GZip Create .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.

Download: Chilkat .NET Assemblies

Dim gzip As New Chilkat.Gzip()

Dim success As Boolean

'  Any string unlocks the component for the 1st 30-days.
success = gzip.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox(gzip.LastErrorText)
    Exit Sub
End If


'  File-to-file GZip:
'  Compress "hamlet.xml" to create "hamlet.xml.gz"
success = gzip.CompressFile("hamlet.xml","hamlet.xml.gz")
If (success <> true) Then
    MsgBox(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
    MsgBox(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
    MsgBox(gzip.LastErrorText)
    Exit Sub
End If

TextBox1.Text = TextBox1.Text & xmlStr & vbCrLf


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