(Delphi DLL) 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 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, Email, MessageSet;

...

procedure TForm1.Button1Click(Sender: TObject);
var
imap: HCkImap;
success: Boolean;
messageSet: HCkMessageSet;
fetchUids: Boolean;
numFound: Integer;
upperBound: Integer;
i: Integer;
bUid: Boolean;
email: HCkEmail;
firstTen: HCkMessageSet;
bundle: HCkEmailBundle;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

imap := CkImap_Create();

// Connect to an IMAP server.
// Use TLS
CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);
success := CkImap_Connect(imap,'imap.someMailServer.com');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

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

// Select an IMAP mailbox
success := CkImap_SelectMailbox(imap,'Inbox');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// We can choose to fetch UIDs or sequence numbers.
fetchUids := True;
// Get the message IDs of all the emails in the mailbox
messageSet := CkImap_Search(imap,'ALL',fetchUids);
if (CkImap_getLastMethodSuccess(imap) = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

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

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

i := 0;
bUid := CkMessageSet_getHasUids(messageSet);
while i < upperBound do
  begin

    email := CkImap_FetchSingleHeader(imap,CkMessageSet_GetId(messageSet,i),bUid);
    if (CkImap_getLastMethodSuccess(imap) = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        CkMessageSet_Dispose(messageSet);
        Exit;

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

        CkEmail_Dispose(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 := CkMessageSet_Create();

for i := 0 to upperBound - 1 do
  begin
    CkMessageSet_InsertId(firstTen,CkMessageSet_GetId(messageSet,i));
  end;

CkMessageSet_Dispose(messageSet);

// Download the 1st ten headers:

bundle := CkImap_FetchHeaders(imap,firstTen);
if (CkImap_getLastMethodSuccess(imap) = False) then
  begin
    CkMessageSet_Dispose(firstTen);
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

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

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

CkMessageSet_Dispose(firstTen);
CkEmailBundle_Dispose(bundle);

CkImap_Dispose(imap);
CkMessageSet_Dispose(firstTen);

end;