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	🔖 Release 2.3.1
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| --- | ||||
| sidebar_position: 2 | ||||
| description: nonebot.message 模块 | ||||
| --- | ||||
|  | ||||
| # nonebot.message | ||||
|  | ||||
| 本模块定义了事件处理主要流程。 | ||||
|  | ||||
| NoneBot 内部处理并按优先级分发事件给所有事件响应器,提供了多个插槽以进行事件的预处理等。 | ||||
|  | ||||
| ## _def_ `event_preprocessor(func)` {#event-preprocessor} | ||||
|  | ||||
| - **说明** | ||||
|  | ||||
|   事件预处理。 | ||||
|  | ||||
|   装饰一个函数,使它在每次接收到事件并分发给各响应器之前执行。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `func` ([T_EventPreProcessor](typing.md#T-EventPreProcessor)) | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - [T_EventPreProcessor](typing.md#T-EventPreProcessor) | ||||
|  | ||||
| ## _def_ `event_postprocessor(func)` {#event-postprocessor} | ||||
|  | ||||
| - **说明** | ||||
|  | ||||
|   事件后处理。 | ||||
|  | ||||
|   装饰一个函数,使它在每次接收到事件并分发给各响应器之后执行。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `func` ([T_EventPostProcessor](typing.md#T-EventPostProcessor)) | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - [T_EventPostProcessor](typing.md#T-EventPostProcessor) | ||||
|  | ||||
| ## _def_ `run_preprocessor(func)` {#run-preprocessor} | ||||
|  | ||||
| - **说明** | ||||
|  | ||||
|   运行预处理。 | ||||
|  | ||||
|   装饰一个函数,使它在每次事件响应器运行前执行。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `func` ([T_RunPreProcessor](typing.md#T-RunPreProcessor)) | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - [T_RunPreProcessor](typing.md#T-RunPreProcessor) | ||||
|  | ||||
| ## _def_ `run_postprocessor(func)` {#run-postprocessor} | ||||
|  | ||||
| - **说明** | ||||
|  | ||||
|   运行后处理。 | ||||
|  | ||||
|   装饰一个函数,使它在每次事件响应器运行后执行。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `func` ([T_RunPostProcessor](typing.md#T-RunPostProcessor)) | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - [T_RunPostProcessor](typing.md#T-RunPostProcessor) | ||||
|  | ||||
| ## _async def_ `check_and_run_matcher(Matcher, bot, event, state, stack=None, dependency_cache=None)` {#check-and-run-matcher} | ||||
|  | ||||
| - **说明:** 检查并运行事件响应器。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `Matcher` (type[[Matcher](matcher.md#Matcher)]): 事件响应器 | ||||
|  | ||||
|   - `bot` ([Bot](adapters/index.md#Bot)): Bot 对象 | ||||
|  | ||||
|   - `event` ([Event](adapters/index.md#Event)): Event 对象 | ||||
|  | ||||
|   - `state` ([T_State](typing.md#T-State)): 会话状态 | ||||
|  | ||||
|   - `stack` (AsyncExitStack | None): 异步上下文栈 | ||||
|  | ||||
|   - `dependency_cache` ([T_DependencyCache](typing.md#T-DependencyCache) | None): 依赖缓存 | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - None | ||||
|  | ||||
| ## _async def_ `handle_event(bot, event)` {#handle-event} | ||||
|  | ||||
| - **说明:** 处理一个事件。调用该函数以实现分发事件。 | ||||
|  | ||||
| - **参数** | ||||
|  | ||||
|   - `bot` ([Bot](adapters/index.md#Bot)): Bot 对象 | ||||
|  | ||||
|   - `event` ([Event](adapters/index.md#Event)): Event 对象 | ||||
|  | ||||
| - **返回** | ||||
|  | ||||
|   - None | ||||
|  | ||||
| - **用法** | ||||
|  | ||||
|   ```python | ||||
|   import asyncio | ||||
|   asyncio.create_task(handle_event(bot, event)) | ||||
|   ``` | ||||
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