CkPython

Async Methods Returning an Object

See more Async Examples

Demonstrates how to call an asynchronous method that returns an object. This example reads email from a POP3 server using the Async versions of the Chilkat methods. CkPython

import sys
import chilkat

success = False

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

success = False

mailman = chilkat.CkMailMan()

# Set the POP3 server's hostname
mailman.put_MailHost("pop.example.com")

# Set the POP3 login/password and any other requirements..
mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")
mailman.put_PopSsl(True)
mailman.put_MailPort(995)

# Connect to the POP3 server:
# task is a CkTask
task = mailman.Pop3BeginSessionAsync()
if (mailman.get_LastMethodSuccess() == False):
    print(mailman.lastErrorText())
    sys.exit()

# Start the background task.
success = task.Run()
if (not success):
    print(task.lastErrorText())

    sys.exit()

# Wait for the POP3 connect task to finish.
# The True/False returned by Wait applies to the Wait method call, not the task.
maxWaitMs = 30000
success = task.Wait(maxWaitMs)
if (not success or (task.get_StatusInt() != 7) or (task.get_TaskSuccess() != True)):
    if (not success):
        # The task.LastErrorText applies to the Wait method call.
        print(task.lastErrorText())
    else:
        # The ResultErrorText applies to the underlying task method call (i.e. the Pop3BeginSession)
        print(task.status())
        print(task.resultErrorText())

    sys.exit()

# Get the number of messages in the mailbox.
# task is a CkTask
task = mailman.GetMailboxCountAsync()

# To keep the example short, we'll skip handling failures.
# The failures would be handled in the same way as shown above.

success = task.Run()
success = task.Wait(maxWaitMs)
numMessages = task.GetResultInt()

if (numMessages == 0):
    sys.exit()

email = chilkat.CkEmail()

for i in range(1,(numMessages)-1):

    # task is a CkTask
    task = mailman.FetchByMsgnumAsync(i)
    if (mailman.get_LastMethodSuccess() == False):
        print(mailman.lastErrorText())
        sys.exit()

    success = task.Run()
    success = task.Wait(maxWaitMs)
    if (not success or (task.get_StatusInt() != 7) or (task.get_TaskSuccess() != True)):
        if (not success):
            # The task.LastErrorText applies to the Wait method call.
            print(task.lastErrorText())
        else:
            # The ResultErrorText applies to the underlying task method call (i.e. the FetchByMsgnum)
            print(task.status())
            print(task.resultErrorText())

        sys.exit()

    # Each Chilkat object that can be a return value of an asynchronous task will
    # have a method named LoadTaskResult.  The object returned in the underlying
    # asynchronous method call is retrieved by calling LoadTaskResult. 

    # To say it another way: The application will provide a pre-existing object of
    # the desired return type (in this case it is an email object).  This object is
    # loaded by calling LoadTaskResult.  

    success = email.LoadTaskResult(task)

    if (not success):
        print(email.lastErrorText())
        sys.exit()
    else:
        print(email.ck_from() + ": " + email.subject() + "\n")