(DataFlex) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoImap
    Boolean iFetchUids
    Variant vMessageSet
    Handle hoMessageSet
    Integer iNumFound
    Integer iUpperBound
    Integer i
    Boolean iBUid
    Boolean iHeaderOnly
    Variant vEmail
    Handle hoEmail
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

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

    // Login
    Get ComLogin Of hoImap "****" "****" To iSuccess
    If (iSuccess = False) 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 = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the message IDs of all the emails in the mailbox
    // We can choose to fetch UIDs or sequence numbers.
    Move True To iFetchUids
    Get Create (RefClass(cComChilkatMessageSet)) To hoMessageSet
    If (Not(IsComObjectCreated(hoMessageSet))) Begin
        Send CreateComObject of hoMessageSet
    End
    Get pvComObject of hoMessageSet to vMessageSet
    Get ComQueryMbx Of hoImap "ALL" iFetchUids vMessageSet To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoImap To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComCount Of hoMessageSet To iNumFound
    If (iNumFound = 0) Begin
        Showln "No messages found."
        Procedure_Return
    End

    // Get the 1st 10 messages in messageSet.
    Move 10 To iUpperBound
    If (iNumFound < iUpperBound) Begin
        Move iNumFound To iUpperBound
    End

    Move 0 To i
    Get ComHasUids Of hoMessageSet To iBUid
    Move True To iHeaderOnly
    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    While (i < iUpperBound)

        Get ComGetId Of hoMessageSet i To iTemp1
        Get pvComObject of hoEmail to vEmail
        Get ComFetchEmail Of hoImap iHeaderOnly iTemp1 iBUid vEmail To iSuccess
        If (iSuccess = False) Begin
            Get ComLastErrorText Of hoImap To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Get ComSubject Of hoEmail To sTemp1
        Showln i ": " sTemp1

        Move (i + 1) To i
    Loop

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


End_Procedure