August 2021
Intermediate to advanced
450 pages
9h 36m
Chinese
Content preview from C++程序设计：原理与实践（基础篇）（原书第2版）
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11.3 打开和定位文件
从C++程序的角度看，文件是操作系统提供的一个抽象。如10.3节所述，一个文件就是一个从0开始编号的简单的字节序列：
问题是我们如何访问这些字节。如果使用iostream，访问方式很大程度上在我们打开文件将其与一个流相关联时就确定了。流的属性决定了文件打开后我们可以对它执行哪些操作，以及这些操作的意义。最简单的一个例子是，如果打开文件关联至一个istream，我们可以从文件读取数据，而使用ostream打开文件的话，我们可以向文件写入数据。
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