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

# XUserChangeEvent

> XUserChangeEvent

# XUserChangeEvent

指定用户更改事件的类型。

## Syntax

```cpp theme={null}
enum class XUserChangeEvent  : uint32_t  
{  
    SignedInAgain = 0,  
    SigningOut = 1,  
    SignedOut = 2,  
    Gamertag = 3,  
    GamerPicture = 4,  
    Privileges = 5,  
}  
```

## Constants

| 常量            | 说明                                                       |
| ------------- | -------------------------------------------------------- |
| SignedInAgain | 用户再次登录。仅在游戏在用户注销后保留 **XUserHandle** 并且同一用户再次登录时才会发生这种情况。 |
| SigningOut    | 用户正在注销。                                                  |
| SignedOut     | 用户已注销。                                                   |
| Gamertag      | 用户的玩家代号已更改。                                              |
| GamerPicture  | 用户的玩家头像已更改。                                              |
| Privileges    | 用户的特权已更改。                                                |

## Remarks

若要监视用户状态或用户信息中的更改，请订阅 XUserChangeEvent。
调用 [XUserRegisterForChangeEvent](/reference/system/xuser/functions/xuserregisterforchangeevent) 函数订阅 XUserChangeEvent。
[XUserRegisterForChangeEvent](/reference/system/xuser/functions/xuserregisterforchangeevent) 函数接受指向 [XUserChangeEventCallback](/reference/system/xuser/functions/xuserchangeeventcallback) 回调参数的指针。函数返回指向回调的指针。
[XUserChangeEventCallback](/reference/system/xuser/functions/xuserchangeeventcallback) 回调接受 XUserChangeEvent 枚举作为参数。

以下示例演示了如何处理用户更改事件。

```cpp theme={null}
HRESULT RegisterForChanges()
{
    RETURN_HR_IF(E_UNEXPECTED, _token.token != 0);
    RETURN_IF_FAILED(XUserRegisterForChangeEvent(
        _queue,
        this,
        UserChangeEventHandler,
        &_token));
    return S_OK;
}

void UnregisterForChanges()
{
    XUserUnregisterForChangeEvent(_token, false);
    _token.token = 0;
}

void UserChangeEventHandler(
    XUserLocalId userLocalId,
    XUserChangeEvent event)
{
    auto iter = std::find_if(
        _users.begin(),
        _users.end(),
        [&userLocalId](const User& candidate)
    {
        XUserLocalId candidateUserLocalId;
        XUserGetLocalId(candidate.Handle(), &candidateUserLocalId);
        return candidateUserLocalId == userLocalId;
    });

    // User not known
    if (iter == _users.end())
    {
        return;
    }

    auto handle = iter->Handle();

    // If a guest gets signed out, immediately close the handle
    bool isGuest;
    if (SUCCEEDED_LOG(XUserGetIsGuest(handle, &isGuest)) &&
        isGuest &&
        event == XUserChangeEvent::SignedOut)
    {
        _users.erase(iter);
    }

    if (event == XUserChangeEvent::SigningOut)
    {
        // Delay the user signing out just for fun
        XUserSignOutDeferralHandle deferral;
        if (SUCCEEDED_LOG(XUserGetSignOutDeferral(&deferral)))
        {
            // Hold the deferral for 5 seconds then close it
            std::thread completeDeferralThread(
                [deferral]()
            {
                std::this_thread::sleep_for(std::chrono::milliseconds(5000));
                XUserCloseSignOutDeferralHandle(deferral);
            });

            completeDeferralThread.detach();
        }
    }

    if (event == XUserChangeEvent::GamerPicture)
    {
        iter->LoadGamerPicAsync(_queue);
    }
}
```

## Requirements

**头文件：** XUser.h

**受支持的平台：** Windows、XBOX One 系列主机和 XBOX Series 主机

## See also

[XUser](/reference/system/xuser/xuser_members)

[XUserRegisterForChangeEvent](/reference/system/xuser/functions/xuserregisterforchangeevent)

[XUserChangeEventCallback](/reference/system/xuser/functions/xuserchangeeventcallback)