Android Question B4A Pages SMB Filetransfer

[DirkH]

Hello,
I try to transfers files to a server using SMB. I was told that B4X pages is the way to go, targetSdkVersion="34", no DisableStrictMode. I'm trying for several weeks now, but it seems to be impossible. The last code, which caused an Error similar to many other solutions I tried, was for a small program to try to focus better on the problem. It uses additional libraries: jcifs-ng-2.1.9 slf4j-api-1.7.25 bcprov-jdk15on-1.68 bcpkix-jdk15on-1.68 commons-logging-1.2


The code in starter was::

#Region  Service Attributes
    #StartAtBoot: False
    #ExcludeFromLibrary: True
#End Region

Sub Process_Globals
    Public smbContext As JavaObject
    Public smbBenutzer As String = "________"
    Public smbPasswort As String = "*******"
End Sub

Sub Service_Create
    Log("🔧 Starter.Service_Create")
    ' Kein automatischer Aufruf hier!
End Sub

Sub Service_Start (StartingIntent As Intent)
    Log("ℹ️ Starter.Service_Start")
    Service.StopAutomaticForeground
End Sub

' Wird z. B. über Button in MainPage aufgerufen
Public Sub StarteSMBKontextThread
    Log("▶️ Starte SMB-Kontext-Thread")

    Dim joMe As JavaObject = Me
    Dim runnable As Object = joMe.CreateEvent("java.lang.Runnable", "SMBKontextRunnable", Null)
    Dim t As JavaObject
    t.InitializeNewInstance("java.lang.Thread", Array(runnable))
    t.RunMethod("start", Null)
End Sub

Sub SMBKontextRunnable_Event  ' ❗ KEIN Parameter erlaubt
    Try
        Log("🔧 SMBKontextRunnable: Aufbau startet...")

        Dim baseContext As JavaObject
        baseContext.InitializeStatic("jcifs.context.BaseContext")

        Dim config As JavaObject
        config.InitializeNewInstance("jcifs.config.PropertyConfiguration", Array(Null))

        Dim credentials As JavaObject
        credentials.InitializeNewInstance("jcifs.smb.NtlmPasswordAuthenticator", Array(smbBenutzer, smbPasswort))
        Dim instance As JavaObject = baseContext.RunMethod("getInstance", Null)
        Dim context As JavaObject = instance.RunMethod("withCredentials", Array(credentials))
        smbContext = context

        Log("✅ SMB-Kontext aufgebaut.")
        CallSubDelayed2(Me, "ErzeugeSMBKontextFertig", True)

    Catch
        Log("❌ Fehler beim SMB-Kontextaufbau: " & LastException)
        CallSubDelayed2(Me, "ErzeugeSMBKontextFertig", False)
    End Try
End Sub

Public Sub ErzeugeSMBKontextFertig(success As Boolean)
    If success Then
        Log("📦 SMB-Kontext wurde erfolgreich aufgebaut.")
    Else
        Log("⚠️ SMB-Kontext-Aufbau fehlgeschlagen.")
    End If
End Sub

The error-message/log-file was :

Button geklickt – starte SMB-Kontext.
Fordere Starter auf, den SMB-Kontext aufzubauen...
Starte SMB-Kontext-Thread
java.lang.Exception: Sub smbkontextrunnable_event signature does not match expected signature.
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:223)
at anywheresoftware.b4a.BA$2.run(BA.java:395)
at android.os.Handler.handleCallback(Handler.java:959)
.....
java.lang.RuntimeException: java.lang.Exception: Sub smbkontextrunnable_event signature does not match expected signature.
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:258)
at anywheresoftware.b4a.BA$2.run(BA.java:395)
...
Caused by: java.lang.Exception: Sub smbkontextrunnable_event signature does not match expected signature.
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:223)
... 9 more

I tried also inline Java, until now without success. My question: Is there a "legal" way to transfer files via SMBat presnt? Are there examples available? I found several examples, but they do not work without using some trick like DisableStrictMode.

Kind regards Dirk

 

[Erel]

Don't use the starter service at all. Move this code to one of the B4XPages.
The problem is here: Sub SMBKontextRunnable_Event
Let the IDE autocomplete the event signature for you:

 

[DirkH]

The line is now:

Private Sub SMBKontextRunnable_Event (SMBKontextRunnable As String, Args() As Object) As Object

which solved my problem, thank you very much!

Kind regards Dirk