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Parsing integer strings?

scorpion

I need help with parsing a string of integers sent from another Arduino. The values will be like this 1, 0, 1234, 1234,

1 is a Boolean

0 is a Boolean

1234 are pot values

I would like for it to go to variables

Vpot is first pot value

Hpot is second pot value

C is first Boolean

Z is second Boolean

 

Thanks,

Ben Bonen

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  • 0

    Hi Ben,

     

    please find below the method I have used in several string parsers with the Arduino boards. This will work for sure.

     

    Enrico

     

    /** \fn int charsToInt(int startChar, int numChars)
    \brief Convert a string from the command to integer


    \param startChar initial character in the command string
    \param numChars number of characters composing the number
    \return The converted interger value
*/
int charsToInt(int startChar, int numChars)
{
    char * value_to_convert;
    String temp = String(6);
    int i;


    for (i = 0; i < numChars; i++)
        temp += cmd.cmdData[i + startChar];


    value_to_convert = temp;
    i = atoi(temp);


    return i;
}

  • 0 in reply to balearicdynamics

    @Enrico Miglino

    Thanks!

    Will this send the values to different variables?

    Ben

  • 0 in reply to scorpion

    Hi Ben,

     

    as this is an independent function, you can call it passing the string you want to parse and use the integer return value as well. About the error correction it is true, there is no error checking and - by my point of view - there is a reason. As this function is used in a parser; I mean, a string parser processing multiple kind of commands with or without parameters, command separators etc. when the conversion is called all the syntax check are already done.

     

    In your case I suggest you check before that the string you send is a valid numeric string that - by a pragmatic point of view - is something independent by the conversion function. In this moment I don't remember what kind of result aoti() call returns when a non-numeric character is passed.

     

    Enrico

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  • 0 in reply to scorpion

    Hi Ben,

     

    as this is an independent function, you can call it passing the string you want to parse and use the integer return value as well. About the error correction it is true, there is no error checking and - by my point of view - there is a reason. As this function is used in a parser; I mean, a string parser processing multiple kind of commands with or without parameters, command separators etc. when the conversion is called all the syntax check are already done.

     

    In your case I suggest you check before that the string you send is a valid numeric string that - by a pragmatic point of view - is something independent by the conversion function. In this moment I don't remember what kind of result aoti() call returns when a non-numeric character is passed.

     

    Enrico

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