(Delphi ActiveX) Transition from Imap.FetchHeaders to Imap.FetchMsgSet

Provides instructions for replacing deprecated FetchHeaders method calls with FetchMsgSet.

Note: This example requires Chilkat v11.0.0 or greater.

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;
mset: TMessageSet;
success: Integer;
bundleObj: IChilkatEmailBundle;
headersOnly: Integer;
bundleOut: TChilkatEmailBundle;
success: Integer;

begin
imap := TChilkatImap.Create(Self);

// ...
// ...

mset := TMessageSet.Create(Self);
success := imap.QueryMbx('FROM joe@example.com',1,mset.ControlInterface);
// ...
// ...

// ------------------------------------------------------------------------
// The FetchHeaders method is deprecated:

bundleObj := imap.FetchHeaders(mset.ControlInterface);
if (imap.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// ...
// ...

// ------------------------------------------------------------------------
// Do the equivalent using FetchMsgSet.
// Your application creates a new, empty EmailBundle object which is passed 
// in the last argument and filled upon success.

headersOnly := 1;

bundleOut := TChilkatEmailBundle.Create(Self);
success := imap.FetchMsgSet(headersOnly,mset.ControlInterface,bundleOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;
end;