Android Question Problem with CallSub

[F.Campanella]

Hi, I have this problem:

I have a lot of classes that have common methods. One common method is called "getDBPrefix"
I called this in a module that I call in a other module
At nested module i pass the istance of object and I call Callsub(object, "GetDBPrefix") but return the following error

What Am I wrong?

Error occurred on line: 194 (CLDB)
java.lang.NullPointerException
at anywheresoftware.b4a.B4AClass$ImplB4AClass.getActivityBA(B4AClass.java:20)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)

Thanks for your help

 

[Erel]

Does it work if you rename the sub to GetDBPrefix instead of getDBPrefix? getDBPrefix is a property.

 

[F.Campanella]

no, not work. If I call same sub in the primary module does work, in the nested module don't work.
My class have several properties and I call CallSub when I not know the type of the object.

Example:
Class CLGestOrdClienti

Public Sub getDBPrefix As String
Return "cli"
End Sub

Primary module:

Dim a as string = CallSub(Cliente, "GetDBPrefix") //Work, but if I hover the mouse around the row return the error: "sub not found", but work correctly

in the same module call this:

Dim Cliente as CLCollection = DBUtil.LoadCollection(Cliente)

in the DBUtil module, at the sub LoadCollection I call this:

Dim DBPrefix as string = CallSub(pObject, "GetDBPrefix") // DON'T WORK, pObject is the istance of the object Cliente passed in the primary module (DBUtil.LoadCollection(Cliente))

Why? :-(

P.S. I am using the simulator, not the real device.

 

[Troberg]

Have you tried renaming it to something completely different, such as RetrieveDBPrefix. I've had problems with using get* and Get*.

 

[DonManfred]

I've had problems with using get* and Get*.

get* is considered as property, Get* is a Method.

 

[F.Campanella]

Ok, I'm using this to read the properties. I can read the properties of a class through CallSub?

I used this technique with the suggestion of Erel:

https://www.b4x.com/android/forum/threads/b4i-and-reflection.47570/#post-294725

 

[F.Campanella]

Curious!!!
the problem is if I use the simulator, if I use the real device works!