(Delphi DLL) Read IMAP Email Headers

Call FetchHeaders to download only the email headers.

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;
bundle: HCkEmailBundle;
i: Integer;
email: HCkEmail;
j: Integer;
name: PWideChar;
addr: PWideChar;
numAttach: Integer;
attachSize: Integer;

begin
// This example requires 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) <> True) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// When downloading headers, each email object contains
// (obviously) the headers, but the body will be missing.
// Also, attachments will not be included.  However, it is
// possible to get information about the attachments
// as well as the complete size of the email.

bundle := CkImap_FetchHeaders(imap,messageSet);
if (CkImap_getLastMethodSuccess(imap) <> True) then
  begin
    CkMessageSet_Dispose(messageSet);
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

// Loop over the email objects and display information
// about each:

for i := 0 to CkEmailBundle_getMessageCount(bundle) - 1 do
  begin

    email := CkEmailBundle_GetEmail(bundle,i);

    // Display the From and Subject
    Memo1.Lines.Add(CkEmail__from(email));
    Memo1.Lines.Add(CkEmail__subject(email));

    // Display the recipients:

    for j := 0 to CkEmail_getNumTo(email) - 1 do
      begin
        name := CkEmail__getToName(email,j);
        addr := CkEmail__getToAddr(email,j);
        Memo1.Lines.Add(name + ', ' + addr);
      end;

    for j := 0 to CkEmail_getNumCC(email) - 1 do
      begin
        name := CkEmail__getCcName(email,j);
        addr := CkEmail__getCcAddr(email,j);
        Memo1.Lines.Add(name + ', ' + addr);
      end;

    // Show the total size of the email, including body and attachments:
    Memo1.Lines.Add(IntToStr(CkEmail_getSize(email)));

    // When a full email is downloaded, we would use the
    // email.NumAttachments property in conjunction with the
    // email.GetMailAttach* methods.
    // However, when an email object contains only the header,
    // we need to access the attachment info differently:
    numAttach := CkImap_GetMailNumAttach(imap,email);
    for j := 0 to numAttach - 1 do
      begin
        Memo1.Lines.Add(CkImap__getMailAttachFilename(imap,email,j));
        attachSize := CkImap_GetMailAttachSize(imap,email,j);
        Memo1.Lines.Add('    size = ' + IntToStr(attachSize) + ' bytes');
      end;

    Memo1.Lines.Add('--');
    CkEmail_Dispose(email);
  end;

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

CkMessageSet_Dispose(messageSet);
CkEmailBundle_Dispose(bundle);

CkImap_Dispose(imap);

end;