When wrapping up the program, the EMDeregister() function is used to de-register the callback routine.

在结束该程序时，要使用 EMDeregister() 函数取消对回调例程的注册。

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The EMRegister function is used to register the callback routine. It is best explained with an example.

EMRegister函数用于注册回调例程。

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

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

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