(VB.NET) GZip Create / Extract .gz File

Demonstrates how to compress a file to create a .gz (GZip) file.

Note: The .gz file format is a compressed file format. It contains a single file. The .gz file format is not an archive format (i.e. it does not contain a collection of files/directories such as with the .zip, .rar, or .tar file formats). GZip is often combined with TAR to create a .tgz (or .tar.gz).

Note: It is possible for a .gz to contain more than one file, but this is very uncommon.

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' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim gzip As New Chilkat.Gzip

' File-to-file GZip:
' Compress "hamlet.xml" to create "hamlet.xml.gz"
Dim success As Boolean = gzip.CompressFile("hamlet.xml","hamlet.xml.gz")
If (success <> True) Then
    Debug.WriteLine(gzip.LastErrorText)
    Exit Sub
End If


' File-to-file ungzip
' Decompress "hamlet.xml.gz" to create "hamletOut.xml"
success = gzip.UncompressFile("hamlet.xml.gz","hamletOut.xml")
If (success <> True) Then
    Debug.WriteLine(gzip.LastErrorText)
    Exit Sub
End If


' File-to-string ungzip
' Decompress the contents of a .gz directly to a string variable:
' The 2nd argument indicates the charset of the character
' data after it is decompressed.
Dim xmlStr As String
xmlStr = gzip.UncompressFileToString("hamlet.xml.gz","utf-8")
If (success <> True) Then
    Debug.WriteLine(gzip.LastErrorText)
    Exit Sub
End If

Debug.WriteLine(xmlStr)


' The Chilkat GZip API provides much more flexibility than shown
' here.  See the reference documentation at 
' http://www.chilkatsoft.com/refdoc for more information