PowerBuilder

Get the Content-ID of an Attachment

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.

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integer li_rc
oleobject loo_Email
string ls_Cid

//  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).

loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")
if li_rc < 0 then
    destroy loo_Email
    MessageBox("Error","Connecting to COM object failed")
    return
end if
loo_Email.Subject = "Attachment Content-ID"

loo_Email.AddStringAttachment("notes.txt","Some notes.")

//  Get the Content-ID of the first attachment (may be empty if none was assigned).
ls_Cid = loo_Email.GetAttachmentContentID(0)
Write-Debug "Attachment 0 Content-ID: " + ls_Cid


destroy loo_Email