How do I pass a array throught a function and return an array - Pointers

2020-02-27T13:48:31.074000Z

Originally created by: rickj

I didn't know the compiler would allow this

FUNCTION myFunc: POINTER
VAR_INPUT
   p_myStrArray: POINTER;
END_VAR

Maybe try this instead

FUNCTION myFunc: POINTER  ARRAY[0..10] OF STRING
VAR_INPUT
   p_myStrArray: POINTER  ARRAY[0..10] OF STRING;
END_VAR[/quote]

Then when you call the function you may try this

VAR
    MyStrArray: ARRAY[0..10] OF STRING;
    PtrReturnArray : POINTER TO ARRAY[0..10] OF STRING;
END_VAR
PtrReturnArray := myFunc(ADR(MyStrArray));

How do I pass a array throught a function and return an array - Pointers

2020-02-27T13:48:31.001000Z

Wrap your array with an fb and pass the fb to the funtion as varinout. Or better, the funtion could be an method of the fb.

If not, you don t know from inside the funtion array dimension.

How do I pass a array throught a function and return an array - Pointers

2020-02-27T13:48:30.884000Z

Hi!

I want to pass a array of strings throught a function and that function is going to return back the array. So I need to use pointers for that.

Let's keep it simple!
I first have my array:

myStrArray: ARRAY[0..10] OF STRING;

Then I need to convert myStrArray to a pointer.

p_myStrArray: POINTER := ADR(myStrArray);

Then I need to pass p_myStrArray throught my function

p_returnArray := myFunc(p_myStrArray);
(*....*)
FUNCTION myFunc: POINTER
VAR_INPUT
   p_myStrArray: POINTER;
END_VAR
VAR
END_VAR
myFunc := p_myStrArray; // Return statement

And then recive my pointer and turn it back to an array

returnArray: ARRAY[0..10] OF STRING;
returnArray := p_returnArray^;

But it won't work for me. What have I missed?

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How do I pass a array throught a function and return an array - Pointers

How do I pass a array throught a function and return an array - Pointers