(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.

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;
success: Integer;
messageSet: IMessageSet;
fetchUids: Integer;
numFound: Integer;
upperBound: Integer;
i: Integer;
bUid: Integer;
email: IChilkatEmail;
firstTen: TMessageSet;
bundle: IChilkatEmailBundle;

begin
// 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.someMailServer.com');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Login
success := imap.Login('****','****');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Select an IMAP mailbox
success := imap.SelectMailbox('Inbox');
if (success <> 1) then
  begin
    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// We can choose to fetch UIDs or sequence numbers.
fetchUids := 1;
// Get the message IDs of all the emails in the mailbox
messageSet := imap.Search('ALL',fetchUids);
if (imap.LastMethodSuccess = 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;
while i < upperBound do
  begin

    email := imap.FetchSingleHeader(messageSet.GetId(i),bUid);
    if (imap.LastMethodSuccess = 0) then
      begin
        Memo1.Lines.Add(imap.LastErrorText);

        Exit;

      end
    else
      begin
        // Do whatever is needed with the email.. 
        // ....

      end;

    i := i + 1;
  end;

// Alternatively, create a new message set containing the 1st 10 message id's (UID's) 
// from the search results message set:
firstTen := TMessageSet.Create(Self);

for i := 0 to upperBound - 1 do
  begin
    firstTen.InsertId(messageSet.GetId(i));
  end;

// Download the 1st ten headers:

bundle := imap.FetchHeaders(firstTen.ControlInterface);
if (imap.LastMethodSuccess = 0) then
  begin

    Memo1.Lines.Add(imap.LastErrorText);
    Exit;
  end;

// Other examples show how to iterate over the emails contained within the bundle...

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