Delphi DLL

Check if a MIME Entity is multipart/alternative

Demonstrates the Chilkat Mime.IsMultipartAlternative method, which returns whether the Content-Type is exactly multipart/alternative. 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: Recognizing multipart/alternative matters because its children are the same content in different formats — you display one (usually the last renderable), not all of them. That is the opposite of multipart/mixed, where every child is shown.

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var
success: Boolean;
mime: HCkMime;

begin
success := False;

//  Demonstrates the Mime.IsMultipartAlternative method, which returns whether the Content-Type is multipart/alternative.  It takes no arguments.

mime := CkMime_Create();
success := CkMime_LoadMimeFile(mime,'qa_data/multipart_message.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

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

CkMime_Dispose(mime);