"7elephants" <7elepha***@gmail.com> wrote in message
news:1150986524.781267.15750@g10g2000cwb.googlegroups.com...
>I have written a class to do compression/decompression using
> System.IO.Compression.GZipStream.  The compression seems to work fine,
> but when I try and decompress a compressed string, nothing is returned
> in the buffer...To do the processing, I pass the GZipStream as input
> into the following function:
>
> private void ProcessStreams(Stream input, Stream output) {
>            int offset = 0;
>
>            try {
>                if (input.CanRead & output.CanWrite) {
>                    byte[] buffer = new byte[4096];
>
>                    //make sure stream is at the beginning
>                    if (input.CanSeek)
>                        input.Seek(0,SeekOrigin.Begin);
>
>                    while (true) {
>                        //read input stream
>                        int bytesRead = input.Read(buffer, 0,
> bufferSize);
>
>                        if (bytesRead > 0)
>                        {
>                            //write to output stream
>                            output.Write(buffer, offset, bytesRead);
>                            offset += bytesRead;
>                        } else {
>                            break;
>                        }
>                    }
>
>                    //flush write buffer
>                    output.Flush();
>                }
>            } catch (ArgumentNullException argEx) {
>                throw new CompressorException("Input stream is not
> valid", ExceptionLevel.Error, false, this.ToString(),
>                                              "GetCompressionOutput",
> argEx);
>            } catch (InvalidOperationException ioEx) {
>                throw new CompressorException("Input stream is
> read-only", ExceptionLevel.Error, false, this.ToString(),
>                                              "GetCompressionOutput",
> ioEx);
>            } catch (IOException ioEx) {
>                throw new CompressorException("Invalid I/O operation",
> ExceptionLevel.Error, false, this.ToString(),
>                                              "GetCompressionOutput",
> ioEx);
>            } catch (Exception ex) {
>                throw new CompressorException("Unspecified exception",
> ExceptionLevel.Error, false, this.ToString(),
>                                              "GetCompressionOutput",
> ex);
>            }
>
> +------------------------------------------------------------------------+
> I have read in doing research that the GZipStream doesn't return the
> bytes read when running GZipStream.Read (is this true?), so when I
> check the buffer, it is "empty".  The base stream of the GZipStream is
> a MemoryStream if that makes a difference.
>
> Any help would be great.  Thanks in advance.
>

"7elephants" <7elepha***@gmail.com> wrote in message
news:1150986524.781267.15750@g10g2000cwb.googlegroups.com...
> I have written a class to do compression/decompression using
> System.IO.Compression.GZipStream.  The compression seems to work fine,
> but when I try and decompress a compressed string, nothing is returned
> in the buffer...To do the processing, I pass the GZipStream as input
> into the following function:
>
> private void ProcessStreams(Stream input, Stream output) {
>             int offset = 0;
>
>             try {
>                 if (input.CanRead & output.CanWrite) {
>                     byte[] buffer = new byte[4096];
>
>                     //make sure stream is at the beginning
>                     if (input.CanSeek)
>                         input.Seek(0,SeekOrigin.Begin);
>
>                     while (true) {
>                         //read input stream
>                         int bytesRead = input.Read(buffer, 0,
> bufferSize);
>
>                         if (bytesRead > 0)
>                         {
>                             //write to output stream
>                             output.Write(buffer, offset, bytesRead);
>                             offset += bytesRead;
>                         } else {
>                             break;
>                         }
>                     }
>
>                     //flush write buffer
>                     output.Flush();
>                 }
>             } catch (ArgumentNullException argEx) {
>                 throw new CompressorException("Input stream is not
> valid", ExceptionLevel.Error, false, this.ToString(),
>                                               "GetCompressionOutput",
> argEx);
>             } catch (InvalidOperationException ioEx) {
>                 throw new CompressorException("Input stream is
> read-only", ExceptionLevel.Error, false, this.ToString(),
>                                               "GetCompressionOutput",
> ioEx);
>             } catch (IOException ioEx) {
>                 throw new CompressorException("Invalid I/O operation",
> ExceptionLevel.Error, false, this.ToString(),
>                                               "GetCompressionOutput",
> ioEx);
>             } catch (Exception ex) {
>                 throw new CompressorException("Unspecified exception",
> ExceptionLevel.Error, false, this.ToString(),
>                                               "GetCompressionOutput",
> ex);
>             }
>
> +------------------------------------------------------------------------+
> I have read in doing research that the GZipStream doesn't return the
> bytes read when running GZipStream.Read (is this true?), so when I
> check the buffer, it is "empty".  The base stream of the GZipStream is
> a MemoryStream if that makes a difference.
>
> Any help would be great.  Thanks in advance.
>
>

