Re: MemoryStream??

From: Charles A. Lackman (Charles_at_CreateItSoftware.net)
Date: 02/11/05 

Date: Fri, 11 Feb 2005 10:27:06 -0800

Hello,

I have rewritten the stream directly to a file and still get the same error
(Freeze). I also changed the Session timeout on my server to last longer
(still same problem). Hmmm??

The Error I get is:

 unable to read data from transport connection

Code For CopyData:

Private Sub CopyData(ByVal FromStream As Stream, ByVal ToStream As Stream)
Dim intBytesRead As Integer
Dim Counter As Integer = 0
Const intSize As Integer = 1024
Dim bytes(intSize) As Byte
ProgressBar1.Step = 1024
intBytesRead = FromStream.Read(bytes, 0, intSize)
While intBytesRead > 0
ToStream.Write(bytes, 0, intBytesRead)
intBytesRead = FromStream.Read(bytes, 0, intSize)
end Sub

Chuck

"Fred Hirschfeld" <a@b.c> wrote in message
news:u5UgEZEEFHA.1012@TK2MSFTNGP14.phx.gbl...
> For one, if your intent is to store it in a file and never use it in
> memory
> then you simply need to put it into the file stream directly. I would
> recommend using a buffered loop to stream the file data from the response
> stream to the file stream until there is no more data.
>
> c# but easily translated and maybe this is what copy data is?:
> FileStream fos = new FileStream(Name, FileMode.Create);
> byte[] buf = new byte[4096];
> int bytes = 0;
> while((bytes = TheResponse.Read(buf, 0, 4096)) > 0) {
> fos.Write(buf, 0, bytes);
> }
> fos.close();
> TheResponse.close();
>
> Do you get any exceptions for the failure? Could it be a timeout that you
> are experiencing?
>
> Fred
>
> "Charles A. Lackman" <Charles@CreateItSoftware.net> wrote in message
> news:OqlZ0o6DFHA.2572@tk2msftngp13.phx.gbl...
>> Hello,
>>
>> I am working on an updater that Retrieves a file from a web page.
>>
>>
>> GetRequest.Method = "POST"
>>
>> SW = New StreamWriter(TheRequest.GetRequestStream)
>> SW.WriteLine(TransferName)
>> SW.Close()
>> TheResponse = TheRequest.GetResponse()
>> ms = New MemoryStream()
>> CopyData(TheResponse.GetResponseStream(), ms)
>> ms.Seek(0, SeekOrigin.Begin)
>> System.IO.Directory.CreateDirectory(TransferFolder)
>> Dim st As FileStream = New FileStream(CompleteName, FileMode.Create)
>> ms.WriteTo(st)
>> st.Close()
>> ms.Close()
>>
>> The application works good about 90% of the time I have noticed that when
>> the file is really big like 25 Megs, it stops sending at about 16 Megs.
> Is
>> this because the computer does not have enough memory to store the
> complete
>> file? or could it be something with the web page that is responding to
>> the
>> request? or could it be something else.
>>
>> Any suggestions will be greatly appreciated and even modifications to my
>> code above. I am not sure how to make the memory stream write to the
>> file
>> every Meg to test the theory.
>>
>> Thanks,
>> Chuck
>>
>>
>
>

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