如果文件不存在，有没有办法创建和打开文件，否则会失败? [英] Is there any way to create and open a file if it doesn't exist but fail otherwise?

问题描述

它看起来像 OpenOptions 不支持这种情况，现有文件将被截断或覆盖.

It looks like OpenOptions does not support this scenario and an existing file will either be truncated or overwritten.

推荐答案

从 Rust 1.9.0 开始，有 OpenOptions::create_new 它使您能够安全且原子地确保您正在创建新文件，并且您的命令将失败除此以外.

As of Rust 1.9.0, there is OpenOptions::create_new which enables you to safely and atomically ensure that you are creating a new file, and that your command will fail otherwise.

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