Delphi ActiveX

Check if a MIME Tree Contains Encrypted Parts

Demonstrates the Chilkat Mime.ContainsEncryptedParts method, which returns whether the currently visible MIME tree contains a CMS/PKCS #7 encrypted entity. 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 tree-wide counterpart to IsEncrypted: it finds an encrypted entity nested anywhere in the message, not just at the top. This lets you detect partially-encrypted messages and decide which parts require decryption before processing.

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var
success: Integer;
mime: TChilkatMime;

begin
success := 0;

//  Demonstrates the Mime.ContainsEncryptedParts method, which returns whether the MIME tree contains a CMS/PKCS #7 encrypted entity.  It takes no arguments.

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

if (mime.ContainsEncryptedParts()) then
  begin
    Memo1.Lines.Add('The message tree contains an encrypted part.');
  end
else
  begin
    Memo1.Lines.Add('The message tree contains no encrypted part.');
  end;