Question

I use this go get the content of directory foo: FindFirstFile(L"foo\\*", &findData). It works great when foo is a regular directory. However when foo is a junction pointing to another directory (created with mklink /j foo C:\gah) FindFirstFile fails.

The docs have this to say: “If the path points to a symbolic link, the WIN32_FIND_DATA buffer contains information about the symbolic link, not the target.” But when I run it the debugger I just get an INVALID_HANDLE_VALUE and findData remains untouched.

So, how do I work around this?

Answer 1

Raymond Chen has an answer for you.

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.