PureBasic

Fetch Full Email Given Email Header

When you fetch email headers using UIDs instead of sequence numbers, the email object (which includes only the header) will have auto-generated ckx-imap-* headers. These headers provide details like the UID and attachments. The IMAP UID is found in the ckx-imap-uid header. Additionally, the ckx-imap-isUid header indicates whether the email header was downloaded by UID, showing YES or NO. Since sequence numbers can change if emails are deleted, UIDs are essential for downloading the correct full email.

The Chilkat Email object offers a GetImapUid method to retrieve the UID from the ckx-imap-uid header. This UID can be used to fetch the full email.

PureBasic

IncludeFile "CkEmail.pb"
IncludeFile "CkImap.pb"

Procedure ChilkatExample()

    success.i = 0

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

    imap.i = CkImap::ckCreate()
    If imap.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect to an IMAP server.
    ; Use TLS
    CkImap::setCkSsl(imap, 1)
    CkImap::setCkPort(imap, 993)
    success = CkImap::ckConnect(imap,"imap.example.com")
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    ; Login
    success = CkImap::ckLogin(imap,"***","***")
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    ; Select an IMAP mailbox
    success = CkImap::ckSelectMailbox(imap,"Inbox")
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        ProcedureReturn
    EndIf

    emailHeader.i = CkEmail::ckCreate()
    If emailHeader.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    emailFull.i = CkEmail::ckCreate()
    If emailFull.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    uid.i = 2014
    isUid.i = 1

    ; Fetch only the email header
    success = CkImap::ckFetchEmail(imap,1,uid,isUid,emailHeader)
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        CkEmail::ckDispose(emailHeader)
        CkEmail::ckDispose(emailFull)
        ProcedureReturn
    EndIf

    ; Now fetch the full email
    uidFromCkxHeader.i = CkEmail::ckGetImapUid(emailHeader)
    If uidFromCkxHeader < 0
        ; Failed. 
        Debug "No ckx-imap-uid header was found."
        CkImap::ckDispose(imap)
        CkEmail::ckDispose(emailHeader)
        CkEmail::ckDispose(emailFull)
        ProcedureReturn
    EndIf

    success = CkImap::ckFetchEmail(imap,0,uid,isUid,emailFull)
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        CkEmail::ckDispose(emailHeader)
        CkEmail::ckDispose(emailFull)
        ProcedureReturn
    EndIf

    ; OK, we have the full email, do whatever we want...

    ; Disconnect from the IMAP server.
    success = CkImap::ckDisconnect(imap)


    CkImap::ckDispose(imap)
    CkEmail::ckDispose(emailHeader)
    CkEmail::ckDispose(emailFull)


    ProcedureReturn
EndProcedure