Delphi ActiveX

Check if a MIME Entity is Multipart

Demonstrates the Chilkat Mime.IsMultipart method, which returns whether the Content-Type begins with multipart/. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: The first question when processing a message is usually whether it is a single part or a container of parts, because that decides whether you read the body directly or iterate children. IsMultipart answers it for any of the multipart subtypes at once; use the more specific predicates when the exact subtype matters.

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var
success: Integer;
mime: TChilkatMime;

begin
success := 0;

//  Demonstrates the Mime.IsMultipart method, which returns whether the Content-Type begins with multipart/.  It takes no arguments.

mime := TChilkatMime.Create(Self);
success := mime.LoadMimeFile('qa_data/multipart_message.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(mime.LastErrorText);
    Exit;
  end;

if (mime.IsMultipart()) then
  begin
    Memo1.Lines.Add('This is a multipart entity.');
  end
else
  begin
    Memo1.Lines.Add('This is not a multipart entity.');
  end;