(Delphi DLL) Build a multipart/related MIME Message

Demonstrates how to construct a multipart/related MIME message containing HTML and a related JPG image.

Chilkat for Delphi Downloads

Chilkat non-ActiveX DLL for Delphi

Chilkat ActiveX DLL for Delphi

* The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Mime, StringBuilder, CkByteData, FileAccess, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
mime: HCkMime;
crypt: HCkCrypt2;
sbContentId: HCkStringBuilder;
sbHtml: HCkStringBuilder;
numReplacements: Integer;
htmlMime: HCkMime;
fac: HCkFileAccess;
jpgBytes: HCkByteData;
jpgMime: HCkMime;
sbContentIdHdr: HCkStringBuilder;

begin
// 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 := CkMime_Create();

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

// Set a top-level MIME header field.
CkMime_SetHeaderField(mime,'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 := CkCrypt2_Create();
CkCrypt2_putEncodingMode(crypt,'hex');

sbContentId := CkStringBuilder_Create();
CkStringBuilder_Append(sbContentId,'part1.');
CkStringBuilder_Append(sbContentId,CkCrypt2__genRandomBytesENC(crypt,4));
CkStringBuilder_Append(sbContentId,'.');
CkStringBuilder_Append(sbContentId,CkCrypt2__genRandomBytesENC(crypt,4));
CkStringBuilder_Append(sbContentId,'@chilkatsoft.com');

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

// Create the HTML MIME part.
htmlMime := CkMime_Create();
CkMime_SetBodyFromHtml(htmlMime,CkStringBuilder__getAsString(sbHtml));
CkMime_putEncoding(htmlMime,'8bit');
CkMime_putCharset(htmlMime,'utf-8');

// Load our JPG image from a file.
fac := CkFileAccess_Create();
jpgBytes := CkByteData_Create();
success := CkFileAccess_ReadEntireFile(fac,'qa_data/jpg/starfish20.jpg',jpgBytes);

// Create an image/jpeg MIME part.
jpgMime := CkMime_Create();
CkMime_SetBodyFromBinary(jpgMime,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.
CkMime_putContentType(jpgMime,'image/jpeg');
CkMime_putName(jpgMime,'starfish20.jpg');
CkMime_putEncoding(jpgMime,'base64');
CkMime_putDisposition(jpgMime,'inline');
CkMime_putFilename(jpgMime,'starfish20.jpg');

sbContentIdHdr := CkStringBuilder_Create();
CkStringBuilder_Append(sbContentIdHdr,'<CONTENT_ID>');
numReplacements := CkStringBuilder_Replace(sbContentIdHdr,'CONTENT_ID',CkStringBuilder__getAsString(sbContentId));
CkMime_SetHeaderField(jpgMime,'Content-ID',CkStringBuilder__getAsString(sbContentIdHdr));

// Add both parts as children of the multipart/related
CkMime_AppendPart(mime,htmlMime);
CkMime_AppendPart(mime,jpgMime);
Memo1.Lines.Add(CkMime__getMime(mime));

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

CkMime_Dispose(mime);
CkCrypt2_Dispose(crypt);
CkStringBuilder_Dispose(sbContentId);
CkStringBuilder_Dispose(sbHtml);
CkMime_Dispose(htmlMime);
CkFileAccess_Dispose(fac);
CkByteData_Dispose(jpgBytes);
CkMime_Dispose(jpgMime);
CkStringBuilder_Dispose(sbContentIdHdr);

end;