(Tcl) Download IMAP Message Set using FetchBundle

Demonstrates how to read IMAP emails using the FetchBundle method.

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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 with the word "test" in the subject.
set fetchUids 1
# messageSet is a CkMessageSet
set messageSet [CkImap_Search $imap "Subject test" $fetchUids]
if {[CkImap_get_LastMethodSuccess $imap] != 1} then {
    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

# Download the messages in a single call to FetchBundle.
# 
# This only makes sense if the number of emails to be downloaded is not too large.  
# For example, you wouldn't want to download 10000 emails in a single call to FetchBundle.
# Why? For two reasons:  (1) It could potentially cause an out-of-memory condition, and 
# (2) it would take an extremely large amount of time.  The longer the amount of time,
# the greater the likelihood of some kind of external networking or server problem occuring,
# and if it happens, then you would need to re-download everything from the beginning again.
# For large numbers of emails, it's better to loop over the emails in the message set
# and download/process one at a time as shown here: Download IMAP Messages One at a Time
# Downloading one message at a time makes it possible to resume the downloads rather than restart the entire operation all over again.

# If the message set is reasonable in size, you can download all at once using FetchBundle:

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

# bundle is a CkEmailBundle
set bundle [CkImap_FetchBundle $imap $messageSet]
if {[CkImap_get_LastMethodSuccess $imap] == 0} then {
    delete_CkMessageSet $messageSet

    puts [CkImap_lastErrorText $imap]
    delete_CkImap $imap
    exit
}

# Display the Subject and From of each email.
set i 0
set numEmails [CkEmailBundle_get_MessageCount $bundle]
while {$i < $numEmails} {
    # email is a CkEmail
    set email [CkEmailBundle_GetEmail $bundle $i]

    puts [CkEmail_getHeaderField $email Date]
    puts [CkEmail_subject $email]
    puts [CkEmail_from $email]
    puts "--"

    delete_CkEmail $email

    set i [expr $i + 1]
}

delete_CkMessageSet $messageSet

delete_CkEmailBundle $bundle


delete_CkImap $imap