如何用Pyrogram向指定Telegram Forum Topic发送消息？

我需要向Forum Topic发送消息，现有以下代码：

from pyrogram import Client, filters
from pyrogram.raw import functions,types
app = Client("my_account", api_id="12345678", api_hash="g8u4h894urgh09eurhiugfdgfrgrg")
async def get_chat_themes(client):
    result = await app.invoke(
        functions.messages.SendMessage(peer =types.InputPeerChannel(channel_id=12345,access_hash=-1234),message ="Test",random_id =-1)
    )
    print(result)

with app:
    app.loop.run_until_complete(get_chat_themes(app))

该代码会将消息发送至#General主题，请问如何将消息发送到其他主题？调用GetForumTopics接口得到如下输出：

{
    "_": "types.messages.ForumTopics",
    "count": 1,
    "topics": [
        {
            "_": "types.ForumTopic",
            "id": 12,
            "date": 1688764942,
            "title": "1",
            "icon_color": 16766590,
            "top_message": 12,
            "read_inbox_max_id": 13,
            "read_outbox_max_id": 0,
            "unread_count": 0,
            "unread_mentions_count": 0,
            "unread_reactions_count": 0,
            "from_id": {
                "_": "types.PeerUser",
                "user_id": 
            },
            "notify_settings": {
                "_": "types.PeerNotifySettings"
            },
            "my": true,
            "closed": false,
            "pinned": false,
            "short": false,
            "hidden": false
        },
        {
            "_": "types.ForumTopic",
            "id": 1,
            "date": 1688762115,
            "title": "General",
            "icon_color": 7322096,
            "top_message": 3,
            "read_inbox_max_id": 9,
            "read_outbox_max_id": 9,
            "unread_count": 0,
            "unread_mentions_count": 0,
            "unread_reactions_count": 0,
            "from_id": {
                "_": "types.PeerChannel",
                "channel_id": 
            },
            "notify_settings": {
                "_": "types.PeerNotifySettings"
            },
            "my": true,
            "closed": false,
            "pinned": false,
            "short": false,
            "hidden": false
        }
    ],
    "messages": [
        {
            "_": "types.MessageService",
            "id": 12,
            "peer_id": {
                "_": "types.PeerChannel",
                "channel_id": 
            },
            "date": 1688764942,
            "action": {
                "_": "types.MessageActionTopicCreate",
                "title": "1",
                "icon_color": 16766590
            },
            "out": true,
            "mentioned": false,
            "media_unread": false,
            "silent": false,
            "post": false,
            "legacy": false,
            "from_id": {
                "_": "types.PeerUser",
                "user_id": 
            }
        },
        {
            "_": "types.MessageService",
            "id": 3,
            "peer_id": {
                "_": "types.PeerChannel",
                "channel_id": 
            },
            "date": 1688762477,
            "action": {
                "_": "types.MessageActionChatAddUser",
                "users": [
                    
