Variable size array

Engineering 🇬🇧
lucaver89
2020-04-25
2020-04-25

  • lucaver89 - 2020-04-25

    Hi to all,

    I've a little problem with the operator sizeof that is not working with in_out vars. In my case the code is very simple like below:

    FUNCTION_BLOCK fb1
VAR_IN_OUT
    my_array    :ARRAY[*] OF STRING;
END_VAR

VAR_OUTPUT
    dimension :UINT;
END_VAR

VAR
END_VAR


dimension := sizeof(my_array)/sizeof(my_array[0]);

    PROGRAM PLC_PRG
VAR
    array1          :ARRAY[0..100] OF STRING;

    pi              :fb1;

    dim1, dim2     :UINT;
END_VAR

pi(my_array := array1, dimension=>dim1);

dim2 := SIZEOF(array1)/SIZEOF(array1[0]);

    In this case the result of dim1 is zero, and the result of dim2 is 101. How can I calculate the right dimension from function block?

    thanks
    Luca

     

    Last edit: lucaver89 2020-04-25

  • i-campbell

    i-campbell - 2020-04-25

    Upper_Bound(my_array,1) - Lower_Bound(my_array,1) + 1

     

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