Delphi ActiveX

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

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

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

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

begin
success := 0;

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

//  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
//  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
//  the parent tree.
n := mime.NumParts;
Memo1.Lines.Add('Number of parts: ' + IntToStr(n));

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;
    Memo1.Lines.Add('Part ' + IntToStr(i) + ' Content-Type: ' + part.ContentType);
  end;