Delphi ActiveX

Check if a MIME Part is HTML

Demonstrates the Chilkat Mime.IsHtml method, which returns whether the Content-Type is exactly text/html. It takes no arguments and applies to the current part.

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: Finding the HTML part is the common goal when rendering a message richly — it is the formatted version a mail client prefers. In a multipart/alternative you would locate it with this predicate and fall back to the plain-text part when it is absent.

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var
success: Integer;
mime: TChilkatMime;
n: Integer;
part: TChilkatMime;
i: Integer;

begin
success := 0;

//  Demonstrates the Mime.IsHtml method, which returns whether the Content-Type is text/html.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

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

n := mime.NumParts;
part := TChilkatMime.Create(Self);

for i := 0 to n - 1 do
  begin
    success := mime.PartAt(i,part.ControlInterface);
    if (success = 0) then
      begin
        Memo1.Lines.Add(mime.LastErrorText);
        Exit;
      end;
    if (part.IsHtml()) then
      begin
        Memo1.Lines.Add('Part ' + IntToStr(i) + ' (' + part.ContentType + ') is HTML.');
      end;
  end;