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C#.NET - Problems with stream read/write timing glitches

Posted on 2004-08-19
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Last Modified: 2010-08-05
I'm trying to read from a Stream and write to another Stream. The output stream is a disk file, whereas the input stream is one provided by SharpZip (http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx).

I've put a BinaryReader on the SharpZip Stream and a BinaryWriter on the disk file's handle.

Whenever the stream data is copied I run into glitches that result in truncated files, 0-byte files, files that are closed before they've started to be written, etc. In general it appears that BinaryWriter is executing in a different, slower thread than the read operations. However, I haven't put any multithreading code into my app.

Here is applicable code:
                      Outfile = new FileStream((UT2004Location + en.Value.ToString()), ((bOverwrite) ? (FileMode.Create) : (FileMode.CreateNew)), FileAccess.Write);
                      Output = new BinaryWriter(Outfile);
                      // Read in data
                      Instream = Infile.GetInputStream(Infile.GetEntry(en.Key.ToString()));
                      Input = new BinaryReader(Instream);
                      Size = 2048;
                      while (true)
                      {
                          Size = Input.Read(Buffer, 0, Buffer.Length);
                          if (Size > 0)
                          {
                              Output.Write(Buffer);
                          }
                          else
                          {
                              break;
                          }
                      }
                    Input.Close();
                    Instream.Close();
                    Output.Close();
                    Outfile.Close();

Thanks in advance,

mtyrce
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Question by:mtyrce
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7 Comments
 
LVL 25

Expert Comment

by:apeter
ID: 11850794
Hi,
   Maybe SharpZip is doing some multi threading..check it out is functionality

-Aaron
0
 
LVL 15

Expert Comment

by:ozymandias
ID: 11851140
When you wroite to your BinaryStream, try doing this :

        Output.Write(Buffer,0,Size);

instead of this :

        Output.Write(Buffer);

0
 

Author Comment

by:mtyrce
ID: 11854166
Thanks for the tips everyone,

I figured it out. It looks like it was two things:

1. I didn't Output.Flush() before Output.Close(), and
2. I shouldn't have had Input.Close() and Instream.Close() (those gave me errors that the next file could not be read since it was already closed.)

Sorry for wasting everyone's time, I'm a .NET newbie. :(

Going to request a refund in Community Service.
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LVL 15

Expert Comment

by:ozymandias
ID: 11855422
I have no problem with that.
However, I would still recommend the change I suggested.

Cheers.
0
 

Author Comment

by:mtyrce
ID: 11866379
ozymanidias, that was what the line was before; I messed with it during debugging attempts. I'll change it back if it's better for some reason.
0
 
LVL 2

Accepted Solution

by:
Lunchy earned 0 total points
ID: 11885957
Closed, 400 points refunded.
Lunchy
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