C#

Mark IMAP Email as Read/Unread (Seen/Unseen)

Demonstrates how to mark emails as read or unread. C#

bool success = false;

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

Chilkat.Imap imap = new Chilkat.Imap();

//  Connect to an IMAP server.
//  Use TLS
imap.Ssl = true;
imap.Port = 993;
success = imap.Connect("imap.example.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Login
success = imap.Login("myLogin","myPassword");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Select an IMAP mailbox
success = imap.SelectMailbox("Inbox");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Set PeekMode so that downloaded messages are not
//  automatically marked as seen.
imap.PeekMode = true;

//  The NumMessages property contains the number of messages 
//  in the currently selected mailbox.
int numMsgs = imap.NumMessages;
if (numMsgs == 0) {
    return;
}

Chilkat.Email email = new Chilkat.Email();
int i;
for (i = 1; i <= numMsgs; i++) {
    //  Download each email by sequence number (not UID)
    success = imap.FetchEmail(false,i,false,email);
    if (success == false) {
        Debug.WriteLine(imap.LastErrorText);
        return;
    }

    //  If desired, mark the email as SEEN.  There are two
    //  ways to do it:

    //  1) Set the flag directly by using the sequence number
    //  Indicate that we are passing a sequence number and
    //  not a UID:
    bool bIsUid = false;
    //  Set the SEEN flag = 1 to mark the email as SEEN,
    //  or set it to 0 to mark it as not-seen.
    success = imap.SetFlag(i,bIsUid,"SEEN",1);
    if (success == false) {
        Debug.WriteLine(imap.LastErrorText);
        return;
    }

    //  2) Alternatively, we can use the email object.
    //  When an email is downloaded from the IMAP server
    //  Chilkat will add a "ckx-imap-uid" header to the email.
    //  This makes it possible to know the UID associated with
    //  the email.  (This is not the sequence number, which may change
    //  from session to session, but the UID which does not change.
    //  The SetMailFlag method is identical to SetFlag, except
    //  it gets the UID from the ckx-imap-uid header.
    //  For example:
    success = imap.SetMailFlag(email,"SEEN",1);
    if (success == false) {
        Debug.WriteLine(imap.LastErrorText);
        return;
    }

}

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