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摘要： // Asked to connect to a pin. // A pin is always attached to an owning filter object // so we always delegate our locking to that object.//一个pin总是连接到一个拥有filter的对象，因此Connect函数总是把我们的//锁委托给这个对象。// We first of all retrieve a media type enumerator for the input pin // and see if we accept any of the form 阅读全文