How to change the values of a system variable via Karel??

Hi A_ghost,

SET_VAR is the correct routine.

- Figure out the correct sysvar name e.g. '$XY_VAR[2].$A_Value'

- set prog_name to '*SYSTEM*'

- use the status var (with POST_ERR) to debug your code and get more information about your error(s)

- check the information the compiler/translater gives you

Best regards

The system variable "$EADER_FRM " you are are using doesn't seem to be a standard system variable, could you show the path you are taking to get to your screen?

Below is an example of how you can use the SET_VAR instruction in a Karel Routine (note: the parameter name might not be correct):

PROGRAM VAR_SET

--Translation Directive to work with system variables

%ENVIRONMENT sysdef

--Variable Definitions

VAR

status: INTEGER

tempInteger:INTEGER

parameter: STRING[40]

value: REAL

--Program Logic

BEGIN

parameter = '$EADER_FRM[1].$X'

value = 563.000

SET_VAR(tempInteger, '*SYSTEM*',parameter, value,status)

END VAR_SET

Hi

as I wrote in my first answer:

Quote

- use the status var (with POST_ERR) to debug your code and get more

information about your error(s)

e.g.

SET_VAR(.....,status)

IF status <> 0 THEN POST_ERR(status, '', 0, 2) ENDIF

And, are you sure you have to set these vars via karel?

I think it might be dangerous to edit the COORD-Frames directly, unless you really know what you're doing...

best regards

Hello A_ghost,

I have similar problem with another sys var

Thread

Karel set_var problem

Hello everyone,

I have some trouble to set variable that don't have $ before it. Is it possible?

(Code, 28 lines)

niram83

August 9, 2023 at 10:34 AM

B.R.

Hi guys, I want to change the name of a variable ($pro_cfg.$prog_name) but in Karel it doesn't let me and I can't do it from the TP either. I wanted to make it equal to an SR (string Register). Any idea on how to change the name?

Hi A_ghost,

I saw that you only do a check of status var at the end?

Why did'nt you do this

Quote from PnsStarter

IF status <> 0 THEN POST_ERR(status, '', 0, 2) ENDIF

directly after a builtin where you get a status ?

@ssaul what is "$pro_cfg.$prog_name" used for?

what error code do you get?

Quote from PnsStarter

@ssaul what is "$pro_cfg.$prog_name" used for?

what error code do you get?

The variable $pro_cfg.$prog_name saves the name of the program that will be analyzed in Motion Profiler. I want to automate it to change the name of the program without having to go to the teach pendant.

Hi ssaul,

have you tried with SET_VAR builtin? Please try.

Info: Not all sysvars are directly supported within RG (maybe you have to set an(other) %environment), if not familiar with that, use SET_VAR.

Quote from PnsStarter

Hi ssaul,

have you tried with SET_VAR builtin? Please try.

Info: Not all sysvars are directly supported within RG (maybe you have to set an(other) %environment), if not familiar with that, use SET_VAR.

hi PnsStarer

Currently this is my program, but I think the variable is not available for karel

PROGRAM set_prog_name
VAR
prog_name : STRING[32] -- Variable para almacenar el nombre del programa
status : INTEGER -- Variable para almacenar el estado de la operación
BEGIN
-- Inicializar la variable de estado
status = 0

-- Leer el valor de SR[1] y almacenarlo en prog_name
GET_STR_REG(1, prog_name, status)

-- Verificar si la operación de lectura fue exitosa
IF status = 0 THEN
-- Asignar el valor de prog_name a $PRO_CFG.$PROG_NAME
$PRO_CFG.$PROG_NAME = prog_name
-- Mostrar un mensaje de confirmación
WRITE('El nombre del programa ha sido establecido a: ', prog_name, CR)
ELSE
-- Mostrar un mensaje de error
WRITE('Error al leer el registro de cadena SR[1]', CR)
ENDIF
END set_prog_name

-- Asignar el valor de prog_name a $PRO_CFG.$PROG_NAME
SET_VAR(ENTRY, '*SYSTEM*', '$PRO_CFG.$PROG_NAME', prog_name, STATUS)
IF STATUS <> 0 THEN;POST_ERR(STATUS, '', 0, 2);ENDIF	

you have also to add "ENTRY : integer" to var section...

please get familiar with the (common) builtins..

I haven't tested and I won't give you FULL program.... learning while coding

Quote from PnsStarter

Code

-- Asignar el valor de prog_name a $PRO_CFG.$PROG_NAME
SET_VAR(ENTRY, '*SYSTEM', '$PRO_CFG.$PROG_NAME', prog_name, STATUS)
IF STATUS <> 0 THEN;POST_ERR(STATUS, '', 0, 2);ENDIF	

you have also to add "ENTRY : integer" to var section...

please get familiar with the (common) builtins..

I haven't tested and I won't give you FULL program.... learning while coding

I don't want you to write the code, I just need to know if you can use the variable in Karel because I think it's protected.

Hi ssaul

now I'm confused!

Quote from ssaul

I just need to know if you can use the variable in Karel because I think it's protected.

What do you mean? It's writeable.

But I do not know if it's is 'allowed' to change this 'manually' since this var is part of a struct so maybe you'll get unwanted behavior..

Quote from PnsStarter

Hi ssaul

now I'm confused!

What do you mean? It's writeable.

But I do not know if it's is 'allowed' to change this 'manually' since this var is part of a struct so maybe you'll get unwanted behavior..

Hello, good morning. It won't let me write it, hahaha. I write it, and the variable doesn't change color to indicate that it's being viewed. Sorry for my English. I use a translator.