Delphi DLL

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

Demonstrates how to mark emails as read or unread. Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
imap: HCkImap;
numMsgs: Integer;
email: HCkEmail;
i: Integer;
bIsUid: Boolean;

begin
success := False;

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

imap := CkImap_Create();

// Connect to an IMAP server.
// Use TLS
CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);
success := CkImap_Connect(imap,'imap.example.com');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Login
success := CkImap_Login(imap,'myLogin','myPassword');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Select an IMAP mailbox
success := CkImap_SelectMailbox(imap,'Inbox');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Set PeekMode so that downloaded messages are not
// automatically marked as seen.
CkImap_putPeekMode(imap,True);

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

email := CkEmail_Create();

for i := 1 to numMsgs do
  begin
    // Download each email by sequence number (not UID)
    success := CkImap_FetchEmail(imap,False,i,False,email);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        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 := False;
    // Set the SEEN flag = 1 to mark the email as SEEN,
    // or set it to 0 to mark it as not-seen.
    success := CkImap_SetFlag(imap,i,bIsUid,'SEEN',1);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        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 := CkImap_SetMailFlag(imap,email,'SEEN',1);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        Exit;
      end;

  end;

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

CkImap_Dispose(imap);
CkEmail_Dispose(email);

end;