(CkPython) 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.

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import sys
import chilkat

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

imap = chilkat.CkImap()

# Connect using TLS.
imap.put_Ssl(True)
imap.put_Port(993)
success = imap.Connect("imap.example.com")
if (success != True):
    print(imap.lastErrorText())
    sys.exit()

# Authenticate
success = imap.Login("email_account_login","email_account_password")
if (success != True):
    print(imap.lastErrorText())
    sys.exit()

# Select an IMAP mailbox
success = imap.SelectMailbox("Inbox")
if (success != True):
    print(imap.lastErrorText())
    sys.exit()

# Search for messages and return a set of matching messages.
# (This example will simply search for ALL messages.)
fetchUids = True
# messageSet is a CkMessageSet
messageSet = imap.Search("ALL",fetchUids)
if (imap.get_LastMethodSuccess() != True):
    print(imap.lastErrorText())
    sys.exit()

print("Number of messages = " + str(messageSet.get_Count()))

i = 0
while i < messageSet.get_Count() :
    # email is a CkEmail
    email = imap.FetchSingle(messageSet.GetId(i),fetchUids)
    if (imap.get_LastMethodSuccess() != True):
        print(imap.lastErrorText())

        sys.exit()

    print(email.ck_from() + "; " + email.subject())

    i = i + 1

print("OK")