How to listen new message / use handle update?

[munrocket]

According to #361 #43 right way to get new messages is TLRequestGetDifference or HandleUpdate usage. Also we can find official manual about processing updates: https://core.telegram.org/api/updates
Here we need an source code example. Same questions: #564 #239 #436 #457 #524 #538 #547 #570

[munrocket]

If you need to catch new message from user or group after authorizing, you can check status in simple loop without getting FLOOD_EXCEPTION. But this not working with channels.

while (true) {
   var state = await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
   if (state.unread_count > 0) { ... }
   await Task.Delay(500);
}

[munrocket]

In general you need to create test channel, test group and second user and check whats happends with this code pattern (or try to use PUSH notification https://core.telegram.org/api/push-updates with TeleSharp.TL.Account.TLRequestRegisterDevice). General testing pattern:

while (true)
{
    var state = await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
    var req = new TLRequestGetDifference() { date = state.date, pts = state.pts, qts = state.qts };
    var adiff = await telegram.SendRequestAsync<TLAbsDifference>(req);
    if (!(adiff is TLDifferenceEmpty))
    {
        if (adiff is TLDifference)
        {
            var diff = adiff as TLDifference;
            Console.WriteLine("chats:" + diff.chats.lists.Count);
            Console.WriteLine("encrypted:" + diff.new_encrypted_messages.lists.Count);
            Console.WriteLine("new:" + diff.new_messages.lists.Count);
            Console.WriteLine("user:" + diff.users.lists.Count);
            Console.WriteLine("other:" + diff.other_updates.lists.Count);
        }
        else if (adiff is TLDifferenceTooLong)
            Console.WriteLine("too long");
        else if (adiff is TLDifferenceSlice)
            Console.WriteLine("slice");
    }
    await Task.Delay(500);
}

[munrocket]

Finnaly I use this code for reading my channels and mark message as read

while (true)
{
    var state = await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
    var req = new TLRequestGetDifference() { date = state.date, pts = state.pts, qts = state.qts };
    var diff = await telegram.SendRequestAsync<TLAbsDifference>(req) as TLDifference;
    if (diff != null)
    {
        foreach (var upd in diff.other_updates.lists.OfType<TLUpdateNewChannelMessage>())
            Console.WriteLine((upd.message as TLMessage).message);

        foreach(var ch in diff.chats.lists.OfType<TLChannel>().Where(x => !x.left))
        {
            var ich = new TLInputChannel() { channel_id = ch.id, access_hash = (long)ch.access_hash };
            var readed = new TeleSharp.TL.Channels.TLRequestReadHistory() { channel = ich, max_id = -1 };
            await telegram.SendRequestAsync<bool>(readed);
        }
    }
    await Task.Delay(500);
}

[Rman77]

        while (true)
        {
            var state = await client.SendRequestAsync<TLState>(new TLRequestGetState());
            var req = new TLRequestGetDifference() { date = state.date, pts = state.pts, qts = state.qts };
            var diff = await client.SendRequestAsync<TLAbsDifference>(req) as TLDifference;

            if (diff != null) {
                foreach (var x in diff.new_messages.lists.OfType<TLUpdateNewMessage>())
                {
                    listBox1.Items.Add((x.message as TLMessage).message);
                }
            }
            await Task.Delay(500);
        }

why my code doesn't work ? @mirror-neuron

[snrchang]

so "upd.message as TLMessage).message" get you the message but how would u get a photo in the message or know what channel the message came from?
Please help a brother out.

[snrchang]

munrocket thats nothing to do with the question i asked sir.

[snrchang]

while (true)
{
var state = await telegram.SendRequestAsync(new TLRequestGetState());
var req = new TLRequestGetDifference() { date = state.date, pts = state.pts, qts = state.qts };
var diff = await telegram.SendRequestAsync(req) as TLDifference;
if (diff != null)
{
foreach (var upd in diff.other_updates.lists.OfType())
Console.WriteLine((upd.message as TLMessage).message);

    foreach(var ch in diff.chats.lists.OfType<TLChannel>().Where(x => !x.left))
    {
        var ich = new TLInputChannel() { channel_id = ch.id, access_hash = (long)ch.access_hash };
        var readed = new TeleSharp.TL.Channels.TLRequestReadHistory() { channel = ich, max_id = -1 };
        await telegram.SendRequestAsync<bool>(readed);
    }
}
await Task.Delay(500);

}
This code is ideal but i would like to accept photos and get the name of the channel of the incoming message.

thanks

[GodSpeedXI]

Someone Please give me an example how to use TLRequestRegisterDevice.
I want to get notify when messages are coming from every chat.

I try to use something like this.

var tlRequestRegisterDevice = new TLRequestRegisterDevice(){ TokenType = 2, Token = _hash};
var notify = await _telegramClient.SendRequestAsync<TLMethod>(_tlRequestRegisterDevice);

Thanks.

[RiddlerKnight]

Hello I have tried this code so many times.

var state = await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
var req = new TLRequestGetDifference() { date = state.date, pts = state.pts, qts = state.qts };
var diff = await telegram.SendRequestAsync<TLAbsDifference>(req) as TLDifference;

And I found that diff will be returned "TLDifferenceEmpty" always.

