当服务器不再希望在端点中注册时，调用这个例程。

When the server no longer wants to be registered with the endpoint, this routine is called.

youdao

有许多可以为其注册回调例程的操作，这个参数值指出了每个以EM _开头的操作(完整列表可以从api参考指导中获得)。

There are a number of operations that you can register callback routines for and the value to indicate each operation begins with EM_ (the complete list is available in the API reference guide).

youdao

在注册回调例程之前，使用EMCreateRecursionID函数获得一个递归id很有用。

Before registering the callback routine, it is useful to obtain a recursion ID using the EMCreateRecursionID function.

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