Delphi ActiveX

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

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var
success: Integer;
mime: TChilkatMime;
textPart: TChilkatMime;
htmlPart: TChilkatMime;

begin
success := 0;

//  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
//  multipart/alternative entity, clearing any existing content.  It takes no arguments.

mime := TChilkatMime.Create(Self);

success := mime.NewMultipartAlternative();
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

//  multipart/alternative holds two representations of the SAME content; the client displays the
//  last one it can render.  Add a plain-text part, then an HTML part.
textPart := TChilkatMime.Create(Self);
success := textPart.SetBodyFromPlainText('Hello (plain text version).');
if (success = 0) then
  begin
    Memo1.Lines.Add(textPart.LastErrorText);
    Exit;
  end;
success := mime.AppendPart(textPart.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

htmlPart := TChilkatMime.Create(Self);
success := htmlPart.SetBodyFromHtml('<html><body><b>Hello</b> (HTML version).</body></html>');
if (success = 0) then
  begin
    Memo1.Lines.Add(htmlPart.LastErrorText);
    Exit;
  end;
success := mime.AppendPart(htmlPart.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Number of alternatives: ' + IntToStr(mime.NumParts));