Get the Filename of an Attached Message

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Demonstrates the Chilkat Email.GetAttachedMessageFilename method, which returns the filename of the Nth attached (embedded) email. The filename is the filename attribute of the attached message's Content-Disposition header, and the index is zero-based. This example attaches an email and reads the attached message's filename.

Background: When an email forwards another message as an attachment, the nested message is a message/rfc822 part — a complete email tucked inside the carrier. Mail clients often give that part a filename (like forwarded.eml) via its Content-Disposition header so it can be saved to disk. This method reads that filename directly. Attached messages are counted separately from ordinary attachments (see NumAttachedMessages).

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bool success = false;

//  Demonstrates the GetAttachedMessageFilename method, which returns the filename of the
//  Nth attached (embedded) email.  The filename is the "filename" attribute of the
//  attached message's Content-Disposition header.  The index is zero-based.

//  Build an inner email to attach.
Chilkat.Email innerEmail = new Chilkat.Email();
innerEmail.Subject = "Embedded message";
innerEmail.From = "alice@example.com";
innerEmail.AddTo("Bob","bob@example.com");

//  Attach it to an outer email as a message/rfc822 part.
Chilkat.Email email = new Chilkat.Email();
email.Subject = "Has an attached message";
success = email.AttachEmail(innerEmail);
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Get the filename of the first attached message (index 0).
string fname = email.GetAttachedMessageFilename(0);
Debug.WriteLine("Attached message filename: " + fname);