(C# UWP/WinRT) Process Large POP3 Mailbox

Demonstrates how to read email from a mailbox that may contain a large number of emails.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Chilkat.MailMan mailman = new Chilkat.MailMan();

mailman.MailHost = "pop.example.com";

mailman.PopUsername = "myLogin";
mailman.PopPassword = "myPassword";

mailman.MailPort = 995;
mailman.PopSsl = true;

// Get the list of UIDLs for all emails in the mailbox.
Chilkat.StringArray sa = await mailman.GetUidlsAsync();
if (mailman.LastMethodSuccess == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

int i;
int numEmails = sa.Count;
if (numEmails == 0) {
    Debug.WriteLine("Mailbox is empty");
    return;
}

int chunkSize = 6;

// Download the emails in chunks of 6 emails each.
int chunkBeginIdx = 0;
int chunkEndIdx = chunkSize - 1;
if (chunkEndIdx >= numEmails) {
    chunkEndIdx = numEmails - 1;
}

Chilkat.StringArray saChunk = new Chilkat.StringArray();
while ((chunkBeginIdx < numEmails)) {

    Debug.WriteLine(Convert.ToString(chunkBeginIdx) + " to " + Convert.ToString(chunkEndIdx));

    // Build a chunk of UIDLs.
    saChunk.Clear();
    for (i = chunkBeginIdx; i <= chunkEndIdx; i++) {
        saChunk.Append(sa.GetString(i));
    }

    // Log the UIDLs in this chunk...
    string chunkStr = saChunk.SaveToText();
    Debug.WriteLine(chunkStr);

    // Download this chunk of email from the POP3 server.
    Chilkat.EmailBundle bundle = await mailman.FetchMultipleAsync(saChunk);
    if (mailman.LastMethodSuccess == false) {
        Debug.WriteLine(mailman.LastErrorText);
        return;
    }

    Debug.WriteLine("Downloaded " + Convert.ToString(bundle.MessageCount) + " emails.");
    Debug.WriteLine("----");

    // Process the bundle...
    // (your application's processing code goes here...)

    // Get the next chunk...
    chunkBeginIdx = chunkBeginIdx + chunkSize;
    chunkEndIdx = chunkEndIdx + chunkSize;
    if (chunkEndIdx >= numEmails) {
        chunkEndIdx = numEmails - 1;
    }

}