File Permissions

[DustyStew]

I am just starting with B4A. When using the File methods, what is the user ID? Is it possible to change the user, for instance, to system?
My experiments keep running into permission problems.

 

[JonPM]

Not sure what you mean exactly. You are using these file methods? Not too sure what you mean about user ID? I'm pretty sure any time you need to write/read files on the device your app will need some kind of permission.

 

[DustyStew]

system permissions

Any application will run as a particular user, presumably the user who ran the program. The application then has the permissions of that that user.

Files have owners. Some files are owned by root, some by system, some by other individual users, and so on.

From the Linux shell, I cannot access a particular file if I am just a regular user. But if I change to being the user "system" (by entering "su system" on a rooted device) I can now access that file.

If I want to access a file owned by "system", can I do that from B4A?

 

[Erel]

You cannot access system files on an unrooted device.

If your device is rooted you can do something like:
Running shell commands as SuperUser