The logger provides more detailed information and presents it in an XML format rather than as flat text; it also traces a subset of this data into an in-memory buffer for first failure data capture.
日志记录器提供更详细的信息并采用xml格式而不是一般文本；由于第一次数据捕捉失败，所以它还将此数据的子集记录进内存中的缓冲区。
Thus, you can reliably find out how much buffer space you would need to format something completely.
这样，您可以确切地得知您 将 需要多少缓冲区空间才可以完全格式化某些内容。
The format of the output buffer is defined by the 5th parameter (format name).
输出缓冲区的格式由第五参数(格式名称)定义。
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