Visual FoxPro

Get the Size of a POP3 Message by UIDL

Demonstrates the Chilkat MailMan.GetSizeByUidl method, which returns the size, in bytes, of the email on the POP3 server identified by a UIDL. The size includes the full message content, including attachments, and the method returns -1 on error. This example looks up a message's size by its UIDL.

Background: A UIDL ("unique ID listing") is POP3's stable identifier for a message — it stays the same across sessions as long as the message remains in the mailbox. Checking a message's size before downloading lets a client skip or defer very large messages, enforce size limits, or show a progress estimate. You can obtain the available UIDLs from GetMailboxInfoXml or FetchUidls.

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LOCAL loMailman
LOCAL lnSizeBytes

*  Demonstrates the MailMan.GetSizeByUidl method, which returns the size, in bytes, of the
*  email on the POP3 server identified by a UIDL.  The size includes the full message
*  content, including attachments.  Returns -1 on error.

loMailman = CreateObject('Chilkat.MailMan')

*  Configure the POP3 server connection.
loMailman.MailHost = "pop.example.com"
loMailman.MailPort = 995
loMailman.PopSsl = 1
loMailman.PopUsername = "user@example.com"
loMailman.PopPassword = "myPassword"

*  Get the size of a specific message by its UIDL.
lnSizeBytes = loMailman.GetSizeByUidl("0000000123abcdef")
? "Message size (bytes): " + STR(lnSizeBytes)

*  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
*  connects and authenticates -- using the property settings above -- whenever a server
*  operation requires it.  Calling the explicit connect/authenticate methods can still be
*  helpful to determine whether a failure occurs while connecting or while authenticating.

RELEASE loMailman