使用FILE_ATTRIBUTE_TEMPORARY和FILE_FLAG_DELETE_ON_CLOSE [英] Using FILE_ATTRIBUTE_TEMPORARY and FILE_FLAG_DELETE_ON_CLOSE

问题描述

在我的C ++应用程序中创建临时文件时，我使用两个标志 FILE_ATTRIBUTE_TEMPORARY 和 FILE_FLAG_DELETE_ON_CLOSE 根据此博客，不应该在磁盘上创建的任何文件。但在我的代码文件是创建和写入到磁盘（即使1 KB数据）。有人可以确认这些标志的确切功能，以及文件是否在磁盘上创建？

I am using the two flags FILE_ATTRIBUTE_TEMPORARY and FILE_FLAG_DELETE_ON_CLOSE while creating temporary files in my C++ application. According to this blog there shouldn't be any file being created on the disk. But in my code the file is created and written to on disk (even for 1 KB data). Can someone confirm the exact functionality of these flags, and whether the files are created on disk or not?

推荐答案

相同的链接，有引号：

如果超过可用内存，
内存管理器将刷新文件
数据到磁盘。这会导致
的性能损失，但您的操作
将成功而不是失败。

If you exceed available memory, the memory manager will flush the file data to disk. This causes a performance hit, but your operation will succeed instead of failing.

将文件标记为临时将告诉系统它不需要在磁盘上，但它不会阻止它被放在那里。

Marking a file as temporary will tell the system it doesn't need to be on disk, but it doesn't prevent it from being put there, either.

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