I am trying to detect which message is edited or deleted on a subscribed channel on telegram with TLSharp library in c#.
1- in a while(true) loop I am getting latest updates.
2- when I delete or edit a message for test, I receive TLUpdateChannelTooLong only.
3- then I use client.GetHistoryAsync function to get channel messages, and check their EditDate.
But I don't know how much should I go deep in history and I can not find deleted message with this code easily.
Is there any solution to find deleted/edited messages easy and safe?
Part of my code:
state = await client.SendRequestAsync<TLState>(new TLRequestGetState());
while (true)
{
await Task.Delay(1000);
var req = new TLRequestGetDifference() { Date = state.Date, Pts = state.Pts, Qts = state.Qts };
TLDifference diff = null;
try
{
diff = await client.SendRequestAsync<TLAbsDifference>(req) as TLDifference;
}
catch (Exception ex)
{
HandleThisException(ex);
}
//--
if (diff != null)
{
state = await client.SendRequestAsync<TLState>(new TLRequestGetState());
foreach (var upd in diff.OtherUpdates.OfType<TLUpdateNewChannelMessage>())
{
var tm = (upd.Message as TLMessage);
if (tm == null) { continue; } // ?
var textMessage = tm.Message;
if (tm.Media != null)
{
if (tm.Media.GetType().ToString() == "TeleSharp.TL.TLMessageMediaPhoto")
{
var tLMessageMediaPhoto = (tm.Media as TLMessageMediaPhoto);
textMessage = tLMessageMediaPhoto.Caption;
}
}
try
{
var from = (tm.ToId as TLPeerChannel).ChannelId;
long replyTo = tm.ReplyToMsgId == null ? 0 : (long)tm.ReplyToMsgId;
await AnalyzeNewMessage( ... );
}
catch (Exception exParsing)
{
HandleThisException(exParsing);
}
}
// Checking Edited/Deleted Messages
foreach(var upLong in diff.OtherUpdates.OfType<TLUpdateChannelTooLong>())
{
TLChannel theChat = null;
foreach(var chat in diff.Chats.OfType<TLChannel>())
{
if(chat.Id == upLong.ChannelId) { theChat = chat; break; }
}
if (theChat != null)
{
var x = await client.GetHistoryAsync(
new TLInputPeerChannel { ChannelId = theChat.Id, AccessHash = (long)theChat.AccessHash },
0,-1,2
); // checking only 2 last messages!
var ChMsgs = x as TLChannelMessages;
foreach (var msg in ChMsgs.Messages.OfType<TLMessage>())
{
if(msg.EditDate != null)
{
var txt = msg.Message;
if (msg.Media != null)
{
if (msg.Media.GetType().ToString() == "TeleSharp.TL.TLMessageMediaPhoto")
{
txt = (msg.Media as TLMessageMediaPhoto).Caption;
}
}
await AnalyzeEditedMessage( ... );
}
}
}
}
}
}