(Delphi ActiveX) Transition from MailMan.GetHeaders to MailMan.FetchRange

Provides instructions for replacing deprecated GetHeaders method calls with FetchRange.

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
mailman: TChilkatMailMan;
numBodyLines: Integer;
fromIndex: Integer;
toIndex: Integer;
bundleObj: IChilkatEmailBundle;
keepOnServer: Integer;
headersOnly: Integer;
bundleOut: TChilkatEmailBundle;
success: Integer;

begin
mailman := TChilkatMailMan.Create(Self);

// ...
// ...

numBodyLines := 3;
fromIndex := 0;
toIndex := 9;

// ------------------------------------------------------------------------
// The GetHeaders method is deprecated:

bundleObj := mailman.GetHeaders(numBodyLines,fromIndex,toIndex);
if (mailman.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;

// ...
// ...

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

keepOnServer := 1;
headersOnly := 1;

bundleOut := TChilkatEmailBundle.Create(Self);
success := mailman.FetchRange(keepOnServer,headersOnly,numBodyLines,fromIndex,toIndex,bundleOut.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(mailman.LastErrorText);
    Exit;
  end;
end;