How I can make array from String ?

Projects Programming
1

Hello,

probably a basic question :frowning: :frowning: :
How I can convert from String with example value like this "1,2,3,4,5,6,7,8,9"
to a array from this type:
unsigned int my_array[] = {1,2,3,4,5,6,7,8,9};

Thanks in advance!

2

Using the relevant cstring functions and reading Robin' Serial tutorial

(Or replace the quotes with {} :slight_smile: )

3

Why is it in a String in the first place ?

4 
char input[] = "1,2,3,4,5,6,7,8,9";
int output[10];
byte parsed;

void setup() {
  Serial.begin(250000);
  for (char* pch = strtok (input, ","); pch != NULL; pch = strtok (NULL, ",")) {
    output[parsed++] = atoi(pch);
  }
  Serial.print(F("output["));
  Serial.print(parsed);
  Serial.print(F("] = { "));
  for (byte i = 0; i < parsed; i++) {
    Serial.print(output[i]);
    Serial.print(F(", "));
  }
  Serial.println(F("};"));
}
void loop() {}

output[9] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, };
5 
const char input[] = "1,2,3,4,5,6,7,8,9";
byte out[9];
sscanf(input,"%d,%d,%d,%d,%d,%d,%d,%d,%d",out,out+1,out+2,out+3,out+4,out+5,out+6,out+7,out+8);
6

J-M-L:

const char input[] = "1,2,3,4,5,6,7,8,9";

byte out[9];
sscanf(input,"%d,%d,%d,%d,%d,%d,%d,%d,%d",out,out+1,out+2,out+3,out+4,out+5,out+6,out+7,out+8);

but that would only work for a case with a length of 9. Would need rewriting for longer or shorter inputs. Not good!

7

That matches the requirements

Poor spec, poor answer :slight_smile:

8

First thanks all for the replies and provided solutions.

UKHeliBob:
Why is it in a String in the first place ?

Well because in my case I would like to use MQTT to pass some payload with ready data - but it will be received as string right.

J-M-L:
That matches the requirements

Poor spec, poor answer :slight_smile:

:slight_smile: freelancer?

Thanks again

9

but it will be received as string right.

Received from where ?

If the Arduino is receiving the data via a serial interface then it is highly unlikely that it needs to be s String in the first place. Can you please post the code that receives the data.

10

So here is the setup I have :

ESP8266 subscribed for several topics in MQTT. Based on the topic Controller will send Infra red commands to IR Led.
Client of MQTT is a web page raising the topics with messages.

There are several topics, which are specific and it is easy to send their code.
But I have also a generic(general) topic, and idea here is that I would like to re-send RAW data coming with the topic and inside message.

Let me know if you need more details on this