Android Question [Solved] B4AException cannot be cast ....String

[mw71]

Hi,

with this Code i get a List from the FTP Server:

FTP.Initialize("FTP",server,port,user,passwort)    'server,port,user,passwort-> string variable
FTP.PassiveMode=True
FTP.List("/")

Wait For FTP_ListCompleted (ServerPath As String, Success As Boolean, FolderS() As FTPEntry, Files() As FTPEntry)

it works fine


Now I made a mistake, entered the wrong FTP address
In this case, Success is false and i call:

CallSubDelayed3(Target,"FTP_Backup_Fin",3,LastException)

The "Target" for LastException is a String Variable.

Wait For FTP_Backup_Fin(SuccessCode as Byte, Error as String)

there crashes the app (with the wrong FTP Server, other errors view o.k.)

LastException is:
(GaiException) android.system.GaiException: android_getaddrinfo failed: EAI_NODATA (No address associated with hostname)

and Crash with:
java.lang.ClassCastException: anywheresoftware.b4a.objects.B4AException cannot be cast to java.lang.String

why the LastException cant cast to string??

 

[DonManfred]

Exceptions cannot be cast to a string.
Change your sub signature of FTP_Backup_Fin to get an OBJECT as last parameter.

 

[Erel]

In the case of "wrapper" objects the target type with CallSub calls must be exact.

Change it to:

Wait For FTP_Backup_Fin(SuccessCode as Byte, Error as Exception)

 

[mw71]

thanks, especially Erel.
When changing to Exception I have seen in the Help (Tooltip) that there (Last)Exception.Message. This works fine.