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Convert string to byte array.

damian177
2021-12-26
2021-12-29
  • damian177

    damian177 - 2021-12-26

    Hi,
    Please help me how create the function to convert STRING variable e.g:
    'AFDA0909090909'
    to byte array:
    0xAF, 0xDA, 0x09, 0x09, 0x09, 0x09, 0x09

    ?

     
  • damian177

    damian177 - 2021-12-26

    My temporary solution:

    FUNCTION ASCIIstring_TO_BYTE : BYTE
    VAR_INPUT
        InputVal1: STRING(1);
        InputVal2: STRING(1);
    END_VAR
    VAR
        CharAsByteH:BYTE;
        CharAsByteL:BYTE;
        state1:BYTE;
        state2:BYTE;
    
    END_VAR
    
    
     state1 := 0;
     state2 := 0;
    
    
    IF InputVal1 = '0' THEN   state1 := 1; END_IF;
    IF InputVal1 = '1' THEN   state1 := 2; END_IF;
    IF InputVal1 = '2' THEN   state1 := 3; END_IF;
    IF InputVal1 = '3' THEN   state1 := 4; END_IF;
    IF InputVal1 = '4' THEN   state1 := 5; END_IF;
    IF InputVal1 = '5' THEN   state1 := 6; END_IF;
    IF InputVal1 = '6' THEN   state1 := 7; END_IF;
    IF InputVal1 = '7' THEN   state1 := 8; END_IF;
    IF InputVal1 = '8' THEN   state1 := 9; END_IF;
    IF InputVal1 = '9' THEN   state1 := 10; END_IF;
    IF InputVal1 = 'A' THEN   state1 := 11; END_IF;
    IF InputVal1 = 'B' THEN   state1 := 12; END_IF;
    IF InputVal1 = 'C' THEN   state1 := 13; END_IF;
    IF InputVal1 = 'D' THEN   state1 := 14; END_IF;
    IF InputVal1 = 'E' THEN   state1 := 15; END_IF;
    IF InputVal1 = 'F' THEN   state1 := 16; END_IF;
    
    
    IF InputVal2 = '0' THEN   state2 := 1; END_IF;
    IF InputVal2 = '1' THEN   state2 := 2; END_IF;
    IF InputVal2 = '2' THEN   state2 := 3; END_IF;
    IF InputVal2 = '3' THEN   state2 := 4; END_IF;
    IF InputVal2 = '4' THEN   state2 := 5; END_IF;
    IF InputVal2 = '5' THEN   state2 := 6; END_IF;
    IF InputVal2 = '6' THEN   state2 := 7; END_IF;
    IF InputVal2 = '7' THEN   state2 := 8; END_IF;
    IF InputVal2 = '8' THEN   state2 := 9; END_IF;
    IF InputVal2 = '9' THEN   state2 := 10; END_IF;
    IF InputVal2 = 'A' THEN   state2 := 11; END_IF;
    IF InputVal2 = 'B' THEN   state2 := 12; END_IF;
    IF InputVal2 = 'C' THEN   state2 := 13; END_IF;
    IF InputVal2 = 'D' THEN   state2 := 14; END_IF;
    IF InputVal2 = 'E' THEN   state2 := 15; END_IF;
    IF InputVal2 = 'F' THEN   state2 := 16; END_IF;
    
    CASE state1 OF
    1 : CharAsByteH:=16#00;
    2 : CharAsByteH:=16#01;
    3 : CharAsByteH:=16#02;
    4 : CharAsByteH:=16#03;
    5 : CharAsByteH:=16#04;
    6 : CharAsByteH:=16#05;
    7 : CharAsByteH:=16#06;
    8 : CharAsByteH:=16#07;
    9 : CharAsByteH:=16#08;
    10 : CharAsByteH:=16#09;
    11 : CharAsByteH:=16#0A;
    12 : CharAsByteH:=16#0B;
    13 : CharAsByteH:=16#0C;
    14 : CharAsByteH:=16#0D;
    15 : CharAsByteH:=16#0E;
    16 : CharAsByteH:=16#0F;
    END_CASE;
    
    CASE state2 OF
    1 : CharAsByteL:=16#00;
    2 : CharAsByteL:=16#01;
    3 : CharAsByteL:=16#02;
    4 : CharAsByteL:=16#03;
    5 : CharAsByteL:=16#04;
    6 : CharAsByteL:=16#05;
    7 : CharAsByteL:=16#06;
    8 : CharAsByteL:=16#07;
    9 : CharAsByteL:=16#08;
    10 : CharAsByteL:=16#09;
    11 : CharAsByteL:=16#0A;
    12 : CharAsByteL:=16#0B;
    13 : CharAsByteL:=16#0C;
    14 : CharAsByteL:=16#0D;
    15 : CharAsByteL:=16#0E;
    16 : CharAsByteL:=16#0F;
    END_CASE;
    
