Unicode C

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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Unicode C

#include <C_CkMailManW.h>

void ChilkatSample(void)
    {
    HCkMailManW mailman;
    int sizeBytes;

    //  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.

    mailman = CkMailManW_Create();

    //  Configure the POP3 server connection.
    CkMailManW_putMailHost(mailman,L"pop.example.com");
    CkMailManW_putMailPort(mailman,995);
    CkMailManW_putPopSsl(mailman,TRUE);
    CkMailManW_putPopUsername(mailman,L"user@example.com");
    CkMailManW_putPopPassword(mailman,L"myPassword");

    //  Get the size of a specific message by its UIDL.
    sizeBytes = CkMailManW_GetSizeByUidl(mailman,L"0000000123abcdef");
    wprintf(L"Message size (bytes): %d\n",sizeBytes);

    //  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.


    CkMailManW_Dispose(mailman);

    }