如何向 Telegram 主题（子组）发送消息？

Question

我想向主题发送消息，但我在 GitLab issues 和官方文档中没有找到方法。

from datetime import datetime

from telethon import TelegramClient
from telethon.tl.custom import Dialog
from telethon.tl.functions.channels import GetForumTopicsRequest
from telethon.tl.types import PeerChannel, ForumTopic, InputPeerChannel
from telethon.tl.types.messages import ForumTopics


async def main(client: TelegramClient):
    async for dialog in client.iter_dialogs():  # type: Dialog
        if not dialog.is_group:
            continue

        print(f"\n{dialog.id=} {dialog.name=}")
        if dialog.is_channel and dialog.entity.forum:
            input_peer_channel: InputPeerChannel = await client.get_input_entity(PeerChannel(dialog.entity.id))
            topics_request = GetForumTopicsRequest(
                channel=input_peer_channel, offset_date=datetime.now(), offset_id=-1, offset_topic=-1, limit=50
            )
            forum_topics: ForumTopics = await client(topics_request)
            for topic in forum_topics.topics:  # type: ForumTopic
                print(f"\t{topic.id=} {topic.title=}")
                # QUESTION: How can I send message to the topic?

if __name__ == '__main__':
    api_id = 123
    api_hash = '123...456'
    telegram_client = TelegramClient('user', api_id, api_hash)

    with telegram_client:
        telegram_client.loop.run_until_complete(main(telegram_client))

向 telegram 子群发送消息的方法

Answer 1

非常感谢@Lomami 的提示，解决了我的问题：

from datetime import datetime

from telethon import TelegramClient
from telethon.tl.custom import Dialog
from telethon.tl.functions.channels import GetForumTopicsRequest, GetForumTopicsByIDRequest
from telethon.tl.types import PeerChannel, ForumTopic, InputPeerChannel, Message
from telethon.tl.types.messages import ForumTopics


async def main(client: TelegramClient):
    async for dialog in client.iter_dialogs():  # type: Dialog
        if not dialog.is_group:
            continue

        print(f"\n{dialog.id=} {dialog.name=}")
        if dialog.is_channel and dialog.entity.forum:
            input_peer_channel: InputPeerChannel = await client.get_input_entity(PeerChannel(dialog.entity.id))
            topics_request = GetForumTopicsRequest(
                channel=input_peer_channel, offset_date=datetime.now(), offset_id=-1, offset_topic=-1, limit=50
            )
            forum_topics: ForumTopics = await client(topics_request)
            for topic in forum_topics.topics:  # type: ForumTopic
                print(f"\t{topic.id=} {topic.title=}")
                
                # This block was solved my issue
                entity: ForumTopics = await client(GetForumTopicsByIDRequest(channel=dialog.entity, topics=[topic.id]))
                channel: InputPeerChannel = await client.get_input_entity(PeerChannel(entity.chats[0].id))
                message: Message = await client.send_message(channel, "Hi there!", reply_to=topic.id)
                print(message.id)

if __name__ == '__main__':
    api_id = 123
    api_hash = '123...456'
    telegram_client = TelegramClient('user', api_id, api_hash)

    with telegram_client:
        telegram_client.loop.run_until_complete(main(telegram_client))