DataFlex

Fetch Only an IMAP Message's Headers

Demonstrates the Chilkat Imap.FetchSingleHeaderAsMime method, which downloads and returns the MIME header block for one message, without downloading the body. If the second argument (bUID) is true, the first argument is a UID; otherwise it is a sequence number. This example fetches message 1's headers.

Background: Headers are tiny compared to a full message with attachments, so fetching just the header block is the fast, bandwidth-friendly way to build a message list — sender, subject, date — without pulling every body. It is also gentler on read state: retrieving only headers does not mark a message as seen. Download the full message later, on demand, when the user opens it.

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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoImap
    String sHeaders
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

    //  Demonstrates the Imap.FetchSingleHeaderAsMime method, which downloads and returns the MIME
    //  header block for one message, without downloading the body.  If the 2nd argument (bUID)
    //  is True, the 1st argument is a UID; otherwise it is a sequence number.

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

    Set ComSsl Of hoImap To True
    Set ComPort Of hoImap To 993

    Get ComConnect Of hoImap "imap.example.com" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComLogin Of hoImap "user@example.com" "myPassword" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComSelectMailbox Of hoImap "Inbox" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Download only the MIME header block of message sequence number 1.  bUID = False.
    Get ComFetchSingleHeaderAsMime Of hoImap 1 False To sHeaders
    Get ComLastMethodSuccess Of hoImap To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln sHeaders

    Get ComDisconnect Of hoImap To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End



End_Procedure