Delphi ActiveX

Fetch 1st N Headers of Search Results

Calls Search to get a message set, then downloads the 1st N messages in the message set. There are two equivalent ways of doing it: (1) iterate from 0 to N-1 and download each message individually, or (2) create a new message set that contains the 1st N messages and pass it to FetchHeaders. Both are demonstrated here. Delphi ActiveX

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
success: Integer;
imap: TChilkatImap;
fetchUids: Integer;
messageSet: TMessageSet;
numFound: Integer;
upperBound: Integer;
i: Integer;
bUid: Integer;
headerOnly: Integer;
email: TChilkatEmail;

begin
success := 0;

// 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.example.com');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Login
success := imap.Login('****','****');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Get the message IDs of all the emails in the mailbox
// We can choose to fetch UIDs or sequence numbers.
fetchUids := 1;
messageSet := TMessageSet.Create(Self);
success := imap.QueryMbx('ALL',fetchUids,messageSet.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

numFound := messageSet.Count;
if (numFound = 0) then
  begin
    Memo1.Lines.Add('No messages found.');
    Exit;
  end;

// Get the 1st 10 messages in messageSet.
upperBound := 10;
if (numFound < upperBound) then
  begin
    upperBound := numFound;
  end;

i := 0;
bUid := messageSet.HasUids;
headerOnly := 1;
email := TChilkatEmail.Create(Self);

while i < upperBound do
  begin

    success := imap.FetchEmail(headerOnly,messageSet.GetId(i),bUid,email.ControlInterface);
    if (success = 0) then
      begin
        Memo1.Lines.Add(imap.LastErrorText);
        Exit;
      end;

    Memo1.Lines.Add(IntToStr(i) + ': ' + email.Subject);

    i := i + 1;
  end;

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