Delphi DLL

Imap.GetMailSize vs Email.Size

Shows how to get the total size of an email, as well as the sizes of the attachments. This can be done when either full-emails or headers-only are downloaded. Delphi 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
success: Boolean;
imap: HCkImap;
fetchUids: Boolean;
messageSet: HCkMessageSet;
bundle: HCkEmailBundle;
headersOnly: Boolean;
email: HCkEmail;
i: Integer;
j: Integer;
numEmails: Integer;
numAttach: Integer;
attachSize: Integer;

begin
success := False;

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

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

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

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

// Loop over the email objects and display information about each:
email := CkEmail_Create();
i := 0;
j := 0;
numEmails := CkEmailBundle_getMessageCount(bundle);
while i < numEmails do
  begin
    CkEmailBundle_EmailAt(bundle,i,email);

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

    // Display the recipients:
    j := 0;
    while j < CkEmail_getNumTo(email) do
      begin
        Memo1.Lines.Add('TO: ' + CkEmail__getToName(email,j) + ', ' + CkEmail__getToAddr(email,j));
        j := j + 1;
      end;

    j := 0;
    while j < CkEmail_getNumCC(email) do
      begin
        Memo1.Lines.Add('CC: ' + CkEmail__getCcName(email,j) + ', ' + CkEmail__getCcAddr(email,j));
        j := j + 1;
      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);
    j := 0;
    while j < numAttach do
      begin
        Memo1.Lines.Add(CkImap__getMailAttachFilename(imap,email,j));
        attachSize := CkImap_GetMailAttachSize(imap,email,j);
        Memo1.Lines.Add('    size = ' + IntToStr(attachSize) + ' bytes');
        j := j + 1;
      end;

    Memo1.Lines.Add('--');

    i := i + 1;
  end;

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

CkImap_Dispose(imap);
CkMessageSet_Dispose(messageSet);
CkEmailBundle_Dispose(bundle);
CkEmail_Dispose(email);

end;