C ++文件处理：ios :: app和ios :: ate之间的区别？ [英] C++ Filehandling: Difference between ios::app and ios::ate?

问题描述

ios :: ate 和 ios：app 在写入文件时有什么区别。

在我看来， ios :: app 使您能够在文件中四处移动，而 ios :: ate 它只能在文件末尾读/写。

What's the difference between ios::ate and ios:app when writing to a file.
In my view, ios::app gives you the ability to move around in the file, whereas with ios::ate it can only read/write at the end of the file. Is this correct?

推荐答案

这是另一种方法。设置 ios :: ate 时，初始位置将是文件的末尾，但此后您可以自由查找。设置 ios :: app 时，所有输出操作将在文件末尾执行。由于所有写操作都隐含在查找之前，因此无法在其他地方写操作。

It’s the other way around. When ios::ate is set, the initial position will be the end of the file, but you are free to seek thereafter. When ios::app is set, all output operations are performed at the end of the file. Since all writes are implicitly preceded by seeks, there is no way to write elsewhere.

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