> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# PFMultiplayerFreeMemoryCallback

> 每当先前分配的内存缓冲区不再被 PlayFab Multiplayer 库需要且可以释放时调用的回调。

每当先前分配的内存缓冲区不再被 PlayFab Multiplayer 库需要且可以释放时调用的回调。

## 语法

```cpp theme={null}
typedef
void (*PFMultiplayerFreeMemoryCallback)(  
    void* pointer,  
    uint32_t memoryTypeId  
)  
```

### 参数

**`pointer`**   void\*\
**Post\_invalid**

指向先前分配的内存缓冲区的指针。此值永远不会为 nullptr。

**`memoryTypeId`**   uint32\_t

一个不透明标识符，表示所释放内存的 PlayFab Multiplayer 库内部类别。应忽略此值。

### 返回值

类型：void

该回调不返回值。

## 备注

此回调可通过 [PFMultiplayerSetMemoryCallbacks()](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks.md) 方法选择性地安装。\
\
 当 PlayFab Multiplayer 库使用完由标题对应的 [PFMultiplayerAllocateMemoryCallback](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback.md) 先前返回的内存缓冲区时，将调用此回调，以便标题可以释放该内存缓冲区。

## 要求

**头文件：** PFMultiplayer.h

## 另请参阅

[PFMultiplayer 成员](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/pfmultiplayer_members.md)\
[PFMultiplayerAllocateMemoryCallback](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback.md)\
[PFMultiplayerSetMemoryCallbacks](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks.md)


## Related topics

- [PFMultiplayerAllocateMemoryCallback](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/callbacks/pfmultiplayerallocatememorycallback.md)
- [PFMultiplayerSetMemoryCallbacks](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/lobby/playfabmultiplayerreference-cpp/pfmultiplayer/functions/pfmultiplayersetmemorycallbacks.md)
- [game_chat_free_memory_callback](https://docs.xbox.com/zh-CN/reference/chat/gamechat2/functions/game_chat_free_memory_callback.md)
- [PartyFreeMemoryCallback](https://docs.xbox.com/zh-CN/services/playfab/multiplayer/networking/reference/callbacks/partyfreememorycallback.md)
- [get_memory_callbacks](https://docs.xbox.com/zh-CN/reference/chat/gamechat2/classes/chat_manager/methods/chat_manager_get_memory_callbacks.md)