Listing 4 shows an excerpt from the event channel.

清单4显示了事件通道的一个摘录。

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The interface for a simple event channel is shown in Listing 2.

简单事件通道的接口如清单2所示。

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Now, we open the datagram channel and set up the options for multicasting, as shown in Listing 4.

现在，打开数据报通道并设置多播选项，如清单4所示。

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