c# - Telegram API（不是 Telegram Bot API！） - 如何获取整个聊天/频道中的所有消息？

Question

1. 我需要在聊天中获取所有消息。我使用 C# 和 TLSharp 库。

2. 我授权，成功获得令牌等。

3. 但是当我试图在一个循环中获取消息时，我将进入一个无限循环。

4. 所以带有结果的文本永远不会出现在文本框中。我想知道我做错了什么以及如何解决它。谢谢。

   using TeleSharp.TL;
   using TeleSharp.TL.Messages;
   using TLSharp.Core;
   //using other standard...
   
   //code for authorization etc. is skipped
   
    int VKFID = 1175259547; //ID of the chat
    int offset = 0;
    int n = 1;
    StringBuilder sb = new StringBuilder();
    TelegramClient client = new TelegramClient(<key>, <hash>);
    TLUser user;
   
    private DateTime ConvertFromUnixTimestamp(double timestamp)
    {
        DateTime origin = new DateTime(1970, 1, 1, 0, 0, 0, 0);
        return origin.AddSeconds(timestamp);
    }
   
    private async void button3_Click(object sender, EventArgs e)
    {
        sb.Append("#\tDate\tTime\tMID\tTUID\tText" + Environment.NewLine);
        TLDialogsSlice dialogs = (TLDialogsSlice)await client.GetUserDialogsAsync();
        TLChannel chat = dialogs.Chats.Where(c => c.GetType() == typeof(TLChannel)).Cast<TLChannel>().FirstOrDefault(c => c.Id == VKFID);
        TLInputPeerChannel inputPeer = new TLInputPeerChannel() { ChannelId = chat.Id, AccessHash = (long)chat.AccessHash };
        while (true)
        {
            try
            {
                TLChannelMessages res = await client.SendRequestAsync<TLChannelMessages>
                (new TLRequestGetHistory() { Peer = inputPeer, Limit = 1000, AddOffset = offset, OffsetId = 0 });
                var msgs = res.Messages;
                if (res.Count > offset)
                {
                    offset += msgs.Count;
                    foreach (TLAbsMessage msg in msgs)
                    {
                        if (msg is TLMessage)
                        {
                            TLMessage message = msg as TLMessage;
                            sb.Append(n.ToString() + "\t" +
                                ConvertFromUnixTimestamp(message.Date).ToLocalTime().ToString("dd'.'MM'.'yyyy") + "\t" +
                                ConvertFromUnixTimestamp(message.Date).ToLocalTime().ToString("HH':'mm':'ss") + "\t" +
                                message.Id + "\t" + message.FromId + "\t" + message.Message + Environment.NewLine);
                        }
                        if (msg is TLMessageService)
                            continue;
                        n++;
                    }
                    Thread.Sleep(22000); //to avoid TelegramFloodException
                }
                else
                    break;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                break;
            }
            finally
            {
                await Task.Delay(22000); //to avoid TelegramFloodException
            }
        }
        textBox2.Text = sb.ToString();
        MessageBox.Show("Done");
    }
   

Answer 1

现在有WTelegramClient库，使用最新的 Telegram Client API 协议（以用户身份连接，而不是机器人）。

该库非常完整，但使用起来也非常简单。按照GitHub 上的 README进行简单介绍。

连接、查找您的聊天和检索所有消息可以这样完成：

using TL;
using System.Linq;

const int TargetChatId = 1175259547;

using var client = new WTelegram.Client(); // or Client(Environment.GetEnvironmentVariable)
await client.LoginUserIfNeeded();
var chats = await client.Messages_GetAllChats(null);
InputPeer peer = chats.chats.First(chat => chat.ID == TargetChatId);
for (int offset = 0; ;)
{
    var messagesBase = await client.Messages_GetHistory(peer, 0, default, offset, 1000, 0, 0, 0);
    if (messagesBase is not Messages_ChannelMessages channelMessages) break;
    foreach (var msgBase in channelMessages.messages)
        if (msgBase is Message msg)
        {
            // process the message
        }
    offset += channelMessages.messages.Length;
    if (offset >= channelMessages.count) break;
}

Answer 2

您可以尝试在 Thead.Sleep(22000) 之前刷新您的文本框吗？

    textBox2.Text += sb.ToString();
    Application.DoEvents();
    Thread.Sleep(22000);

执行此操作的其他方式可以是使用 BackgroundWorker，其方式与用于管理 ProgressBar 的方式相同。