Creates an enumerator of all the connection points supported in the connectable object, one connection point per IID.
创建在可连接对象中支持的所有连接点的枚举数，每个IID一个连接点。
A connectable object (that is, a source) can expose a connection point for its own interfaces or for any outgoing interface.
可连接物件(即来源)可以公开本身的介面或任何输出介面的连接点。
A connectable object (that is, a source) can expose a connection point for its own interfaces or for any outgoing interface.
可连接物件(即来源)可以公开本身的介面或任何输出介面的连接点。
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