Pascal (Lazarus/Delphi)

Append Dir Tree to Existing Zip w/out Rewriting Entire Zip

See more Zip Examples

Demonstrates how to use the QuickAppend method to append a directory tree to an existing .zip archive. This method works by editing the existing .zip -- it does not rewrite or recompress the contents of the existing .zip. It is the fastest way to append additional files to a pre-existing large .zip archive. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Zip;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  zip: TZip;
  recurse: Boolean;

begin
  success := False;

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

  zip := TZip.Create;

  //  The NewZip method only initializes the Zip object -- it does
  //  not create or write a .zip file.
  success := zip.NewZip('notUsed.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Add a references to all files in a directory tree.
  //  Note: this does not read or compress the file contents --
  //  it simply adds file references to the zip object.
  recurse := True;
  success := zip.AppendFiles('c:/temp/abc123/*',recurse);
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Appends the contents of the zip object to the preExisting.zip
  //  zip archive.  preExisting.zip is opened, and the files
  //  referenced by this zip object are streamed in, compressed,
  //  and appended to the end of the archive.
  success := zip.QuickAppend('preExisting.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  WriteLn('Success!');

  //  Note: Additional files, directory trees, or in-memory data
  //  can be appended by calling AddFile, AppendFiles,
  //  AddString, AddBd, AddSb, etc. multiple times.
  //  Whatever files and/or in-memory data that are referenced by
  //  this zip object will be appended to preExisting.zip when
  //  QuickAppend is called.


  zip.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.