(DataFlex) Fetch Inbox Email Headers

Downloads the headers of all emails in the Inbox and shows some information about each, such as From, Subject, and whether the email has been seen (already read) or not.

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 vBundle
    Handle hoBundle
    Integer i
    Variant vEmailHeader
    Handle hoEmailHeader
    Integer iSeenFlag
    String sTemp1
    Integer iTemp1
    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 "myLogin" "myPassword" 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

    // Normally, when an email is downloaded, its "Seen" flag is automatically set.
    // We don't want our program to be interfering with the "Seen" flags.
    // To do this, set the PeekMode to True.
    Set ComPeekMode Of hoImap To True

    // After selecting the mailbox, the NumMessages property
    // will contain the number of emails in the mailbox.
    // When sequence numbers (not UIDs) are used to reference emails,
    // they range from 1 to N, where N is the number of messages in the mailbox.
    // This example will download the headers by sequence numbers.
    Get ComNumMessages Of hoImap To iTemp1
    Get ComFetchSequenceHeaders Of hoImap 1 iTemp1 To vBundle
    If (IsComObject(vBundle)) Begin
        Get Create (RefClass(cComChilkatEmailBundle)) To hoBundle
        Set pvComObject Of hoBundle To vBundle
    End
    Get ComLastMethodSuccess Of hoImap To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComMessageCount Of hoBundle To iTemp1
    If (iTemp1 = 0) Begin
        Showln "No messages in Inbox."
        Send Destroy of hoBundle
        Procedure_Return
    End

    // Loop over the email headers.  

    Get ComMessageCount Of hoBundle To iTemp1
    For i From 0 To (iTemp1 - 1)
        Get ComGetEmail Of hoBundle i To vEmailHeader
        If (IsComObject(vEmailHeader)) Begin
            Get Create (RefClass(cComChilkatEmail)) To hoEmailHeader
            Set pvComObject Of hoEmailHeader To vEmailHeader
        End
        Get ComFrom Of hoEmailHeader To sTemp1
        Showln sTemp1
        Get ComSubject Of hoEmailHeader To sTemp1
        Showln sTemp1

        // Get the "Seen" flag.
        // When an email is fetched from the IMAP server, the email flags are stored
        // within the email in the "ckx-imap-flags" header.
        // The call to GetMailFlag is simply getting the information from the email header.
        // (it is not communicating with the IMAP server to get this information, because
        // the information was obtained when downloading the headers)
        Get ComGetMailFlag Of hoImap vEmailHeader "Seen" To iSeenFlag
        If (iSeenFlag = 1) Begin
            Showln "This email has been read (already seen)"
        End
        Else Begin
            Showln "This email has not yet been read (it is not yet seen)"
        End

        // We can also look directly at the "ckx-imap-flags" header:
        Get ComGetHeaderField Of hoEmailHeader "ckx-imap-flags" To sTemp1
        Showln "ckx-imap-flags: " sTemp1

        Showln "--"
        Send Destroy of hoEmailHeader
    Loop

    Send Destroy of hoBundle

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


End_Procedure