problem with compress files

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problem with compress file
this code
to compress but first problem here: I cant save with file Extension
I change to zip there is no way to compress with original Extension if doc or other

C#

private void button1_Click_1(object sender, EventArgs e)
{
     OpenFileDialog op = new OpenFileDialog();
     op.ShowDialog();
     string filename = op.FileName;//@"c:\good";// //Program.x;
     SaveFileDialog sv=new SaveFileDialog ();
     sv.ShowDialog ();
     string savefile=sv.FileName ;
     FileStream infile = File.OpenRead(filename);
     byte[] buffer = new byte[infile.Length];
     infile.Read(buffer, 0, buffer.Length);
     infile.Close();
     FileStream outfile = File.Create(Path.ChangeExtension(savefile , "zip"));
     // FileStream outfile = File.Create(savefile +".zip");
               
     GZipStream gzipStream = new GZipStream(outfile, CompressionMode.Compress, true);
     // gzipStream.CanTimeout = true;
     MessageBox.Show(gzipStream.CanTimeout.ToString());
     gzipStream.Write(buffer, 0, buffer.Length);
     gzipStream.Close();
     progressBar1.Value = 100;

second problem when decompress

private void but_Decompress_Click(object sender, EventArgs e)
{
     OpenFileDialog op = new OpenFileDialog();
     op.ShowDialog();
     string filename = op.FileName;//@"c:\good";// //Program.x;
     SaveFileDialog sv = new SaveFileDialog();
     sv.ShowDialog();
     string savefile = sv.FileName;
     // string filename = Server.MapPath("TextFile.zip"); 
     FileStream infile = File.OpenRead(filename);
     DeflateStream deflateStream = new DeflateStream(infile, CompressionMode.Decompress);
     byte[] buffer = new byte[infile.Length + 100];
     int offset = 0;
     int totalCount = 0;
     while (true) 
     { 
           int bytesRead = deflateStream.Read(buffer, offset, 100);
           if (bytesRead == 0) { break; }
           offset += bytesRead; 
           totalCount += bytesRead;
     }
     FileStream outfile = File.Create(Path.ChangeExtension(savefile , "Doc"));
     outfile.Write(buffer, 0, buffer.Length);
     outfile.Close();
}

this error

Block length does not match with its complement

and I try with change

C#

int bytesRead = deflateStream.Read(buffer, offset, 100);

to

C#

int bytesRead = deflateStream.Read(buffer, offset, buffer.Length );

I still have this error
please any help
and thanks for any help

[Modified: added pre tags...they make the world a prettier place! Also fixed the tabbing and got rid of the textspeak.]

Posted 26-Jan-11 12:37pm

Mostafa Elsadany

Updated 26-Jan-11 12:48pm

William Winner

v2

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**JF2015** · Accepted Answer · 2011-01-26T18:36:00

Hi,

I've tested your code and I changed the following to make it work for me:
When compressing you can set the Filter of the SaveFileDialog to "zip" instead of changing the extension afterwards:

C#

OpenFileDialog op = new OpenFileDialog();
op.ShowDialog();
string filename = op.FileName;//@"c:\good";// //Program.x;
SaveFileDialog sv = new SaveFileDialog();
sv.Filter = "Zip files|*.zip";
sv.ShowDialog();
string savefile = sv.FileName;
FileStream infile = File.OpenRead(filename);
byte[] buffer = new byte[infile.Length];
infile.Read(buffer, 0, buffer.Length);
infile.Close();
FileStream outfile = File.Create(savefile);

GZipStream gzipStream = new GZipStream(outfile, CompressionMode.Compress, false);
gzipStream.Write(buffer, 0, buffer.Length);
gzipStream.Close();
gzipStream.Dispose();

When decompressing you need to change "DeflateStream" to "GZipStream". So instead of

C#

DeflateStream deflateStream = new DeflateStream(infile, CompressionMode.Decompress);

just use:

C#

GZipStream deflateStream = new GZipStream(infile, CompressionMode.Decompress);

shakil0304003 · Accepted Answer · 2011-01-26T18:09:00

Solution 1

You should see this link
Click
Please, read the "compressing multiple files with GZipStream" topic from this link.

Posted 26-Jan-11 18:09pm

shakil0304003

Comments

Mostafa Elsadany 27-Jan-11 14:35pm

thanks for help