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

Demonstrates how to mark emails as read or unread.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
imap: TChilkatImap;
success: Integer;
numMsgs: Integer;
i: Integer;
email: IChilkatEmail;
bIsUid: Integer;

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

imap := TChilkatImap.Create(Self);

// Connect to an IMAP server.
// Use TLS
imap.Ssl := 1;
imap.Port := 993;
success := imap.Connect('imap.someMailServer.com');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Login
success := imap.Login('myLogin','myPassword');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Set PeekMode so that downloaded messages are not
// automatically marked as seen.
imap.PeekMode := 1;

// The NumMessages property contains the number of messages 
// in the currently selected mailbox.
numMsgs := imap.NumMessages;
if (numMsgs = 0) then
  begin
    Exit;
  end;

for i := 1 to numMsgs do
  begin
    // Download each email by sequence number (not UID)

    email := imap.FetchSingle(i,0);
    if (imap.LastMethodSuccess = 0) then
      begin
        Memo1.Lines.Add(imap.LastErrorText);
        Exit;
      end;

    // 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:
    bIsUid := 0;
    // 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 <> 1) then
      begin
        Memo1.Lines.Add(imap.LastErrorText);
        Exit;
      end;

    // 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 <> 1) then
      begin
        Memo1.Lines.Add(imap.LastErrorText);
        Exit;
      end;

  end;

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