(Unicode C) Send Email to Distribution List

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

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#include <C_CkMailManW.h>
#include <C_CkEmailW.h>
#include <C_CkBinDataW.h>
#include <C_CkStringTableW.h>
#include <C_CkStringBuilderW.h>

void ChilkatSample(void)
    {
    HCkMailManW mailman;
    BOOL success;
    HCkEmailW email;
    HCkBinDataW bdMime;
    HCkStringTableW distList;
    HCkStringBuilderW sbRecipients;
    int i;
    int szDistList;
    int j;

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

    mailman = CkMailManW_Create();

    CkMailManW_putSmtpHost(mailman,L"smtp.mymailserver.com");
    CkMailManW_putSmtpPort(mailman,465);
    CkMailManW_putSmtpSsl(mailman,TRUE);
    CkMailManW_putSmtpUsername(mailman,L"myUsername");
    CkMailManW_putSmtpPassword(mailman,L"myPassword");

    // Create a new email object
    email = CkEmailW_Create();
    CkEmailW_putSubject(email,L"This is a test");
    CkEmailW_putBody(email,L"This is a test");
    CkEmailW_putFrom(email,L"Senders Name <sender@example.com>");
    CkEmailW_AddTo(email,L"Subscribers",L"subscribers@example.com");

    bdMime = CkBinDataW_Create();
    CkMailManW_RenderToMimeBd(mailman,email,bdMime);

    // Load a file containing one email address per line.
    distList = CkStringTableW_Create();
    success = CkStringTableW_AppendFromFile(distList,1000,L"utf-8",L"qa_data/distList.txt");
    if (success == FALSE) {
        wprintf(L"%s\n",CkStringTableW_lastErrorText(distList));
        CkMailManW_Dispose(mailman);
        CkEmailW_Dispose(email);
        CkBinDataW_Dispose(bdMime);
        CkStringTableW_Dispose(distList);
        return;
    }

    sbRecipients = CkStringBuilderW_Create();

    i = 0;
    szDistList = CkStringTableW_getCount(distList);
    j = 0;
    while (i < szDistList) {

        // Build a list of comma-separated recipients.
        if (j > 0) {
            CkStringBuilderW_Append(sbRecipients,L",");
        }

        CkStringBuilderW_Append(sbRecipients,CkStringTableW_stringAt(distList,i));

        i = i + 1;
        j = j + 1;

        // If we have 20 recipients, or we have the final recipient in the final chunk, then send.
        if ((j == 20) || (i == szDistList)) {
            success = CkMailManW_SendMimeBd(mailman,L"sender@example.com",CkStringBuilderW_getAsString(sbRecipients),bdMime);
            if (success != TRUE) {
                wprintf(L"%s\n",CkMailManW_lastErrorText(mailman));
                CkMailManW_Dispose(mailman);
                CkEmailW_Dispose(email);
                CkBinDataW_Dispose(bdMime);
                CkStringTableW_Dispose(distList);
                CkStringBuilderW_Dispose(sbRecipients);
                return;
            }

            j = 0;
            CkStringBuilderW_Clear(sbRecipients);
        }

    }

    success = CkMailManW_CloseSmtpConnection(mailman);
    if (success != TRUE) {
        wprintf(L"Connection to SMTP server not closed cleanly.\n");
    }

    wprintf(L"Email sent to distirbution list.\n");


    CkMailManW_Dispose(mailman);
    CkEmailW_Dispose(email);
    CkBinDataW_Dispose(bdMime);
    CkStringTableW_Dispose(distList);
    CkStringBuilderW_Dispose(sbRecipients);

    }