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I am getting an int value from one of the analog pins on my Arduino. How do I concatenate this to a String and then convert the String to a char[]?

It was suggested that I try char msg[] = myString.getChars();, but I am receiving a message that getChars does not exist.

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2 Answers

up vote 17 down vote accepted

  1. To convert and append an integer, use operator += (or member function concat): 

    String stringOne = "A long integer: ";
stringOne += 123456789;

  2. To get the string as type char[], use toCharArray():

    char charBuf[50];
stringOne.toCharArray(charBuf, 50)

In the example, there is only space for 49 characters (presuming it is terminated by null). You may want to make the size dynamic.

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Saved me a lot of tinkering time. Thanks! In order to make the char[] size dynamic, do something like char charBuf[stringOne.length()+1] – loeschg Mar 23 '12 at 19:37
I did it dynamically like this: char ssid[ssidString.length()]; ssidString.toCharArray(ssid, ssidString.length()); – dumbledad Dec 14 '12 at 13:45
up vote -1 down vote

Unfortunately, I can't test at the moment, but one option would be to split your prints. For example,

Serial.print("analogValue:\t");
Serial.print(analogRead(0));
Serial.print("\n");

Or you should be able to use std functions, like itoa() (int to ASCII) or others.

Serial.println("analog value: " + itoa(analogRead(0)));

(You might need includes at the top of your code for itoa (

#include <stdio.h>
#include <stdlib.h>

))

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I am not trying to do a Serial Print, I am trying to concatenate a Char variable and a String into one long Char variable. – Chris Sep 12 '11 at 15:01
1  
-1 I can't see how this is an answer – dumbledad Dec 14 '12 at 13:41

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