SdFat: How to go to parent directory?

Other Hardware Storage
1

I wonder how to go to the parent directory with SdFat.

SdFat sd;
sd.vwd()->chdir("..") does nothing
sd.vwd()->chdir() goes to the root directory

Any hints?

Thanks, Oliver

2

There is not a supported way.

I wrote a function:

  /** experimental don't use */
  bool openParent(SdBaseFile* dir);

I made it private since I was not to happy with the design. No one asked for it so I didn't follow up.

You could edit SdBaseFile.h at about line 358 and make it public. I may not work since I wrote it a long time ago.

3

Hi

Thanks a lot for the quick reply. I made openParent a public member, but the following code does not work:

      if ( !sd.vwd()->isRoot() )
        sd.vwd()->openParent(sd.vwd());

Maybe I used this procedure in a wrong way. What would be a proper way to call "openParent"?

I am working on a file selection box (LCD), where the user should be able to navigate through the folder hierachy. For this purpose my idea was to modify "vwd".

Thanks, Oliver