Unicode C

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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#include <C_CkMailManW.h>
#include <C_CkStringTableW.h>
#include <C_CkEmailBundleW.h>
#include <C_CkEmailW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkMailManW mailman;
    HCkStringTableW uidls;
    HCkEmailBundleW bundle;
    int n;
    HCkEmailW email;
    int i;

    success = FALSE;

    //  Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
    //  listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
    //  StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
    //  server.

    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");

    //  Build the set of UIDLs to fetch.
    uidls = CkStringTableW_Create();
    CkStringTableW_Append(uidls,L"0000000123abcdef");
    CkStringTableW_Append(uidls,L"0000000124abcdef");

    //  Fetch the listed messages (full bodies) into a bundle.
    //  headersOnly=FALSE (fetch the entire message).
    //  Note: numBodyLines only applies when headersOnly is TRUE (it sets how many lines of the
    //  body to include along with the headers).  When headersOnly is FALSE, the entire message
    //  is fetched and numBodyLines is ignored.
    bundle = CkEmailBundleW_Create();

    success = CkMailManW_FetchUidlSet(mailman,uidls,FALSE,0,bundle);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
        CkMailManW_Dispose(mailman);
        CkStringTableW_Dispose(uidls);
        CkEmailBundleW_Dispose(bundle);
        return;
    }

    n = CkEmailBundleW_getMessageCount(bundle);
    wprintf(L"Fetched %d messages.\n",n);

    email = CkEmailW_Create();

    for (i = 0; i <= n - 1; i++) {
        success = CkEmailBundleW_EmailAt(bundle,i,email);
        wprintf(L"%s\n",CkEmailW_subject(email));
    }

    //  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);
    CkStringTableW_Dispose(uidls);
    CkEmailBundleW_Dispose(bundle);
    CkEmailW_Dispose(email);

    }