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Delphi DLL Examples

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(Delphi DLL) 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.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Gzip;

...

procedure TForm1.Button1Click(Sender: TObject);
var
gzip: HCkGzip;
success: Boolean;
xmlStr: PWideChar;

begin
gzip := CkGzip_Create();

//  Any string unlocks the component for the 1st 30-days.
success := CkGzip_UnlockComponent(gzip,'Anything for 30-day trial');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGzip__lastErrorText(gzip));
    Exit;
  end;

//  File-to-file GZip:
//  Compress "hamlet.xml" to create "hamlet.xml.gz";
success := CkGzip_CompressFile(gzip,'hamlet.xml','hamlet.xml.gz');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGzip__lastErrorText(gzip));
    Exit;
  end;

//  File-to-file ungzip
//  Decompress "hamlet.xml.gz" to create "hamletOut.xml";
success := CkGzip_UncompressFile(gzip,'hamlet.xml.gz','hamletOut.xml');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGzip__lastErrorText(gzip));
    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 := CkGzip__uncompressFileToString(gzip,'hamlet.xml.gz','utf-8');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGzip__lastErrorText(gzip));
    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.

CkGzip_Dispose(gzip);

end;

 

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