                ]
            },
            "out": true,
            "mentioned": false,
            "media_unread": false,
            "silent": false,
            "post": false,
            "legacy": false,
            "from_id": {
                "_": "types.PeerUser",
                "user_id": 
            }
        }
    ],
    "chats": [
        {
            "_": "types.Channel",
            "id": ,
            "title": "",
            "photo": {
                "_": "types.ChatPhotoEmpty"
            },
            "date": 1688762115,
            "creator": true,
            "left": false,
            "broadcast": false,
            "verified": false,
            "megagroup": true,
            "restricted": false,
            "signatures": false,
            "min": false,
            "scam": false,
            "has_link": false,
            "has_geo": false,
            "slowmode_enabled": false,
            "call_active": false,
            "call_not_empty": false,
            "fake": false,
            "gigagroup": false,
            "noforwards": false,
            "join_to_send": false,
            "join_request": false,
            "forum": true,
            "access_hash": -,
            "restriction_reason": [],
            "admin_rights": {
                "_": "types.ChatAdminRights",
                "change_info": true,
                "post_messages": true,
                "edit_messages": true,
                "delete_messages": true,
                "ban_users": true,
                "invite_users": true,
                "pin_messages": true,
                "add_admins": true,
                "anonymous": false,
                "manage_call": true,
                "other": true,
                "manage_topics": true
            },
            "default_banned_rights": {
                "_": "types.ChatBannedRights",
                "until_date": 2147483647,
                "view_messages": false,
                "send_messages": false,
                "send_media": false,
                "send_stickers": false,
                "send_gifs": false,
                "send_games": false,
                "send_inline": false,
                "embed_links": false,
                "send_polls": false,
                "change_info": false,
                "invite_users": false,
                "pin_messages": false,
                "manage_topics": false,
                "send_photos": false,
                "send_videos": false,
                "send_roundvideos": false,
                "send_audios": false,
                "send_voices": false,
                "send_docs": false,
                "send_plain": false
            },
            "usernames": []
        }
    ],
    "users": [
        {
            "_": "types.User",
            "id": ,
            "is_self": true,
            "contact": false,
            "mutual_contact": false,
            "deleted": false,
            "bot": false,
            "bot_chat_history": false,
            "bot_nochats": false,
            "verified": false,
            "restricted": false,
            "min": false,
            "bot_inline_geo": false,
            "support": false,
            "scam": false,
            "apply_min_photo": true,
            "fake": false,
            "bot_attach_menu": false,
            "premium": false,
            "attach_menu_enabled": false,
            "bot_can_edit": false,
            "access_hash": ,
            "first_name": "",
            "username": "",
            "phone": "",
            "status": {
                "_": "types.UserStatusOffline",
                "was_online": 
            },
            "restriction_reason": [],
            "usernames": []
        },
        {
            "_": "types.User",
            "id": ,
            "is_self": false,
            "contact": false,
            "mutual_contact": false,
            "deleted": false,
            "bot": true,
            "bot_chat_history": false,
            "bot_nochats": false,
            "verified": false,
            "restricted": false,
            "min": false,
            "bot_inline_geo": false,
            "support": false,
            "scam": false,
            "apply_min_photo": true,
            "fake": false,
            "bot_attach_menu": false,
            "premium": false,
            "attach_menu_enabled": false,
            "bot_can_edit": true,
            "access_hash": ,
            "first_name": "Test",
            "username": "Testrobot123_robot",
            "bot_info_version": 1,
            "restriction_reason": [],
            "usernames": []
        }
    ],
    "pts": 26,
    "order_by_create_date": false
}

我查阅文档后仅找到functions.messages.SendMessage方法，请问是否有解决方案？也可考虑使用其他库。

方法一：基于Pyrogram底层API修改 #

在functions.messages.SendMessage中添加reply_to_msg_id参数，指定目标主题的top_message值即可。从你提供的接口输出里，目标主题（title为"1"）的top_message是12，修改代码如下：

from pyrogram import Client
from pyrogram.raw import functions,types
app = Client("my_account", api_id="12345678", api_hash="g8u4h894urgh09eurhiugfdgfrgrg")
async def send_to_topic(client):
    result = await app.invoke(
        functions.messages.SendMessage(
            peer=types.InputPeerChannel(channel_id=12345, access_hash=-1234),
            message="Test",
            random_id=-1,
            reply_to_msg_id=12  # 填入目标主题的top_message值
        )
    )
    print(result)

with app:
    app.loop.run_until_complete(send_to_topic(app))

方法二：使用Pyrogram高层API（更简洁） #

Pyrogram的高层API已封装论坛主题消息发送逻辑，直接调用app.send_message并指定forum_topic_id参数即可，无需手动处理底层参数：

from pyrogram import Client
app = Client("my_account", api_id="12345678", api_hash="g8u4h894urgh09eurhiugfdgfrgrg")

with app:
    # chat_id为频道完整ID（以-100开头），forum_topic_id为目标主题的id（比如12）
    app.send_message(chat_id=-10012345, text="Test", forum_topic_id=12)

频道完整ID可从GetForumTopics返回的chats数组中，将id值前加上-100得到。

其他库选项：python-telegram-bot（v20+） #

如果考虑更换库，python-telegram-bot的新版本也支持论坛主题消息发送：

from telegram import Bot
import asyncio

async def main():
    bot = Bot(token="YOUR_BOT_TOKEN")
    # chat_id为频道ID，message_thread_id为主题id
    await bot.send_message(chat_id=-10012345, text="Test", message_thread_id=12)

asyncio.run(main())

内容的提问来源于stack exchange，提问作者Hack337