Pascal (Lazarus/Delphi)
Build a multipart/related MIME Message

Demonstrates how to construct a multipart/related MIME message containing HTML and a related JPG image.
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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.Mime,
  Chilkat.StringBuilder,
  Chilkat.FileAccess,
  Chilkat.Crypt2;

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

procedure RunDemo;
var
  success: Boolean;
  mime: TMime;
  crypt: TCrypt2;
  sbContentId: TStringBuilder;
  sbHtml: TStringBuilder;
  numReplacements: Integer;
  htmlMime: TMime;
  fac: TFileAccess;
  jpgBytes: TBytes;
  jpgMime: TMime;
  sbContentIdHdr: TStringBuilder;

begin
  success := False;

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

  //  Start with an empty MIME object...
  mime := TMime.Create;

  //  Initialize it as multipart/related.
  mime.NewMultipartRelated();

  //  Set a top-level MIME header field.
  mime.SetHeaderField('Subject','Test HTML email with JPG image.');

  //  Generate a Content-ID.  This will contain random data that will allow
  //  the HTML's "img" tag to reference the image part in the MIME.
  crypt := TCrypt2.Create;
  crypt.EncodingMode := 'hex';

  sbContentId := TStringBuilder.Create;
  sbContentId.Append('part1.');
  sbContentId.Append(crypt.GenRandomBytesENC(4));
  sbContentId.Append('.');
  sbContentId.Append(crypt.GenRandomBytesENC(4));
  sbContentId.Append('@chilkatsoft.com');

  //  Create the HTML body.
  sbHtml := TStringBuilder.Create;
  sbHtml.Append('<html><head>' + #13#10);
  sbHtml.Append('<meta http-equiv="Content-Type" content="text/html; charset=utf-8">' + #13#10);
  sbHtml.Append('  </head>' + #13#10);
  sbHtml.Append('  <body bgcolor="#FFFFFF" text="#000000">' + #13#10);
  sbHtml.Append('    <p>This is a test.&nbsp; <img src="cid:CONTENT_ID" height="20" width="20"></p>' + #13#10);
  sbHtml.Append('  </body>' + #13#10);
  sbHtml.Append('</html>' + #13#10);
  numReplacements := sbHtml.Replace('CONTENT_ID',sbContentId.GetAsString());

  //  Create the HTML MIME part.
  htmlMime := TMime.Create;
  htmlMime.SetBodyFromHtml(sbHtml.GetAsString());
  htmlMime.Encoding := '8bit';
  htmlMime.Charset := 'utf-8';

  //  Load our JPG image from a file.
  fac := TFileAccess.Create;

  jpgBytes := fac.ReadEntireFile('qa_data/jpg/starfish20.jpg');

  //  Create an image/jpeg MIME part.
  jpgMime := TMime.Create;
  jpgMime.SetBodyFromBinary(jpgBytes);
  //  Setting the following properties has the effect of adding
  //  the Content-Type, Content-Transfer-Encoding, and Content-Disposition header fields.
  //  These header fields could also be set via the SetHeaderField method, in which case
  //  the values of the affected properties would be updated.
  jpgMime.ContentType := 'image/jpeg';
  jpgMime.Name := 'starfish20.jpg';
  jpgMime.Encoding := 'base64';
  jpgMime.Disposition := 'inline';
  jpgMime.Filename := 'starfish20.jpg';

  sbContentIdHdr := TStringBuilder.Create;
  sbContentIdHdr.Append('<CONTENT_ID>');
  numReplacements := sbContentIdHdr.Replace('CONTENT_ID',sbContentId.GetAsString());
  jpgMime.SetHeaderField('Content-ID',sbContentIdHdr.GetAsString());

  //  Add both parts as children of the multipart/related
  mime.AppendPart(htmlMime);
  mime.AppendPart(jpgMime);
  WriteLn(mime.GetMime());

  //  --------------------------------------------------------------
  //  --------------------------------------------------------------
  //  This example builds the following MIME message.  The boundary
  //  and Content-ID strings contain random data and will be different.  

