(VB.NET) IMAP Read PEC Email of Aruba and Extract the Invoice XML Files

IMAP Read PEC Email of Aruba and Extract the Invoice XML Files.

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' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim imap As New Chilkat.Imap

' Connect using TLS.
imap.Ssl = True
imap.Port = 993
Dim success As Boolean = imap.Connect("imap.example.com")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Authenticate
success = imap.Login("email_account_login","email_account_password")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Select an IMAP mailbox
success = imap.SelectMailbox("Inbox/postacert")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


' Search for messages having "POSTA CERTIFICATA: Invio File" in the subject.
Dim fetchUids As Boolean = True
Dim messageSet As Chilkat.MessageSet = imap.Search("SUBJECT ""POSTA CERTIFICATA: Invio File""",fetchUids)
If (imap.LastMethodSuccess = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If

If (messageSet.Count < 1) Then
    Debug.WriteLine("No messages found.")

    Exit Sub
End If

' For our example, we'll process only the 1st email in the messageSet.
' Download the MIME source of the email into a StringBuilder object.
Dim email As Chilkat.Email = imap.FetchSingle(messageSet.GetId(0),messageSet.HasUids)
If (imap.LastMethodSuccess = False) Then
    Debug.WriteLine(imap.LastErrorText)

    Exit Sub
End If




' The email should contain an attached email.
' The Invoice XML is contained within the attached email.
Dim attachedEmail As Chilkat.Email = email.GetAttachedMessage(0)
If (email.LastMethodSuccess = False) Then
    Debug.WriteLine(email.LastErrorText)

    Exit Sub
End If



' Get the MIME of the attached email..
Dim sbMime As New Chilkat.StringBuilder
success = attachedEmail.GetMimeSb(sbMime)


' Load it into a Chilkat MIME object.
Dim mime As New Chilkat.Mime
success = mime.LoadMimeSb(sbMime)

' Examine the structure of the MIME.
Debug.WriteLine(mime.GetStructure("text"))

' The MIME has this structure:
' multipart/mixed
'     application/octet-stream
'     application/octet-stream     <-- This is where the XML is contained.   It is within an opaque signature.
'     text/plain

' The 2nd application/octet-stream MIME header looks like this:

' ------=_Part_329673_-1348225228.1579889273592
' Content-Type: application/octet-stream; name="SM99999_99aaa.xml.p7m"
' Content-Transfer-Encoding: base64
' Content-Disposition: attachment; filename="SM99999_99aaa.xml.p7m"

' Let's get the binary content of the .p7m
Dim bdP7m As New Chilkat.BinData
' Get the 2nd sub-part, at index 1 because index 0 is the 1st sub-part.
Dim mimeP7m As Chilkat.Mime = mime.GetPart(1)
If (mime.LastMethodSuccess <> True) Then
    Debug.WriteLine("Failed to get 2nd sub-part. Perhaps the MIME does not have a 2nd sub-part?")
    Exit Sub
End If

success = mimeP7m.GetBodyBd(bdP7m)


' Verify the signature, which also extracts the content contained within the opaque signature.
Dim crypt As New Chilkat.Crypt2
success = crypt.OpaqueVerifyBd(bdP7m)
If (success = False) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


' The bdP7m now contains the Invoice XML.
' Load it into an XML object.
Dim xml As New Chilkat.Xml
success = xml.LoadBd(bdP7m,True)

Debug.WriteLine(xml.GetXml())

' We have XML such as the following:
' 
' <?xml version="1.0" encoding="windows-1252"?>
' <?xml-stylesheet type="text/xsl" href="fatturapa_v1.2.xsl"?>
' <p:FatturaElettronica versione="FPR12" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" 
'     xmlns:p="http://ivaservizi.agenziaentrate.gov.it/docs/xsd/fatture/v1.2" 
'     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
'     <FatturaElettronicaHeader>
' 	...
'     </FatturaElettronicaHeader>
'     <FatturaElettronicaBody>
' 	...
'     </FatturaElettronicaBody>
' </p:FatturaElettronica>


' Use this online tool to generate parsing code from sample XML: 
' Generate Parsing Code from XML


Debug.WriteLine("success.")