VB.NET
VB.NET
Get the Content-ID of an Attachment
See more Email Object Examples
Demonstrates the Chilkat Email.GetAttachmentContentID method, which returns the Content-ID header field for the Nth attachment. The index is zero-based, so the first attachment is 0. This example adds an attachment and reads its Content-ID (which may be empty when none was assigned).
Background: A
Content-ID is a unique identifier for a MIME part. It is essential for inline "related" resources, where HTML references an image by cid:, but ordinary file attachments usually have none. Reading it is useful when inspecting how a message is assembled, or when distinguishing parts that are referenced from the body versus those meant purely as downloadable attachments.Chilkat VB.NET Downloads
' Demonstrates the GetAttachmentContentID method, which returns the Content-ID header
' field for the Nth attachment. The index is zero-based (the first attachment is 0).
Dim email As New Chilkat.Email
email.Subject = "Attachment Content-ID"
email.AddStringAttachment("notes.txt","Some notes.")
' Get the Content-ID of the first attachment (may be empty if none was assigned).
Dim cid As String = email.GetAttachmentContentID(0)
Debug.WriteLine("Attachment 0 Content-ID: " & cid)