Can't Save - Permissions Error

School Boy Error · Feb 7, 2012

Hi,

If you run this attachment and click on English you'll see a list of made up names. When you click the objectives it should scroll though unsecure, developing, secure depending on how well the children have achieved the objective. Earlier (once) I did get it to save and the english.csv saved onto my device in My Files/Markbook/ however this only had the headers and no content!

Now, I don't know what I've done wrong but I've moved the save code around and around and around and now it pauses everytime on that line (the StringUtils save line) and comes up with a permission error. I tried to delete the file using File.Delete("/mnt/My Files/Markbook/","english.csv")
before saving but that didn't work either!

I've put it in the pause code now because when the user presses the backkey I would like to save their changes....or at least ask them but I've tried calling the ShallWeSave from the Pause and it doesn't happen!

I think I've confused myself now...

MiniDemonic · Feb 8, 2012

Can't help you with the permission error.
But if you want to prompt them to save when they press the back button you should intercept the button press.

more info http://www.b4x.com/forum/basic4andr.../9233-intercepting-back-button.html#post51197

Erel · Feb 8, 2012

You can only write to folders under File.DirInternal or DirInternalCache or on the storage card.

School Boy Error · Feb 8, 2012

Erel said:
You can only write to folders under File.DirInternal or DirInternalCache or on the storage card.

It wrote to the folder the first time, (when it didn't already exist). How then can I get it to write to a specific folder? Or where should I been saving my csv files on the device?

Thanks MiniDemonic, I'll take a look at that.

School Boy Error · Feb 8, 2012

Erel said:
You can only write to folders under File.DirInternal or DirInternalCache or on the storage card.

I doubt I can use

B4X:

File.DirInternal & "/My Files/Markbook/"

School Boy Error · Feb 8, 2012

However, I did use a Msgbox to find out that the File.DirRootExternal returns /mnt/sdcard/ which is where I got the path "/mnt/sdcard/My Files/Markbook/" from.

It did work once when this file didn't exist, but I don't know how to delete it so that I can save the new version.

School Boy Error · Feb 8, 2012

MiniDemonic said:
Can't help you with the permission error.
But if you want to prompt them to save when they press the back button you should intercept the button press.

more info http://www.b4x.com/forum/basic4andr.../9233-intercepting-back-button.html#post51197

I tried that using this code:

B4X:

Sub Activity_KeyPress (KeyCode As Int)

   Msgbox(KeyCode,"")

   If KeyCode = 4 Then 

      Select Msgbox2("Do you want to save your changes?", "Exit Markbook", "Yes","Cancel", "No",Null)
         Case DialogResponse.POSITIVE
            SaveTableToCSV("mnt/sdcard/My Files/Markbook/","english.csv")
            Activity.Finish
         Case DialogResponse.NEGATIVE
            Activity.Finish
         Case DialogResponse.CANCEL
            Return True
      End Select 
   
   End If

End Sub

Now it crashes everytime when I choose, either Yes, No or Cancel! My foot and my laptop are about to meet become friends!!

MiniDemonic · Feb 8, 2012

You forgot "As Boolean" at the end of the Keypress sub.

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean

    Msgbox(KeyCode,"")

    If KeyCode = 4 Then 

        Select Msgbox2("Do you want to save your changes?", "Exit Markbook", "Yes","Cancel", "No",Null)
            Case DialogResponse.POSITIVE
                SaveTableToCSV(File.DirRootExternal & "/My Files/Markbook/","english.csv")
                Activity.Finish
            Case DialogResponse.NEGATIVE
                Activity.Finish
            Case DialogResponse.CANCEL
                Return True
        End Select 
    
    End If

End Sub

School Boy Error · Feb 8, 2012

MiniDemonic said:
You forgot "As Boolean" at the end of the Keypress sub.

Thank you! That's sorted me out!

Now, if I can find out how to save a file I would be finished !

MiniDemonic · Feb 8, 2012

http://www.b4x.com/forum/basic4andr...ng-table-view-based-scrollview.html#post40046

This is all I can do to help you in this matter, but I guess that you were doing your coding based on that example anyway.

I can't think of a reason why you get a permission error, have you tried saving it to another folder?

School Boy Error · Feb 8, 2012

I have tried saving it to another folder, I've tried it with the file in there, I've tried an empty folder. It did work once but not again since!!!

The code keeps pausing at this line:

B4X:

   StringUtils1.SaveCSV2("/mnt/sdcard/My Files/Markbook/","english.csv", ",", list1, headers)

I've even tried changing the file name. I can't seem to find any examples of people saving to a specific directory and if they don't do that where do they save things? Surely they'd be all over the place.

MiniDemonic · Feb 9, 2012

http://www.b4x.com/forum/basic4andr...lmost-there-permission-problem.html#post39800

Try this.

Also found this.

Erel said:
Applications require a "Storage" permission before they can write to the storage card.
This permission is added when you use File.DirRootExternal or File.DirDefaultExternal.
For example instead of writing:

B4X:

File.Open("/sdcard/data", "db.db")

You should write:

B4X:

File.Open(File.DirRootExternal, "data/db.db")

The required permission will be added and also the correct folder will be chosen (it is possible that the storage card folder name will be different than sdcard).

School Boy Error · Feb 9, 2012

MiniDemonic said:
StringUtils1.SaveCSV2(File.DirRootExternal,"My Files/Markbook/english.csv", ",", list1, headers)

Thank you, thank you, thank you, thank you! That was exactly what I needed and couldn't find! It works an absolute treat!

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