Remember, views are just MapReduce functions in action; thus, you must define them.

记住，视图就是实际的MapReduce函数；因此，您必须定义它们。

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Now that you've read about using readdir and stat to find out about the entries of the directory, let's look at some code that demonstrates these functions in action.

既然已经学习了如何使用readdir和stat来查找目录中的条目，那么让我们来看看演示这些函数的一些实际代码。

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You can see the functions in action in the example program demo.jdic.FileExtensionDemo. The top part of the application lets you to browse for a file and then open it, as you can see in Figure 4.

可以在示例程序demo . jdic . FileExtensionDemo中看到这些函数的实际作用。

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