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 32-bit Zip ActiveX (.msi) (includes objects for .zip, .gz, .bz2, and .Z)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATGZIPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
gzip: TGzip;
success: Integer;
xmlStr: String;

begin

gzip := TGzip.Create(Self);

//  Any string unlocks the component for the 1st 30-days.
success := gzip.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(gzip.LastErrorText);
    Exit;
  end;

//  File-to-file GZip:
//  Compress "hamlet.xml" to create "hamlet.xml.gz"
success := gzip.CompressFile('hamlet.xml','hamlet.xml.gz');
if (success <> 1) then
  begin
    ShowMessage(gzip.LastErrorText);
    Exit;
  end;

//  File-to-file ungzip
//  Decompress "hamlet.xml.gz" to create "hamletOut.xml"
success := gzip.UncompressFile('hamlet.xml.gz','hamletOut.xml');
if (success <> 1) then
  begin
    ShowMessage(gzip.LastErrorText);
    Exit;
  end;

//  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.

xmlStr := gzip.UncompressFileToString('hamlet.xml.gz','utf-8');
if (success <> 1) then
  begin
    ShowMessage(gzip.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(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.


end;