(Delphi DLL) Transition from Imap.FetchChunk to Imap.FetchRange

Provides instructions for replacing deprecated FetchChunk method calls with FetchRange.

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

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
imap: HCkImap;
startSeqNum: Integer;
count: Integer;
failedSet: HCkMessageSet;
fetchedSet: HCkMessageSet;
bundleObj: HCkEmailBundle;
headersOnly: Boolean;
bundleOut: HCkEmailBundle;
success: Boolean;

begin
imap := CkImap_Create();

// ...
// ...

startSeqNum := 1;
count := 5;

failedSet := CkMessageSet_Create();
fetchedSet := CkMessageSet_Create();

// ------------------------------------------------------------------------
// The FetchChunk method is deprecated:

bundleObj := CkImap_FetchChunk(imap,startSeqNum,count,failedSet,fetchedSet);
if (CkImap_getLastMethodSuccess(imap) = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// ...
// ...

CkEmailBundle_Dispose(bundleObj);

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

headersOnly := False;

bundleOut := CkEmailBundle_Create();
success := CkImap_FetchRange(imap,headersOnly,startSeqNum,count,bundleOut);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

CkImap_Dispose(imap);
CkMessageSet_Dispose(failedSet);
CkMessageSet_Dispose(fetchedSet);
CkEmailBundle_Dispose(bundleOut);

end;