Lazarus Pascal

Example: Http.ResumeDownload method

Demonstrates the ResumeDownload method. Lazarus Pascal

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.FileAccess,
  Chilkat.Http;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  localFilePath: string;
  statusCode: Integer;
  fac: TFileAccess;

begin
  success := False;

  http := THttp.Create;
  http.KeepResponseBody := True;

  //  To demonstrate resuming a download, we've created a file on the chilkatsoft.com
  //  web server that contains the first 82,379 bytes of the full  279,658 bytes of the hamlet.xml file.

  //  We'll first download the partial file, and pretend it was a previous incomplete attempt to download the entire file.
  localFilePath := 'c:/temp/qa_output/hamlet.xml';
  success := http.Download('https://www.chilkatsoft.com/testData/hamlet_partial.xml',localFilePath);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Download the remainder of hamlet.xml.
  success := http.ResumeDownload('https://www.chilkatsoft.com/testData/hamlet.xml',localFilePath);
  statusCode := http.LastStatus;
  if (success = False) then
    begin
      if (statusCode = 0) then
        begin
          //  Unable to either send the request or get the response.
          WriteLn(http.LastErrorText);
        end
      else
        begin
          //  We got a response, but the status code was not in the 200s
          WriteLn('Response status code: ' + statusCode);
          //  Examine the response body.
          WriteLn('Response body:');
          WriteLn(http.LastResponseBody);
        end;
      WriteLn('Download failed.');

    end
  else
    begin
      WriteLn('Download success, response status = ' + statusCode);
    end;

  //  The hamlet.xml file should be 279,658 bytes
  fac := TFileAccess.Create;
  WriteLn('size of hamlet.xml: ' + fac.FileSize(localFilePath));

  WriteLn('Success.');


  http.Free;
  fac.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.