Android Question FTP Server Invalid Path

[Blueforcer]

Im using the B4X FTP Server in my B4A App.
BaseDir is Files.DirInternal.

Connection and directory/file listing is working, but i cannot do more.
Download, Upload, Deleting and Directory change is not possible.
I always get an Invalid path error
e.g from a filedelete in filezilla (in passive mode)

Status: Connecting to 192.168.178.25:51041...
Status: Connection established, waiting for welcome message...
Status: Insecure server, it does not support FTP over TLS.
Status: Logged in
Status: Deleting "/button-eco-betrieb-ein.png"
Command: CWD /
Response: 450 Invalid path:
Command: DELE /button-eco-betrieb-ein.png
Response: 500 Invalid path

In the Sub HandleClientCommand i get DELE as command and /button-eco-betrieb-ein.png as parameter.
The Function CombineWithCurrent(parameters) returns an empty string with results in this error message.
I followed this function to NormalizePath
Here the CanonicalPath is /data/data/de.dinotec/files/button-eco-betrieb-ein.png and it is compared to the startingstring of BaseDir wich is /data/user/0/de.dinotec/files
So this Comparison fails because of a complete different folder i think

Where does it come from?

 

[Blueforcer]

Also tried it with different folders like GetSafeDirDefaultExternal: Same Error

 

[Erel]

Try the updated example: https://www.b4x.com/android/forum/t...mplemented-with-socket-and-asyncstreams.74320
The base folder is set to XUI.DefaultFolder (=File.DirInternal).

 

[Blueforcer]

Try the updated example: https://www.b4x.com/android/forum/t...mplemented-with-socket-and-asyncstreams.74320
The base folder is set to XUI.DefaultFolder (=File.DirInternal).

Unfortunately same Error with your untouched poject example

 

[Blueforcer]

Ok, it looks like the error depends on the device.
On the Huawei P30 Pro it doesnt work.
But it works on the Samsung Galaxy Tab S7+

can you imagine what differences there might be?

 

[Erel]

Check the device logs. Maybe more information there.

 

[Blueforcer]

Log is inconspicuous
Huawei:

client: AUTH TLS
client: AUTH SSL
client: USER service
client: PASS kmze
User logged in: service
client: OPTS UTF8 ON
client: PWD
client: TYPE I
client: PASV
client: LIST
client: DELE bodenduese.jpg

Samsung outputs the same

Also no error in unfiltered logs

 

[Erel]

There is no call to CWD in these logs.

I don't think that it is related to the device type. The problem is somewhere else.

 

[Blueforcer]

On the Samsung Tab there is also no CWD command and its working.
Right now the device is the only difference.
same ftp client, same app, same settings but different device.

 

[Blueforcer]

Today weve got our development HMI Panels with Android 7.1.2.
Here we have the same problem.
what can i do to isolate the problem?

 

[amorosik]

Try the updated example: https://www.b4x.com/android/forum/t...mplemented-with-socket-and-asyncstreams.74320
The base folder is set to XUI.DefaultFolder (=File.DirInternal).

XUI.DefaultFolder, File.DirInternal, DirExternal, primary, secondary storage, sd card....
I don't understand anything anymore
Where to find an updated document/post of which memory areas are available on Android, and how are they referenced by the B4A functions?

 

[josejad]

Where to find an updated document/post of which memory areas are available on Android,

you should start a new thread to not mesh the OP post, but here you have some advices

Flow chart to help choose folder

This flow chart will help you choose the folder in all kinds of different cases: There were reasons to use other folders in the past. Those reasons are no longer relevant, mainly due to new restrictions in Android. Other options to access local and remote files...

www.b4x.com

SaveAs - Let the user select a target folder + list of other related methods

B4A + B4i example: https://www.b4x.com/android/forum/threads/b4x-texteditor-save-and-load-external-files.132731/#post-838166 List of classes or libraries that can be used to access secondary storages: ContentChooser (Phone libray) - allows the user to select a resource or file using external...

www.b4x.com

How to access Android/data on Android 11?

Now I am trying to access Android/data folder on Android 11 for reading and writing. But I can't even list the Android folder. Some app can access this with somehow I don't know. Like X-Plore.(I don't need to install it from Google Play Store but it's working without any problem) I found an...

www.b4x.com

tips 8 - 10

[B4X] Features that Erel recommends to avoid

Many things have changed in B4X and also in the underlying platforms. I will try to list here all kinds of (old) features that have better alternatives. B4X is backward compatible so these features still work. The recommendations are more relevant for new projects or when implementing new...

www.b4x.com

 

[Erel]

The behavior is not related to the device type. Once you understand it you will be able to continue debug it.
Other than that, there isn't enough information here to say anything.

 

[Blueforcer]

I still have the problem and unable to fix it.
I tried 4 different devices

I also tried differend computers, FTP-Clients and disabled my firewall

I test all with the unmodified example app:

Status:    Connecting to 192.168.178.24:51041...
Status:    Connection established, waiting for welcome message...
Status:    Insecure server, it does not support FTP over TLS.
Status:    Logged in
Status:    Retrieving directory listing...
Status:    Directory listing of "/" successful
Status:    Connecting to 192.168.178.24:51041...
Status:    Connection established, waiting for welcome message...
Status:    Insecure server, it does not support FTP over TLS.
Status:    Logged in
Status:    Starting upload of C:\Users\Stephan\Desktop\trend.png
Command:    CWD /
Response:    450 Invalid path:
Command:    MKD /
Response:    500 Invalid path
Command:    CWD /
Response:    450 Invalid path:
Command:    SIZE /trend.png
Response:    500 Invalid path
Command:    MDTM /trend.png
Response:    450 Invalid path:
Command:    TYPE I
Response:    500 Invalid path
Error:    File transfer failed

The only thing (Besides my investigation in the frist port) i noticed:
If i connect tha app says "Number of Clients: 1"
When i want to start a upload it increases to 2
and upload fails after that

 

[Mihai Rainer Jr.]

I know a little late, but for future searches:
Tested with hard codded BaseDir (something like /data/data/<package_name>/files) and is working fine.
My tests were performed on a rooted Android device, don't have any non-rooted to check.
But it worked for my purposes.
Using DirInternal returns exactly the errors you have mentioned above.