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DataFlex Examples

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(DataFlex) Fetch Full Email Given Email Header

When email headers are fetched using UIDs (not sequence numbers), then the resultant email object (containing only the header) will include auto-generated ckx-imap-* header fields to record information about the uid, attachments, etc. The IMAP UID of the email will be available in the "ckx-imap-uid" header. There will also be a "ckx-imap-isUid" header field having the value "YES" or "NO". If the email header was downloaded by UID, then "ckx-imap-isUID" will contain the value "YES" and the value of the "ckx-imap-uid" header field is the IMAP UID. If the "ckx-imap-isUID" header has a value of "NO", then the "ckx-imap-uid" header field represents the sequence number. (Sequence numbers of emails on the server can change over time, depending on whether emails are deleted. UIDs must be used to ensure that the correct full email is downloaded.)

The Chilkat Email object provides a GetImapUid method to return the UID from the ckx-imap-uid header. This can then be used to download the full email using the FetchSingle method. Assuming the UID is known, download a single email by UID from an IMAP mail server.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoImap
    Boolean iSuccess
    Variant vEmailHeader
    Handle hoEmailHeader
    Variant vEmailFull
    Handle hoEmailFull
    Integer iUid
    Boolean iIsUid
    Integer iUidFromCkxHeader
    String sTemp1
    Boolean bTemp1

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

    Get Create (RefClass(cComChilkatImap)) To hoImap
    If (Not(IsComObjectCreated(hoImap))) Begin
        Send CreateComObject of hoImap
    End

    // Connect to an IMAP server.
    // Use TLS
    Set ComSsl Of hoImap To True
    Set ComPort Of hoImap To 993
    Get ComConnect Of hoImap "imap.someMailServer.com" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Login
    Get ComLogin Of hoImap "***" "***" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Select an IMAP mailbox
    Get ComSelectMailbox Of hoImap "Inbox" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Move 2014 To iUid
    Move True To iIsUid

    // Fetch only the email header
    Get ComFetchSingleHeader Of hoImap iUid iIsUid To vEmailHeader
    If (IsComObject(vEmailHeader)) Begin
        Get Create (RefClass(cComChilkatEmail)) To hoEmailHeader
        Set pvComObject Of hoEmailHeader To vEmailHeader
    End
    Get ComLastMethodSuccess Of hoImap To bTemp1
    If (bTemp1 = True) Begin

        // Now fetch the full email
        Get ComGetImapUid Of hoEmailHeader To iUidFromCkxHeader
        If (iUidFromCkxHeader < 0) Begin
            // Failed. 
            Send Destroy of hoEmailHeader
            Showln "No ckx-imap-uid header was found."
            Procedure_Return
        End

        Get ComFetchSingle Of hoImap iUidFromCkxHeader True To vEmailFull
        If (IsComObject(vEmailFull)) Begin
            Get Create (RefClass(cComChilkatEmail)) To hoEmailFull
            Set pvComObject Of hoEmailFull To vEmailFull
        End
        Get ComLastMethodSuccess Of hoImap To bTemp1
        If (bTemp1 = True) Begin

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

            Send Destroy of hoEmailFull
        End

        Send Destroy of hoEmailHeader
    End

    // Disconnect from the IMAP server.
    Get ComDisconnect Of hoImap To iSuccess


End_Procedure

 

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