fs.readdir and fs.unlink problems

[espruino-discuss]

Posted at 2014-11-26 by Hellis

How do I browse subfolders and unlink files in subfolders?

The picture shows how I can read the root and first subfolder, but not the second subfolder.
And I can delete a file in the root but I can't delete them in subfolders.

What am I doing wrong?

Attachments:

• Capture.JPG

[gfwilliams]

Posted at 2014-11-26 by @gfwilliams

Hi - I think it may just be that you're using the wrong type of slash (and I'm not sure you need the first one either)... Try fs.readdir("DCIM/101GOPRO") and see if that works?

[espruino-discuss]

Posted at 2014-11-26 by Hellis

Wow!
That was a fast reply.

But you are correct! it was the slash

Thanks!

[espruino-discuss]

Posted at 2014-11-30 by Hellis

Ok now I have managed to hit the next problem.

Don't know if its the code that is incorrect or if it's something else.
But the code works fine connected to the computer.
But when I save the code on the Espruino and use 'other' power supply it skips most of my code and just turns on LED2.

I have commented out the print-line as I only used it as "debug" when writing the code.
It's code to delete all the unnecessary files in GoPro´s and by doing that freeing up space for a few more minutes of recording.

var path = 'DCIM/101GOPRO';
var files = fs.readdirSync(path);


for(var i in files) {
  var str=files[i];
  str2=str.split('.');
   if(str2[1] === "THM" || str2[1] === "LRV") {
       LED1.write(1);
       //print(files[i]);
       fs.unlink(path + '/' + files[i]);
   }
  LED1.write(0);
}
LED2.write(1);

Any suggestions why it doesn't run when I use my phone as power supply?

[gfwilliams]

Posted at 2014-12-01 by @gfwilliams

It'll be because your code is running as soon as you send it to Espruino. Try wrapping it up into a function - there's a special one called onInit that gets called when Espruino starts:

function onInit() {
  var path = 'DCIM/101GOPRO';
  var files = fs.readdirSync(path);
  for(var i in files) {
    var str=files[i];
    str2=str.split('.');
     if(str2[1] === "THM" || str2[1] === "LRV") {
         LED1.write(1);
         //print(files[i]);
         fs.unlink(path + '/' + files[i]);
     }
   LED1.write(0);
  }
  LED2.write(1);
}

Or it might be more sensible to do it only when you press a button:

function deleteFiles() {
  var path = 'DCIM/101GOPRO';
  var files = fs.readdirSync(path);
  for(var i in files) {
    var str=files[i];
    str2=str.split('.');
     if(str2[1] === "THM" || str2[1] === "LRV") {
         LED1.write(1);
         //print(files[i]);
         fs.unlink(path + '/' + files[i]);
     }
   LED1.write(0);
  }
  E.unmountSD();
  LED2.write(1);
}

setWatch(deleteFiles, BTN, { repeat:true, edge:"rising", debounce:100 });

I've also added E.unmountSD() in the second example. It makes sure it 'disconnects' from the SD card, so you can use it multiple times on different cards.

[espruino-discuss]

Posted at 2014-12-01 by Hellis

This code works great for <32 GB cards.
But exFAT file systems are not supported.

Is there a workaround for that?

echo(0);
ERROR: Unable to mount SD card : NO_FILESYSTEM
=undefined

[gfwilliams]

Posted at 2014-12-01 by @gfwilliams

Well, it looks like you can reformat the larger SD cards as FAT32, and then they'll work - at least according to this

It's just that as the come out of the box they have exfat on them, which it looks like the FatFS library I use doesn't support.

[espruino-discuss]

Posted at 2014-12-01 by Hellis

I noticed that too after googling a while.
And started the format through DOS as Windows won't allow FAT32.

10% @ about 30 minuts....
I will reply when it's done and I have tested if it worked!

[espruino-discuss]

Posted at 2014-12-01 by Hellis

The volume is too big for FAT32.

Thats odd. It's only a 64 GB SD card

[gfwilliams]

Posted at 2014-12-01 by @gfwilliams

:( It only told you after it had got some way of the way through?

[espruino-discuss]

Posted at 2014-12-01 by Hellis

It had to go all the way to 100% before telling me :-)

I had such high hopes on DOS and it let me down.... I have not had any hopes on Win since 3.11 and now DOS lets me down too.

I guess I have to find another way.

[espruino-discuss]

Posted at 2014-12-01 by Hellis

Verbatim FAT32 tool works great!
http://www.verbatim.com/index/search.php?words=fat32+tool&lang_id=1&basic_search_form_submit.x=0&basic_search_form_submit.y=0

And I once it was formated as FAT32 the code works perfect!
Now I just need to build a case for the Espruino.
Thank you for the help Gordon! :-)