Pascal (Lazarus/Delphi)

Download Web Page to MHT and Extract Images (all in memory)

See more MHT / HTML Email Examples

Downloads a web page to an MHT archive (in memory) and then extracts each image to a byte array in memory. 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.StringBuilder,
  Chilkat.Email,
  Chilkat.Mht;

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

procedure RunDemo;
var
  success: Boolean;
  url: string;
  mht: TMht;
  mhtStr: string;
  email: TEmail;
  numRelatedItems: Integer;
  i: Integer;
  sbContentType: TStringBuilder;
  imageData: TBytes;

begin
  success := False;

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

  //  Note: This URL exists at the time of writing and testing this example (on 12-June-2020)
  //  However, it will surely not continue to exist for very long.
  //  You should choose a different URL.  (Any web page with images will do.)
  url := 'https://www.fendi.com/it/abbigliamento-uomo/cravatta-fxc160a3nwf0qg2';

  mht := TMht.Create;

  //  Downloads to an MHT string.
  //  MHT is just MIME, which is the same format as an email but with different semantics.
  mhtStr := mht.GetMHT(url);
  if (mht.LastMethodSuccess = False) then
    begin
      WriteLn(mht.LastErrorText);
      Exit;
    end;

  //  We can still treat the MHT MIME as an email and iterate over the "related items".
  email := TEmail.Create;
  success := email.SetFromMimeText(mhtStr);
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  numRelatedItems := email.NumRelatedItems;
  i := 0;
  sbContentType := TStringBuilder.Create;
  while i < numRelatedItems do
    begin
      sbContentType.SetString(email.GetRelatedContentType(i));
      WriteLn('Content-Type: ' + sbContentType.GetAsString());

      if (sbContentType.StartsWith('image/',False) = True) then
        begin
          //  We have an image.
          //  Get the image data.
          imageData := email.GetRelatedData(i);

          //  Do what you need with the image data..
        end;
      i := i + 1;
    end;



  mht.Free;
  email.Free;
  sbContentType.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.