Pascal (Lazarus/Delphi)

Download a Zip from a URL and OpenBd. (No .zip file is created)

See more Zip Examples

Demonstrates how to download a .zip from a URL, opens the Zip, and gets the contents of a file. No file is ever written. 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.Http,
  Chilkat.BinData,
  Chilkat.StringBuilder,
  Chilkat.ZipEntry,
  Chilkat.Zip;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  bd: TBinData;
  zip: TZip;
  entry: TZipEntry;
  lineEndingBehavior: Integer;
  xmlStr: string;
  sb: TStringBuilder;

begin
  success := False;

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

  http := THttp.Create;

  bd := TBinData.Create;

  //  This URL is valid and can be tested...
  success := http.QuickGetBd('https://chilkatdownload.com/example_data/hamlet.zip',bd);
  if (http.LastMethodSuccess = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  zip := TZip.Create;

  //  Open the zip from the bytes contained in bd.
  success := zip.OpenBd(bd);
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Get the entry for the file we want..
  entry := TZipEntry.Create;
  success := zip.EntryOf('hamlet.xml',entry);
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Convert all line endings to CRLF (if needed)
  lineEndingBehavior := 2;
  xmlStr := entry.UnzipToString(lineEndingBehavior,'utf-8');
  if (entry.LastMethodSuccess = False) then
    begin
      WriteLn(entry.LastErrorText);
      Exit;
    end;

  //  The XML in this case is about 274K, so let's just examine the last 20 lines...
  sb := TStringBuilder.Create;
  sb.Append(xmlStr);

  WriteLn(sb.LastNLines(20,True));


  http.Free;
  bd.Free;
  zip.Free;
  entry.Free;
  sb.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.