Visual FoxPro

GZip Create / Extract .gz File

See more Gzip Examples

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loGzip
LOCAL lcXmlStr

lnSuccess = 0

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

loGzip = CreateObject('Chilkat.Gzip')

* File-to-file GZip:
* Compress "hamlet.xml" to create "hamlet.xml.gz"
lnSuccess = loGzip.CompressFile("hamlet.xml","hamlet.xml.gz")
IF (lnSuccess = 0) THEN
    ? loGzip.LastErrorText
    RELEASE loGzip
    CANCEL
ENDIF

* File-to-file ungzip
* Decompress "hamlet.xml.gz" to create "hamletOut.xml"
lnSuccess = loGzip.UncompressFile("hamlet.xml.gz","hamletOut.xml")
IF (lnSuccess = 0) THEN
    ? loGzip.LastErrorText
    RELEASE loGzip
    CANCEL
ENDIF

* 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.

lcXmlStr = loGzip.UncompressFileToString("hamlet.xml.gz","utf-8")
IF (lnSuccess = 0) THEN
    ? loGzip.LastErrorText
    RELEASE loGzip
    CANCEL
ENDIF

? lcXmlStr

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

RELEASE loGzip