例子将示范如何给你的函数指针传递附加参数。

This will show how to pass additional parameters to your handler function.

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它将工作包id(组件ID)和一个指针传递给工作流变量。

It passes the work package ID (component ID), plus a pointer, to workflow variables.

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然后，当通过free将该指针传递回来时，我们只需要倒退几个内存字节就可以再次找到这个结构。

Then, when they pass the pointer back via free , we simply back up a few memory bytes to find this structure again.

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