Propeller and shared variables

danthony

Does anyone know how to reference a variable outside of the top object from within the top object?

For instance if you had a main object and wanted to get the value from a variable in a child object of that main parent.

Thanks in advance for any help

John Abshier

You could put and use a accessor function in the child object:

PUB GetX
return x

John Abshier

danthony

Would you still have to use a VAR X declaration in both parent and child? I tried it both ways and could not get it to compile.

StefanL38

Hello Danthony,

variables from the VAR-section are only direct accessible from INSIDE that object.

let's say you have a Topobject

MyTopObect.spin

inside the file MyTopObect.spin you have declared another object in the OBJ-section

OBJ
  MyChild : "MyChildObject"

inside the file MyChildObject.SPIN you have a variable in the var-section

VAR
  long MyX 

and you want to READ this variable in the file MyTopObect.spin
for this you have to define a method inside the MyChildObject.SPIN

PUB GetMyX
  result := MyX

now you can READ the value of variable MyX inside the MyTopObect.spin
by coding

  Y := MyChild.GetMyX

if you want to WRITE into variable MyX you have to define a method inside the MyChildObject.SPIN

PUB PutMyX (value)
  MyX := value

and use it inside the the MyTopObect.spin

  MyChild.PutMyX(123)

which wil stor evalue "123" into variable MyX

The names of the variables, objects and methods are free to choose
within the limitations of names in SPIN in general start with letter (and not a digit etc.)


best regards

Stefan

danthony

Thanks. That was super helpful.