[2005] SharpZipLibrary Help

[Vaughands]

I've found this: http://www.componentspot.com/doccenter/SharpZipLib/
I've looked at what it supports and other things, but would anyone be so helpful to get me on the right tracks of extracting a file, it's for my Updater once again, everything is in PERFECT working order now, I just need to get the files in a ZIP file, delete them from the current directory and extract the ZIP ( or override the current files ). I'm stumped as how to do this though, where would I start?

[jmcilhinney]

I wrote a wrapper for #ZipLib many months ago in VB.NET 2003. I believe they've made some improvements since then but the old code may still work as is. If not it will at least give you a very good starting point to write your own code. Apparently some people had some issues extracting files under certain circumstances but I never did get around to looking at the issue. Like I said, it's a very good starting point if nothing else.

http://www.vbforums.com/showthread.php?t=360169

[.paul.]

unzip using sharpziplib

        
        dim extractDir as string = "c:\program files\unzip\"

        ' Using 
        Dim s As ZipInputStream = New ZipInputStream(File.OpenRead(zipfile path))

        Try
            Dim entry As ZipEntry = s.GetNextEntry
            While Not entry Is Nothing

                Dim directoryName As String = Path.GetDirectoryName(extractDir & entry.Name)

                Dim fileName As String = Path.GetFileName(extractDir & entry.Name)
                If directoryName.Length > 0 Then
                    Directory.CreateDirectory(directoryName)
                End If
                If Not (fileName = String.Empty) Then
                    ' Using 
                    Dim streamWriter As FileStream = File.Create(extractDir & entry.Name)
                    Try

                        Dim size As Long = entry.Size
                        Dim data(size - 1) As Byte
                        Dim tgl As Boolean = True

                        While tgl = True
                            size = s.Read(data, 0, data.Length)
                            If size > 0 Then
                                streamWriter.Write(data, 0, size)
                                tgl = False
                            Else
                                ' break 
                                tgl = False
                            End If

                        End While

                    Finally
                        CType(streamWriter, IDisposable).Dispose()
                    End Try
                End If
                entry = s.GetNextEntry
            End While
        Finally
            CType(s, IDisposable).Dispose()
        End Try

[ediguy]

I just installed SharpZipLib today and tried to execute this code on a .gz file and I get an error that says:

Wrong Local header signature: 0x88B1F

I can open up the file with WinZip no problem. Any ideas why this would be happening?

Thanks in advance!

[Negative0]

What type of compression is used by the GZ file? Winzip supports more compression formats than does SharpZipLib, so just because you can open it in winzip does not mean SharpZipLib can open it.

[jmcilhinney]

A GZ file is a GZIP file, not a ZIP file. They are two different compression formats. Did you tell #ZipLib that it was a GZIP file when you tried to extract it or did you just treat it like a ZIP file?