Parsing integer strings?

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;
}

That might be a bit difficult to implement where the value of vpot falls below 1000.

Hi Paul,

what do you mean with vpot ?

(maybe the method should be generalised a bit more).

Enrico

My interpretation of his question is that he is trying to break the string into four variables.

So

1, 0, 1234, 1234,

would be put into variables

C, Z, Vpot, Hpot

When using code that defines start and length positions you would extract the final value (Hpot) by looking at a starting point of 12 and a length of 4.

In the example string supplied above this would be sufficient to get the value 1234.

The issue with position based referencing is that then the third part of the string fell below 1000 e.g.:

1, 0, 993, 1234,

the final variable would be missing the first digit and only take the remaining 4 digits "234,"

@Paul Ellison

That is true, but that number (1234) was just and example and I am not sure what the actual analog range of a pot is.

So, what if I mapped the input value to a range of 0 to 999 and used that?

Would that work?

Ben

@Paul Ellison

That is true, but that number (1234) was just and example and I am not sure what the actual analog range of a pot is.

So, what if I mapped the input value to a range of 0 to 999 and used that?

Would that work?

Ben

See below for my other response using strtok

strtok will not care how big the number is, it looks for the delimeters and effectivly splits up the string based on them

The code I've provided below might just work regardless of with the pot value runs into 0, 1, 2, 3 or 4 digits. Would you mind giving it a try.

Would be interested to know if it works

Paul, did you forget to include the code? I can't see it.

Neil

Hi neilk

It was posted earlier. Can be found by scrolling down to here:

Re: Parsing integer strings?

Hi gadget.iom

Thanks Paul, got it now.

Neil

You're welcome. Glad it helps somebody.