  //  Content-Type: multipart/related; boundary="------------A940F1230E6F0105F03DB2CB"
  //  Subject: Test HTML email with JPG image.
  //  
  //  --------------A940F1230E6F0105F03DB2CB
  //  Content-Type: text/html; charset="utf-8"
  //  Content-Transfer-Encoding: 8bit
  //  
  //  <html><head>
  //  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  //    </head>
  //    <body bgcolor="#FFFFFF" text="#000000">
  //      <p>This is a test.&nbsp; <img src="cid:part1.E16AE3B4.1505C436@chilkatsoft.com" height="20" width="20"></p>
  //    </body>
  //  </html>
  //  
  //  --------------A940F1230E6F0105F03DB2CB
  //  Content-Transfer-Encoding: base64
  //  Content-Type: image/jpeg; name="starfish20.jpg"
  //  Content-Disposition: inline; filename="starfish20.jpg"
  //  Content-ID: <part1.E16AE3B4.1505C436@chilkatsoft.com>
  //  
  //  /9j/4AAQSkZJRgABAQEASABIAAD//gAmRmlsZSB3cml0dGVuIGJ5IEFkb2JlIFBob3Rvc2hvcD8g
  //  NC4w/9sAQwAQCwwODAoQDg0OEhEQExgoGhgWFhgxIyUdKDozPTw5Mzg3QEhcTkBEV0U3OFBtUVdf
  //  YmdoZz5NcXlwZHhcZWdj/9sAQwEREhIYFRgvGhovY0I4QmNjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj
  //  Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2Nj/8IAEQgAFAAUAwERAAIRAQMRAf/EABcAAAMBAAAA
  //  AAAAAAAAAAAAAAIDBAX/xAAYAQADAQEAAAAAAAAAAAAAAAABAgMEAP/aAAwDAQACEAMQAAAB2kZY
  //  NNEijWKddfTmLgALWH//xAAbEAACAgMBAAAAAAAAAAAAAAABAgMRAAQSE//aAAgBAQABBQL0XqN+
  //  pM2aqJGMiqFFCyg7z//EABwRAAICAgMAAAAAAAAAAAAAAAERAAIQIQMSUf/aAAgBAwEBPwHqU5aq
  //  Axx+y1tMQl4elj//xAAcEQEAAQUBAQAAAAAAAAAAAAABEQACEBIhA1H/2gAIAQIBAT8B3Bhqy7Zc
  //  enyiwmGgDhiOzj//xAAdEAABAwUBAAAAAAAAAAAAAAABAAIREBIhIkFR/9oACAEBAAY/ArZyn+Cg
  //  xtxWuJaoCnqDuin/xAAcEAABBAMBAAAAAAAAAAAAAAABABEhYRAxQVH/2gAIAQEAAT8hkEwPUUR9
  //  DYfE4nxtRpIkBTsayuALIiuY/9oADAMBAAIAAwAAABDWPTsf/8QAGhEAAwADAQAAAAAAAAAAAAAA
  //  AAEREDFBIf/aAAgBAwEBPxC0DVPcWm+Ce4OesrkE6bjH/8QAGBEBAQEBAQAAAAAAAAAAAAAAAREA
  //  QRD/2gAIAQIBAT8QahMiOc8YgSrnTY3ELclHXn//xAAcEAEBAAIDAQEAAAAAAAAAAAABEQAhMUFx
  //  EFH/2gAIAQEAAT8Qn3igmSZSj+c4N4zapMy9IjFV98wncN2iuLFsCEbDGxQkI6RO/n//2Q==
  //  
  //  --------------A940F1230E6F0105F03DB2CB--
  //  


  mime.Free;
  crypt.Free;
  sbContentId.Free;
  sbHtml.Free;
  htmlMime.Free;
  fac.Free;
  jpgMime.Free;
  sbContentIdHdr.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.