c - FindFirstFile 和 Junctions

Question

我用它来获取目录 foo 的内容:FindFirstFile(L"foo\\*", &findData)。当 foo 是一个常规目录时，它工作得很好。但是，当 foo 是指向另一个目录(使用 mklink/j foo C:\gah 创建)的连接时，FindFirstFile 失败。

文档是这样说的:“如果路径指向符号链接(symbolic link)，则 WIN32_FIND_DATA 缓冲区包含有关符号链接(symbolic link)的信息，而不是目标。”但是当我运行调试器时，我只得到一个 INVALID_HANDLE_VALUE 并且 findData 保持不变。

那么，我该如何解决这个问题？

Answer 1

Raymond Chen 有一个 answer给你。

Functions like GetFileAttributes and FindFirstFile, when asked to provide information about a symbolic link, returns information about the link itself and not the link destination. If you use the FindFirstFile function, you can tell that you have a symbolic link because the file attributes will have the FILE_ATTRIBUTES_REPARSE_POINT flag set, and the dwReserved0 member will contain the special value IO_REPARSE_TAG_SYMLINK.

Okay, great, so now I know I have a symbolic link, but what if I want information about the link target? For example, I want to know the size of the link target, its last-modified time, and its name.

To do this, you open the symbolic link. The I/O manager dereferences the symbolic link and gives you a handle to the link destination. You can then call functions like GetFileSize, GetFileInformationByHandleEx, or GetFinalPathNameByHandle to obtain information about the symbolic link target.