> What are you attempting to acutally do?  If it's reading and writing zip
> files, import java.util.zip.  You'll need a reference to "vjslib.dll" to use
> it.  A C# Zip example is at
> http://msdn.microsoft.com/msdnmag/issues/03/06/ZipCompression/#S8
>
> I use this library in a production application for our sales force.
>
> Mike Ober.
>
> "7elephants" <7elepha***@gmail.com> wrote in message
> news:1150986524.781267.15750@g10g2000cwb.googlegroups.com...
> > I have written a class to do compression/decompression using
> > System.IO.Compression.GZipStream.  The compression seems to work fine,
> > but when I try and decompress a compressed string, nothing is returned
> > in the buffer...To do the processing, I pass the GZipStream as input
> > into the following function:
> >
> > private void ProcessStreams(Stream input, Stream output) {
> >             int offset = 0;
> >
> >             try {
> >                 if (input.CanRead & output.CanWrite) {
> >                     byte[] buffer = new byte[4096];
> >
> >                     //make sure stream is at the beginning
> >                     if (input.CanSeek)
> >                         input.Seek(0,SeekOrigin.Begin);
> >
> >                     while (true) {
> >                         //read input stream
> >                         int bytesRead = input.Read(buffer, 0,
> > bufferSize);
> >
> >                         if (bytesRead > 0)
> >                         {
> >                             //write to output stream
> >                             output.Write(buffer, offset, bytesRead);
> >                             offset += bytesRead;
> >                         } else {
> >                             break;
> >                         }
> >                     }
> >
> >                     //flush write buffer
> >                     output.Flush();
> >                 }
> >             } catch (ArgumentNullException argEx) {
> >                 throw new CompressorException("Input stream is not
> > valid", ExceptionLevel.Error, false, this.ToString(),
> >                                               "GetCompressionOutput",
> > argEx);
> >             } catch (InvalidOperationException ioEx) {
> >                 throw new CompressorException("Input stream is
> > read-only", ExceptionLevel.Error, false, this.ToString(),
> >                                               "GetCompressionOutput",
> > ioEx);
> >             } catch (IOException ioEx) {
> >                 throw new CompressorException("Invalid I/O operation",
> > ExceptionLevel.Error, false, this.ToString(),
> >                                               "GetCompressionOutput",
> > ioEx);
> >             } catch (Exception ex) {
> >                 throw new CompressorException("Unspecified exception",
> > ExceptionLevel.Error, false, this.ToString(),
> >                                               "GetCompressionOutput",
> > ex);
> >             }
> >
> > +------------------------------------------------------------------------+
> > I have read in doing research that the GZipStream doesn't return the
> > bytes read when running GZipStream.Read (is this true?), so when I
> > check the buffer, it is "empty".  The base stream of the GZipStream is
> > a MemoryStream if that makes a difference.
> >
> > Any help would be great.  Thanks in advance.
> >
> >

> 7elephants <7elepha***@gmail.com> wrote:
> > I have written a class to do compression/decompression using
> > System.IO.Compression.GZipStream.  The compression seems to work fine,
> > but when I try and decompress a compressed string, nothing is returned
> > in the buffer...To do the processing, I pass the GZipStream as input
> > into the following function:
>
> Could you post a short but complete program which demonstrates the
> problem?
>
> See http://www.pobox.com/~skeet/csharp/complete.html for details of
> what I mean by that.
>
> --
> Jon Skeet - <sk***@pobox.com>
> http://www.pobox.com/~skeet   Blog: http://www.msmvps.com/jon.skeet
> If replying to the group, please do not mail me too