte b in t.bytes)
when it should be:
foreach (byte b in ms.ToArray())

nazarinlaw 14-Apr-16 17:40pm

you are displaying your ms bytes not the one on class Test

Kindly check it please[^]

Richard Deeming 14-Apr-16 17:43pm

That's the point!

Your question was about writing to the MemoryStream. My answer showed you how to write to the MemoryStream. My code samples showed you how to write to the MemoryStream.

And now, from nowhere, your question is suddenly about why writing to the MemoryStream doesn't update an unrelated byte array?!

Writing to the MemoryStream updates the MemoryStream. It doesn't magically change some unrelated array!

nazarinlaw 14-Apr-16 17:50pm

Richard Deeming 14-Apr-16 17:55pm

Because in that instance, you're creating a fixed size MemoryStream which uses that byte array behind the scenes.

The only way to resize an array is to create a new array and copy the existing values across. Doing that would break the connection with the array you've passed in, which is why that constructor creates a fixed size stream.

nazarinlaw 14-Apr-16 18:01pm

Thanks :)

nazarinlaw 14-Apr-16 17:52pm

Just to be straight ! i want to update the header_bytes on class Utility from main() class without modifying !

nazarinlaw 14-Apr-16 17:54pm

i just thought i could use memorystream since it is straight forward ! any ideas ?

Richard Deeming 14-Apr-16 18:01pm

Replace the byte array with a MemoryStream, and just write the header bytes into that stream.

private MemoryStream header_bytes;

public Stream get_stream()
{
   return header_bytes ?? (header_bytes = get_header_bytes());
}

private MemoryStream get_header_bytes()
{
   var header = new StringBuilder();
   header.AppendFormat("{0} {1} HTTP/{2}{3}" , method , url , version , crLf);

   foreach ( var key in headers.AllKeys )
   {
      header.AppendFormat ("{0}: {1}{2}" , key , headers [key] , crLf);
   }
   
   header.AppendLine ();
   
   var bytes = Encoding.UTF8.GetBytes(header.ToString());
   var result = new MemoryStream(bytes.Length);
   result.Write(bytes, 0, bytes.Length);
   return result;
}

public HttpResponse get_response(Stream stream)
{
   var header_bytes = get_stream();
   header_bytes.WriteTo(stream);
   return HttpResponse.read (stream);
}

Richard Deeming 14-Apr-16 18:03pm

Alternatively, use the built-in WebRequest[^] and WebResponse[^] classes, or the WebClient[^] class.

nazarinlaw 14-Apr-16 18:06pm

Actually i've been working on socket connection since webproxy don't support socks5 or socks4 connection :)

Sergey Alexandrovich Kryukov 14-Apr-16 19:09pm

5ed.
—SA