Android Question Exception while copying file from SMB2 share using jcfis-ng

[Wosl]

Dear All,

I'm using the module jcfis-ng provided by DonManfred. Thank you to DonManfred!

I try to copy a SQL data base from a SMB2 share on my local network in order to use it in the app internally. Everything works fine in "Debug" mode, but in "Release" mode I'm receiving an exception:

In SQLDBCopySMB: Before SMB initialisierung
In SQLDBCopySMB: After SMBClient_Copy_Resource
In SQLDBCopySMB: After Resource allocation
main$ResumableSub_SQLDBCopySMBresume (java line: 26734)
android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1675)
    at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:115)
    at java.net.SocketOutputStream.write(SocketOutputStream.java:156)
    at jcifs.smb.SmbTransportImpl.doSend(SmbTransportImpl.java:894)
    at jcifs.util.transport.Transport.doSend(Transport.java:276)
    at jcifs.util.transport.Transport.sendrecv(Transport.java:215)
    at jcifs.smb.SmbTransportImpl.sendrecv(SmbTransportImpl.java:1005)
    at jcifs.smb.SmbTransportImpl.send(SmbTransportImpl.java:1523)
    at jcifs.smb.SmbSessionImpl.sessionSetupSMB2(SmbSessionImpl.java:549)
    at jcifs.smb.SmbSessionImpl.sessionSetup(SmbSessionImpl.java:483)
    at jcifs.smb.SmbSessionImpl.send(SmbSessionImpl.java:369)
    at jcifs.smb.SmbSessionImpl.send(SmbSessionImpl.java:347)
    at jcifs.smb.SmbTreeImpl.treeConnect(SmbTreeImpl.java:607)
    at jcifs.smb.SmbTreeImpl.send(SmbTreeImpl.java:429)
    at jcifs.smb.SmbTreeImpl.send(SmbTreeImpl.java:405)
    at jcifs.smb.SmbTransportImpl.getDfsReferrals(SmbTransportImpl.java:1703)
    at jcifs.smb.DfsImpl.getDcReferrals(DfsImpl.java:192)
    at jcifs.smb.DfsImpl.getDc(DfsImpl.java:234)
    at jcifs.smb.DfsImpl.getTrustedDomains(DfsImpl.java:112)
    at jcifs.smb.DfsImpl.resolve(DfsImpl.java:347)
    at jcifs.smb.DfsImpl.resolve(DfsImpl.java:321)
    at jcifs.smb.SmbTreeConnection.connectHost(SmbTreeConnection.java:525)
    at jcifs.smb.SmbTreeConnection.connectHost(SmbTreeConnection.java:484)
    at jcifs.smb.SmbTreeConnection.connect(SmbTreeConnection.java:460)
    at jcifs.smb.SmbTreeConnection.connectWrapException(SmbTreeConnection.java:421)
    at jcifs.smb.SmbFile.ensureTreeConnected(SmbFile.java:551)
    at jcifs.smb.SmbFile.length(SmbFile.java:1547)
    at de.donmanfred.SMBFilewrapper.getlength(SMBFilewrapper.java:281)
    at B4A.PVMonitoringNew.main$ResumableSub_SQLDBCopySMB.resume(main.java:26734)
    at anywheresoftware.b4a.BA.checkAndRunWaitForEvent(BA.java:275)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:215)
    at anywheresoftware.b4a.BA$2.run(BA.java:395)
    at android.os.Handler.handleCallback(Handler.java:958)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loopOnce(Looper.java:230)
    at android.os.Looper.loop(Looper.java:319)
    at android.app.ActivityThread.main(ActivityThread.java:8934)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:588)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)

The exception occurs in my resumable "sub SQLDBCopySMB". Here is a code snippet of it:

    'WOSL##################################################
    Log ("In SQLDBCopySMB: Before SMB initialisierung")
    'WOSL##################################################
    '---------------------------------------------------------------------------
    '  Init SMB2 share (triggers event SMBClient_Resource)
    '---------------------------------------------------------------------------
    smbClient.Initialize("SMBClient_Copy", credentials.Domain, credentials.Username, credentials.Password, credentials.Share)
    Wait for SMBClient_Copy_Resource (success As Boolean, smbobjres As Object, smbobj As Object, info As String)
    If smbobjres <> Null And smbobj <> Null And info = "OK" Then
        'WOSL##################################################
        Log ("In SQLDBCopySMB: After SMBClient_Copy_Resource")
        'WOSL##################################################
        '---------------------------------------------------------------------------
        '  Copy SQL data base from SMB share
        '---------------------------------------------------------------------------
        Dim smbResources As SMBResource = smbobjres
        Dim smbFiles As SMBFile = smbobj
        'WOSL##################################################
        Log ("In SQLDBCopySMB: After Resource allocation")
        'WOSL##################################################
        nSQLFileTotalSize = smbFiles.length
        'WOSL##################################################
        Log ("In SQLDBCopySMB: Before smbClient.Copy")
        'WOSL##################################################
        SQLFileTotalSize = nSQLFileTotalSize
        smbClient.Copy (smbResources, File.DirInternal & "/" & cSQLDatabasePath, cSQLDatabaseName)
        wait for SMBClient_Copy_CopyResult (success As Boolean, path As String, filename As String)
        If success = True Then
            MyLog ("SQL Datenbank '" & cSQLDatabaseName & "' vom SMB share erfolgreich nach '" & cSQLDatabasePath & "/" & cSQLDatabaseName & "' kopiert")
            iReturn = 0
        Else
            MyLog ("Fehler: SQL Datenbank '" & cSQLDatabaseName & "' konnte NICHT vom SMB share kopiert werden")
            iReturn = 2
        End If
        'WOSL##################################################
        Log ("In SQLDBCopySMB: After SMBClient_Copy_CopyResult")
        'WOSL##################################################

        Sleep (0)
    Else
        iReturn = 1
    End If

I added a couble of log-statements to watch where the exception comes up during release mode. The critical code line is identified:

nSQLFileTotalSize = smbFiles.length

This statement seems to be wrong (working in debug but not in release mode). The idea here is to get the size of the file to use it for a ProgressTimer (show percentage of copying process). The file name was explicitly set before SM2 initialization (very similar like this statement):

    credentials.Share    = "smb://192.168.178.1/HomeNet/TestDB/" & cSQLDatabaseName

Does anybody know how I can get the file size in a correct way before starting the file copy process? Any help is appreciated.

Wosl

PS: in the first attempt I provide a snippet of the rather large app with the critical code but, if necessary, I could spend some time to isolate the issue in a separate test app.

 

[Erel]

You can disable the "network on main thread" check: https://www.b4x.com/android/forum/t...-networkonmainthread-exception.44760/#content

 

[Wosl]

This issue is solved.

The proposed disabling of "network on main thread" as a workaround helped to avoid this exception successfully.

Many thanks to Erel.

Wosl