[Arvezz]

Does anyone know why why compiler cant find "lists"? I am trying read last message

[amirvenus]

@ProjektAI

try to use .ToList() instead

[Maverick1983]

@pisitch I have same problem. Anyone resolve it?

[J1herm]

Ok I'm getting a few grey hairs now..

I am wanting to forward messages between groups. User sets up which group forwards to whom.

so select from group from drop down, and select to group. then config that from that point going forward all new messages are automatically forwarded from the one group to the other..

I am able to get the user to select To and From group and forward the last message sent to the from group gets forwarded to the To group with this code

   var tlAbsMessages = await client.GetHistoryAsync(new TLInputPeerChat { ChatId = chat1.Id }, 0, -1,  50 );
                    var tlChatMessage = (TLMessages)tlAbsMessages;
                    var tlAbsMessage = tlChatMessage.Messages.ToList()[0];
                    var message = (TLMessage)tlAbsMessage;
                    messageID = message.Id;


   //Request for Forward: 
                    TLRequestForwardMessages rq = new TLRequestForwardMessages();
                    rq.FromPeer = new TLInputPeerChat() { ChatId = chat2.Id };
                    rq.ToPeer = new TLInputPeerChat() { ChatId = chat1.Id };


                    TLVector<long> rn = new TLVector<long>();
                    TLVector<int> idd = new TLVector<int>();

                    rn.Add(rnd.Next(1000, 5000));
                    // messageID is the last post ID of the channel or group the last messages posted's ID
                    idd.Add(messageID); 
                    rq.RandomId = rn;
                    rq.MessageId = messageID; 
                    rq.Id = idd;
                    rq.Silent = true;
                    rq.WithMyScore = true;

                    TLUpdates rr = await client.SendRequestAsync<TLUpdates>(rq);

But now I am at the point where I want to forward any new messages received on the from group to that To group as well.

 var state = await client.SendRequestAsync<TLState>(new TLRequestGetState());
                var req = new TLRequestGetDifference() { Date = state.Date, Pts = state.Pts, Qts = state.Qts };
                var adiff = await client.SendRequestAsync<TLAbsDifference>(req) as TLDifference;

not sure how to hook this up to listen for new messages on a particular group to forward.
maybe I am on the wrong track
any help /direction will be much be appreciated...

[munrocket]

But now I am at the point where I want to forward any new messages received on the from group to that To group as well.

As i know sending message much easier than listen updates. Try with sipmle message and another user at first.

[aroaddy]

If you need to catch new message from user or group after authorizing, you can check status in simple loop without getting FLOOD_EXCEPTION. But this not working with channels.

while (true) {
   var state = await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
   if (state.unread_count > 0) { ... }
   await Task.Delay(500);
}

Hello please i would like to know where to paste this code, how do I implement in a way that it always listens for a new message.

[Trinitron]

@munrocket I want just simply track incoming messages from certain user. Why using this peace of code in while loop i miss approximately 5/6 of incoming messages? where are the rest?
await telegram.SendRequestAsync<TLState>(new TLRequestGetState());
Do i need subract 500ms from Date property of TLRequestGetDifference or how?

[munrocket]

@Trinitron just use telethon and relax, TLSharp has an annoying verbouse api.

[Trinitron]

If someone still uses this library and struggling between unobvious exceptions here is my small example how to listen incomming telegram messages:
_lastMessageStamp = (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;

            while (true)
            {
                var state = await _client.SendRequestAsync<TLState>(new TLRequestGetState());
                TrackingState = state.Pts.ToString();
                var req = new TLRequestGetDifference() { Date = state.Date, Pts = state.Pts-10, Qts = state.Qts };
                var diff = await _client.SendRequestAsync<TLAbsDifference>(req);
                var msgs = diff as TLDifference;
                if (msgs!=null && msgs.NewMessages.Count>0)
                {
                    var mss = msgs.NewMessages.Where(x => x.GetType() == typeof(TLMessage))
                        .Cast<TLMessage>().ToList().Where(x => x.Date > _lastMessageStamp && x.Out == false)
                        .OrderBy(dt => dt.Date);

                    foreach (TLMessage upd in mss)
                    {
                        Console.WriteLine("New message ({0}): {1}", upd.Date, upd.Message);
                    }
                    _lastMessageStamp = mss.Any() ? mss.Max(x => x.Date) : _lastMessageStamp;
                }
                await Task.Delay(2500);
            }

state.Pts-10 shows that i need only 10 last messages;

[asensionacher]

_lastMessageStamp = (Int32)(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1))).TotalSeconds;

I always receive TLDifferenceEmpty, do you know why?

[RomanSoloweow]

            while (true)
            {
                var state = await _Client.SendRequestAsync<TLState>(new TLRequestGetState());
                if(state.UnreadCount>0)
                {
                    var req = new TLRequestGetDifference() { Date = state.Date, Pts = state.Pts-state.UnreadCount, Qts = state.Qts, Sequence = state.Seq};
                    var diff = await _Client.SendRequestAsync<TLAbsDifference>(req) as TLDifference;
                }
                
                await Task.Delay(500);
            }

state.Pts-state.UnreadCount - it's solve

[Invectys]

ModernTLSharp solve this problem

[knocte]

... solves this problem

Also this PR: #940 can anyone test it please?