strlcat函数把以NUL结尾的字符串src附加到dst的结尾(但是目标中的字符数目将不超过size - 1)。
The strlcat function appends the NUL-terminated string SRC to the end of DST (but no more than size-1 characters will be in the destination).
本例只存储字符串数据，所以您可以简单地将之附加到一个较长的字符串后面，并调用Calculator Handler中的一个简单函数，然后该函数可以将之解析出来。
This example is only storing string data, so arguably you can simply append it to a longer string and call a simple function in the CalculatorHandler, which in turn can parse it out.
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