Pascal (Lazarus/Delphi)

Replace/Update a FIle in a .zip

See more Zip Examples

Demonstrates how to replace/update a file from a .zip. Note: This requires the entire .zip to be rewritten. 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.ZipEntry,
  Chilkat.Zip;

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

procedure RunDemo;
var
  success: Boolean;
  zip: TZip;
  charset: string;
  zip2: TZip;
  entry: TZipEntry;

begin
  success := False;

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

  //  First prepare a .zip and write it..
  zip := TZip.Create;

  zip.NewZip('qa_output/abc.zip');

  //  Add some files..
  charset := 'utf-8';
  zip.AddString('a.txt','aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',charset);
  zip.AddString('b.txt','bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb',charset);
  zip.AddString('c.txt','cccccccccccccccccccccccccccccccccccc',charset);

  //  Write to qa_output/abc.zip
  //  This .zip contains three files: a.txt, b.txt, and c.txt
  success := zip.WriteZipAndClose();

  //  -------------------------------------------------------------------
  //  Open abc.zip, replace the content of the "b.txt" entry with something else, and re-write.
  zip2 := TZip.Create;
  zip2.OpenZip('qa_output/abc.zip');

  entry := TZipEntry.Create;
  if (zip2.EntryOf('b.txt',entry) = True) then
    begin
      entry.ReplaceString('This is the new content.  bbbbbbbbbbbbbbbbbbbbbb','utf-8');
    end;

  //  Write the modified .zip back to "abc.zip"
  success := zip2.WriteZipAndClose();

  WriteLn('success.');


  zip.Free;
  zip2.Free;
  entry.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.