(Tcl) How to Download Messages in MessageSet One at a Time

If a message set contains a huge number of emails, it's NOT a good idea to try to download all at once into an email bundle using a method such as FetchBundle. It's better to iterate over the messages in the set to download one by one.

Chilkat Tcl Extension Downloads Chilkat Tcl Extension Downloads

load ./chilkat.dll

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

set imap [new_CkImap]

# Connect using TLS.
CkImap_put_Ssl $imap 1
CkImap_put_Port $imap 993
set success [CkImap_Connect $imap "imap.example.com"]
if {$success != 1} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

# Authenticate
set success [CkImap_Login $imap "email_account_login" "email_account_password"]
if {$success != 1} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

# Select an IMAP mailbox
set success [CkImap_SelectMailbox $imap "Inbox"]
if {$success != 1} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

# Search for messages and return a set of matching messages.
# (This example will simply search for ALL messages.)
set fetchUids 1
# messageSet is a CkMessageSet
set messageSet [CkImap_Search $imap "ALL" $fetchUids]
if {[CkImap_get_LastMethodSuccess $imap] != 1} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

puts "Number of messages = [CkMessageSet_get_Count $messageSet]"

set i 0
while {$i < [CkMessageSet_get_Count $messageSet]} {
    # email is a CkEmail
    set email [CkImap_FetchSingle $imap [CkMessageSet_GetId $messageSet $i] $fetchUids]
    if {[CkImap_get_LastMethodSuccess $imap] != 1} then {
        puts [CkImap_lastErrorText $imap]
        delete_CkMessageSet $messageSet

        delete_CkImap $imap
        exit
    }

    puts [CkEmail_from $email]; [CkEmail_subject $email]
    delete_CkEmail $email

    set i [expr $i + 1]
}

delete_CkMessageSet $messageSet

puts "OK"

delete_CkImap $imap