Delphi ActiveX

Add a Related String Resource to an Email

Demonstrates the Chilkat Email.AddRelatedString method, which adds a text-based related MIME resource, such as a style sheet, from an in-memory string and returns the generated Content-ID. The first argument is the MIME resource name, the second is the text content, and the third is the charset used to encode it. Because the Content-ID is generated by the call, this example adds the style sheet first, then builds an HTML body in a StringBuilder that references the style sheet by that cid:, and passes the result to SetHtmlBody.

Background: Related items are not always images loaded from disk — sometimes the resource is text you already have in memory, like a generated CSS style sheet or an SVG. AddRelatedString lets you embed such content directly without writing a temporary file first. As with other related items, it lives in the multipart/related enclosure and is referenced from the HTML by the Content-ID the method returns.

Chilkat Delphi ActiveX Downloads

Download Chilkat for Delphi ActiveX

Delphi ActiveX

var
email: TChilkatEmail;
cid: WideString;
sbHtml: TChilkatStringBuilder;
numReplaced: Integer;

begin
//  Demonstrates the AddRelatedString method, which adds a text-based related MIME resource
//  (such as a style sheet) from an in-memory string and returns the generated Content-ID.
//  The first argument is the resource name, the second is the text content, the third is the charset.

email := TChilkatEmail.Create(Self);
email.Subject := 'Email with a related style sheet';

//  Add the text-based related resource first; capture the generated Content-ID.
cid := email.AddRelatedString('styles.css','body { color: navy; }','utf-8');
if (email.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

//  Build the HTML body, referencing the related style sheet by its Content-ID.  A
//  placeholder is used and then replaced with the actual Content-ID.
sbHtml := TChilkatStringBuilder.Create(Self);
sbHtml.Append('<html><head><link rel="stylesheet" href="cid:PLACEHOLDER_CID"/></head><body>Styled content.</body></html>');
numReplaced := sbHtml.Replace('PLACEHOLDER_CID',cid);
email.SetHtmlBody(sbHtml.GetAsString());

Memo1.Lines.Add('Related Content-ID = ' + cid);
Memo1.Lines.Add('NumRelatedItems = ' + IntToStr(email.NumRelatedItems));