我可以在c ++中的Windows中读取文件而不锁定包含该文件的文件夹吗？

Question

I have a c++ program that continuously reads a log file(ex: C:/temp/file.txt). However, while the program is running I want to be able to delete/rename the folder('temp') containing the file being monitored.

Currently, I'm using CreateFile().

        CreateFile(
                  szFilename,
                  GENERIC_READ,
                  FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
                  NULL,
                  OPEN_EXISTING,
                  FILE_ATTRIBUTE_NORMAL,
                  NULL)

I get the following error whenever I delete/rename the folder: "The action can't be completed because the folder or file in it is open in another program"

Is there a way to read/open a file without locking it?

Answer 1

You can create a hardlink to this file somewhere else using CreateHardLinkW and open it instead of original file. This way the original file (which is actually a hardlink as well) and the folder containing it can be renamed / deleted but the file itself will be still accessible. Note that this method implies some restrictions on type of underlying file system, hardlink location, and access rights.