(MFC) Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkImap.h>
#include <CkMessageSet.h>
#include <CkEmail.h>
#include <CkEmailBundle.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkImap imap;

    // Connect to an IMAP server.
    // Use TLS
    imap.put_Ssl(true);
    imap.put_Port(993);
    bool success = imap.Connect("imap.someMailServer.com");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Login
    success = imap.Login("****","****");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success != true) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkMessageSet *messageSet = 0;
    // We can choose to fetch UIDs or sequence numbers.
    bool fetchUids = true;
    // Get the message IDs of all the emails in the mailbox
    messageSet = imap.Search("ALL",fetchUids);
    if (imap.get_LastMethodSuccess() == false) {
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int numFound = messageSet->get_Count();
    if (numFound == 0) {
        strOut.append("No messages found.");
        strOut.append("\r\n");
        delete messageSet;
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get the 1st 10 messages in messageSet.
    int upperBound = 10;
    if (numFound < upperBound) {
        upperBound = numFound;
    }

    int i = 0;
    bool bUid = messageSet->get_HasUids();
    while (i < upperBound) {

        CkEmail *email = imap.FetchSingleHeader(messageSet->GetId(i),bUid);
        if (imap.get_LastMethodSuccess() == false) {
            strOut.append(imap.lastErrorText());
            strOut.append("\r\n");
            delete messageSet;
            SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
            return;

        }
        else {
            // Do whatever is needed with the email.. 
            // ....

            delete email;
        }

        i = i + 1;
    }

    // Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
    // from the search results message set:
    CkMessageSet firstTen;

    for (i = 0; i <= upperBound - 1; i++) {
        firstTen.InsertId(messageSet->GetId(i));
    }

    delete messageSet;

    // Download the 1st ten headers:
    CkEmailBundle *bundle = 0;
    bundle = imap.FetchHeaders(firstTen);
    if (imap.get_LastMethodSuccess() == false) {
        delete firstTen;
        strOut.append(imap.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Other examples show how to iterate over the emails contained within the bundle...

    // Disconnect from the IMAP server.
    success = imap.Disconnect();

    delete firstTen;
    delete bundle;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }