IdPOP3, IdMessage and attachment gmail - attachment

Question

I need help, please. I can connect to Gmail and I can receive emails.
What I can't do is to save attachments. I think that it is a setting problem? I have IdAttachment and IdAttachmentFile in my uses clause. I tried all sorts of ContentType settings, but nothing seams to work.
if (IdMessage1.MessageParts.Items[i] is TIdAttachment) then
begin
with (IdMessage1.MessageParts.Items[i] as TIdAttachment) do
begin
SaveToFile('C:\test123.txt');
end;
end;
Here is my code:
procedure TForm1.Button1Click(Sender: TObject);
var
i, j: Integer;
IdSSLIOHandlerSocket: TIdSSLIOHandlerSocketOpenSSL;
bodytext: string;
s: string;
n: string;
mailcount : integer;
TMP: string;
begin
IdSSLIOHandlerSocket := TIdSSLIOHandlerSocketOpenSSL.Create(Self);
idpop31.IOHandler := IdSSLIOHandlerSocket;
idpop31.UseTLS := utUseImplicitTLS;
IdPOP31.Host := 'pop.gmail.com';
IdPOP31.Port := 995;
IdPOP31.UseTLS := utUseImplicitTLS;
IdPOP31.Username := 'name#gmail.com';
IdPOP31.Password := 'xxxxx';
IdPOP31.Connect;
Mailcount:= idpop31.checkmessages;
For i:= 1 to mailcount do
Begin
Idmessage1.clear;
Idpop31.retrieveheader (i,idmessage1);
TMP:= idmessage1.subject;
Mailzeug.lines. Add (TMP);
Idpop31.retrieve (i,idmessage1);
TMP:= idmessage1.body.Text;
Mailzeug.lines. Add (TMP);
if (IdMessage1.MessageParts.Items[i] is TIdAttachment) then
begin
TIdAttachment(IdMessage1.MessageParts.Items[i]).SaveToFile(TIdAttachment(IdMessage1.MessageParts.Items[I]).Filename);
end;
end;
Idpop31.disconnect;
end;

Answer 1

You are using the wrong index value with the IdMessage1.MessageParts.Items[] property, that is why you are getting an "out of range" error. You are using the email's (1-based) index within the mailbox as-if it were a (0-based) attachment index within the email.
You need a 2nd loop to iterate the MessageParts collection of each email that is downloaded, eg:
procedure TForm1.Button1Click(Sender: TObject);
var
i, j: Integer;
IdSSLIOHandlerSocket: TIdSSLIOHandlerSocketOpenSSL;
BodyText: string;
MailCount : integer;
part: TIdMessagePart;
begin
IdSSLIOHandlerSocket := TIdSSLIOHandlerSocketOpenSSL.Create(Self);
IdPOP31.IOHandler := IdSSLIOHandlerSocket;
IdPOP31.Host := 'pop.gmail.com';
IdPOP31.Port := 995;
IdPOP31.UseTLS := utUseImplicitTLS;
IdPOP31.Username := 'name#gmail.com';
IdPOP31.Password := 'xxxxx';
IdPOP31.Connect;
try
MailCount := IdPOP31.CheckMessages;
for i := 1 to MailCount do
begin
IdMessage1.Clear;
IdPOP31.Retrieve(i, IdMessage1);
Mailzeug.Lines.Add(IdMessage1.Subject);
BodyText := IdMessage1.Body.Text;
Mailzeug.Lines.Add(BodyText);
for j := 0 to IdMessage1.MessagePart.Count-1 do
begin
part := IdMessage1.MessageParts.Items[j];
if (part is TIdAttachment) then
begin
TIdAttachment(part).SaveToFile(TIdAttachment(part).Filename);
end;
end;
end;
finally
IdPOP31.Disconnect;
end;
end;