Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server.

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uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATIMAPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
imap: TChilkatImap;
success: Integer;
totalNum: Integer;
messageSet: CHILKATIMAPLib_TLB.IMessageSet;
fetchUids: Integer;
numUnseen: Integer;
i: Integer;
msgId: Integer;

begin
imap := TChilkatImap.Create(Self);

//  Anything unlocks the component and begins a fully-functional 30-day trial.
success := imap.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Connect to an IMAP server.
success := imap.Connect('mail.chilkatsoft.com');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Login
success := imap.Login('***','***');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success <> 1) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

//  After selecting the mailbox. the total number of emails
//  is immediately available:
totalNum := imap.NumMessages;
Memo1.Lines.Add(IntToStr(totalNum));

//  To determine the number of unseen messages, a call
//  to Search is required, which returns the set of UIDs
//  of all unseen messages.

//  We can choose to fetch UIDs or sequence numbers.
fetchUids := 1;

messageSet := imap.Search('UNSEEN',fetchUids);
if (messageSet = nil ) then
  begin
    ShowMessage(imap.LastErrorText);
    Exit;
  end;

numUnseen := messageSet.Count;
Memo1.Lines.Add(IntToStr(numUnseen));

Memo1.Lines.Add('UIDs ----');

//  Display the UIDs

for i := 0 to messageSet.Count - 1 do
  begin
    msgId := messageSet.GetId(i);
    Memo1.Lines.Add(IntToStr(msgId));
  end;

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


end;