    ASCIIstring_TO_BYTE:= SHL(CharAsByteH,4) OR CharAsByteL;
    

    And function call:

    byteMy:=ASCIIstring_TO_BYTE('A','F');
    

    I need more profesional solution. :)

     

    Last edit: damian177 2021-12-26
  • h-hermsen

    h-hermsen - 2021-12-26

    It seems your solution is KISS, it is readable, understandable and it works. Problem solved if you ask me πŸ’₯βœ¨πŸŒŸπŸ‘πŸ’ͺ Happy Christmas β›„πŸŽ„

     
    πŸ‘
    1
    • h-hermsen

      h-hermsen - 2021-12-29

      I just knew people weren't going to let this go by :-)
      The for loop solution js offcourse more elegant and shorter. Anyway Happy New Year!

       
  • dFx

    dFx - 2021-12-27

    Did you had a look at OSCATT lib ? HEX_TO_BYTE seems to apply.

    Also there is WORD_AS_STRING in utils, but you need the exact opposite.

     

    Last edit: dFx 2021-12-27
  • damian177

    damian177 - 2021-12-27

    ... This examle works:

    byteMy:=ASCIIstring_TO_BYTE('A','F');
    

    But in this example is problem:

    VAR
    ASCIIarray:STRING:='DFAFFF0001';
    bytes_array: ARRAY[0..100] OF BYTE;
    END_VAR
    
    FOR iCount:=0 TO 10 DO
        IF (iCount MOD 2) = 0 THEN
            bytes_array[iCountTT] := ASCIIstring_TO_BYTE((ASCIIarray[iCount]),(ASCIIarray[iCount+1]));
            iCountTT:=iCountTT+1;
        END_IF
    END_FOR
    

    The error is:
    Cannot convert type 'BYTE' to type 'STRING(1)' ...

    Function STRING_TO_BYTE not resolved problem. How do I pass one character from STRING to a function?

     

    Last edit: damian177 2021-12-27
  • dFx

    dFx - 2021-12-27

    actually, looping from 0 to 10 is 11 loops on a string of 10 chars.

    then if you want to get a byte value, don't concatenate 2 chars into a word. just take lower byte once at a time.

     
  • damian177

    damian177 - 2021-12-27

    So how do I pass a single character from string to my function named: ASCIIstring_TO_BYTE?

     
  • damian177

    damian177 - 2021-12-27

    So, maybe have you idea how convert this 1D Array :

    ASCIIarray : STRING(255) := 'AFDFAFFFFF';

    to 2D ARRAY:

    ASCIIarray2 : ARRAY[0..0, 0..4] OF STRING := ['AF', 'DF', 'AF', 'FF', 'FF'];

    ?

     
  • dFx

    dFx - 2021-12-29
        FOR Index := 0 TO 9 DO
            MyBytes[Index] := HEXinASCII_TO_BYTE(MyStr[Index]);
        END_FOR
    

    OR

        FOR Index := 0 TO 4 DO
            MyBytes[Index] := SHL(HEXinASCII_TO_BYTE(MyStr[Index*2]),4) + HEXinASCII_TO_BYTE(MyStr[Index*2 + 1]);
        END_FOR
    

    HEXinASCII_TO_BYTE is part of Util lib.

    Sometimes things are easier than it first look.

     
    πŸ‘
    2

    Last edit: dFx 2021-12-29
  • damian177

    damian177 - 2021-12-29

    Thanks, but what do you think about other conversion. I would like to change byte array :0x44, 0x44, 0x46, 0xFF, 0xFF
    on string value :
    '444446FFFF' ? How do this ?

     
  • dFx

    dFx - 2021-12-29
        FOR Index := 0 TO 7 DO
            MyBytes[Index] := SHL(HEXinASCII_TO_BYTE(MyStr[Index*2]),4) + HEXinASCII_TO_BYTE(MyStr[Index*2 + 1]);
        END_FOR
        FOR Index := 0 TO 7 DO
            MyStr2[Index*2+1] := TO_BYTE(BYTE_TO_HEXinASCII(MyBytes[Index]));
            MyStr2[Index*2] := TO_BYTE(BYTE_TO_HEXinASCII(SHR(MyBytes[Index],4)));
        END_FOR
    

    Same lib. Please read a little the help.

     
  • dFx

    dFx - 2021-12-29

    Note for future me : do not spam the post button.

     

    Last edit: dFx 2021-12-29

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