PowerBuilder

Get a Header Field from an Alternative Body

Demonstrates the Chilkat Email.GetAltHeaderField method, which returns the value of a header field within the Nth alternative body's MIME sub-part. The first argument is the zero-based alternative index; the second is the header field name. This example builds a message with plain-text and HTML alternatives and reads the Content-Type of the first alternative.

Background: A multipart/alternative message is a tree: each alternative body is its own MIME sub-part with its own little header block (Content-Type, Content-Transfer-Encoding, etc.). The top-level Email header methods read the message headers, whereas GetAltHeaderField reaches into a specific alternative's sub-part — useful for inspecting exactly how each representation is typed and encoded.

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integer li_rc
oleobject loo_Email
string ls_Ct

//  Demonstrates the GetAltHeaderField method, which returns the value of a header field
//  within the Nth alternative body's MIME sub-part.  The 1st argument is the zero-based
//  alternative index; the 2nd is the header field name.

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

//  Create an email with plain-text and HTML alternatives.
loo_Email.SetTextBody("This is the plain-text alternative.","text/plain")
loo_Email.AddHtmlAlternativeBody("<html><body>This is the HTML alternative.</body></html>")

//  Get the Content-Type header of the first alternative body (index 0).
ls_Ct = loo_Email.GetAltHeaderField(0,"Content-Type")
Write-Debug "Alternative 0 Content-Type: " + ls_Ct


destroy loo_Email