使用数据缓冲区Using Data Buffers

数据缓冲区由三部分信息描述:其类型、地址和字节长度。Data buffers are described by three pieces of information: their type, address, and byte length. 每当函数需要这些信息的其中一项并且尚不知道该函数时,它就会提供应用程序将其传递到的参数。Whenever a function needs one of these pieces of information and does not already know it, it has an argument with which the application passes it.

本部分包含以下主题。This section contains the following topics.