Android Question FTP Download not working

aklisiewicz · Jan 25, 2014

Obviously I'm doing something wrong, but cannot figure out what

B4X:

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Dim FTP As FTP
End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")
    Activity.LoadLayout("DownloadUpdates")
    Activity.Title = "Database Update"
    FTP.Initialize("FTP", "ftp.dps.com", 21, "android@dps.com","MyPassword")
End Sub

Sub lblDownload_Click
    FTP.DownloadFile("/public_html/android_db/edbq_rem.db", False, File.DirRootExternal, "edbq_rem.db")
End Sub

is there anything wrong with this code ?

the log generates:
-----------------------------------------------------
** Activity (downloadupdates) Create, isFirst = true **

** Activity (downloadupdates) Resume **

/public_html/android_db/edbq_lite_rem.db, Success=false

java.lang.RuntimeException: Error retrieving file.

500 I won't open a connection to 10.0.2.2 (only to 99.107.150.69)
----------------------------------------------------------------

BTW none of the IPs refers to the FTP server....

where do I call: FTP_DownloadProgress ?

Arthur

Erel · Jan 26, 2014

Is ftp.dps.com a public server? It seems like the device doesn't resolve it to the correct ip address. Try to set the ip address instead.

where do I call: FTP_DownloadProgress ?

You do not need to call it. The event will be raised during download.

aklisiewicz · Jan 27, 2014

yes it is public server, I use FileZilla to login and it works fine with the same credentials.
I tried IP address with the same Error result
Arthur

Erel · Jan 27, 2014

Are you testing it with the emulator?

aklisiewicz · Jan 27, 2014

margret · Jan 27, 2014

I have never had FTP work good on the emulator. Try it on a real device.

aklisiewicz · Jan 27, 2014

OK, where on a device am I supposed to look for downloaded file ? what folder ?

margret · Jan 28, 2014

You posted this code in post #1:

B4X:

Sub lblDownload_Click
     FTP.DownloadFile("/public_html/android_db/edbq_rem.db", False, File.DirRootExternal, "edbq_rem.db")
End Sub

So it should be in the root directory of your external memory card.

aklisiewicz · Jan 28, 2014

something is still wrong...
I checked DirRootExternal - the root folder on my SD card and the file is there but is is 0 bytes.
so there is no download...
the server permissions are set to 644 (hope this is enough)
I attached screenshoot from the debuger

Any ideas what could have be wrong ?

Arthur

Erel · Jan 28, 2014

You should check the value of Success in DownloadComplete event. If it is false then call Log(LastException).

aklisiewicz · Jan 28, 2014

yes I have this Sub

B4X:

Sub FTP_DownloadCompleted (ServerPath As String, Success As Boolean)
    Log(ServerPath & ", Success=" & Success)
    If Success = False Then Log(LastException.Message)
End Sub

so what's the purpose ? how can I debug it ?

margret · Jan 28, 2014

What does the log show? Does the log show "Success"?

aklisiewicz · Jan 28, 2014

OK, I narrow it down to the Path problem on the server
looks like it is working now....

one more question ...

how would I show the progress ?

margret · Jan 28, 2014

Something like this:

B4X:

Sub FTP_DownloadProgress (ServerPath As String, TotalDownloaded As Long, Total As Long)
     Dim zxs As String
 
     If Total > 0 Then
          zxs = "Downloaded " & Round(TotalDownloaded / 1000) & "KB, Out Of " & Round(Total / 1000) & "KB"
     Else
          zxs = "Downloaded " & Round(TotalDownloaded / 1000) & "KB"
     End If
 
     LBLStat.Text = zxs
End Sub

aklisiewicz · Jan 28, 2014

Got it,... I was missing this last line, forgot I need some screen label to show off....

I will sue the opportunity to resolve another issue....

I'm downloading SQLite database (single file).
There is a command to check SQLite database version. I need to compare it against existing database on a device. Is there any way to make a comparison before the download takes place so is the database is the same version the download will be skipped, so the user will not waste bandwidth limit.

Thanks a lot - Arthur

Kintara · Jan 29, 2014

aklisiewicz said:
Got it,... I was missing this last line, forgot I need some screen label to show off....

I will sue the opportunity to resolve another issue....

I'm downloading SQLite database (single file).
There is a command to check SQLite database version. I need to compare it against existing database on a device. Is there any way to make a comparison before the download takes place so is the database is the same version the download will be skipped, so the user will not waste bandwidth limit.

Thanks a lot - Arthur

hi,
I and doing a simular thing. The method I use is to have a CSV file on the server listing the latest versions available with Time and date of issue. The device keeps a simular list of the files it has down loaded.
It is then a simple matter of downloading the Server file and comparing it against the device file.
If its in the server file but not on the device - download
If its a newer one in the server file - download

Hope that helps
Im still playing with the code to make it happen.

Bob

aklisiewicz · Jan 29, 2014

I bet your solution will work but it seems like overkill for what I need. All I need is to compare the file date on the server and on the device (if the database version is hard top retrieve). The only question is how to check the file date on the server without downloading the file ?
Arthur

margret · Jan 29, 2014

You should be able to get what you are looking for from FTP.List. See code below:

B4X:

FTP.List("Your server path goes here")
 
Sub FTP_ListCompleted (ServerPath As String, Success As Boolean, Folders() As FTPEntry, Files() As FTPEntry)
     If Files.Length > 0 Then
          For i = 0 To Files.Length -1
               Log(Files(i).Name)
               Log(Files(i).Size)
               Log(Files(i).Timestamp)
          Next
     Else
          'do whatever is needed here
     End If
End Sub

aklisiewicz · Jan 30, 2014

Thank you Margret - I guess this is what I needed. Will test it and report back.
Arthur

aldomoscarda · Oct 29, 2014

Hello!!
Please help. I use the emulator. I try to download via ftp but does nothing, this is my code:
Sub Button7_Click
Msgbox("comienza descarga","")
Try
File.Delete(File.DirInternal , "emovil.zip")
Catch

End Try
Try
File.Delete(File.DirInternal , "emovil.txt")
Catch

End Try

FTP.Initialize("FTP", "192.168.1.175", 21, "EFARMA2", "ALDOmoscarda2610")

FTP.PassiveMode=False
FTP.DownloadFile("emovil.zip",False, File.DirDefaultExternal , "emovil.zip")
Msgbox("aparentemente solo me comunique sin descargar","")
End Sub
***********************************************************************
Sub FTP_DownloadProgress (ServerPath As String, TotalDownloaded As Long, Total As Long)

Dim s As String
s = "Descargando " & Round(TotalDownloaded / 1000) & "KB"
'Msgbox(s,"")
If Total > 0 Then s = s & " de " & Round(Total / 1000) & "KB"
EditText1.Hint =s

End Sub

thanks

Android Question FTP Download not working

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