(PureBasic) 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 PureBasic Module Download Chilkat PureBasic Module

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

Procedure ChilkatExample()

    success.i = 0

    ; This example assumes 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

    ; Get the message IDs of all the emails in the mailbox
    ; We can choose to fetch UIDs or sequence numbers.
    fetchUids.i = 1
    messageSet.i = CkMessageSet::ckCreate()
    If messageSet.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkImap::ckQueryMbx(imap,"ALL",fetchUids,messageSet)
    If success = 0
        Debug CkImap::ckLastErrorText(imap)
        CkImap::ckDispose(imap)
        CkMessageSet::ckDispose(messageSet)
        ProcedureReturn
    EndIf

    numFound.i = CkMessageSet::ckCount(messageSet)
    If numFound = 0
        Debug "No messages found."
        CkImap::ckDispose(imap)
        CkMessageSet::ckDispose(messageSet)
        ProcedureReturn
    EndIf

    ; Get the 1st 10 messages in messageSet.
    upperBound.i = 10
    If numFound < upperBound
        upperBound = numFound
    EndIf

    i.i = 0
    bUid.i = CkMessageSet::ckHasUids(messageSet)
    headerOnly.i = 1
    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    While i < upperBound

        success = CkImap::ckFetchEmail(imap,headerOnly,CkMessageSet::ckGetId(messageSet,i),bUid,email)
        If success = 0
            Debug CkImap::ckLastErrorText(imap)
            CkImap::ckDispose(imap)
            CkMessageSet::ckDispose(messageSet)
            CkEmail::ckDispose(email)
            ProcedureReturn
        EndIf

        Debug Str(i) + ": " + CkEmail::ckSubject(email)

        i = i + 1
    Wend

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


    CkImap::ckDispose(imap)
    CkMessageSet::ckDispose(messageSet)
    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure