Help removing [" and "] from my vPin HTTP GET

Need Help With My Project
1

I’m using the ESP8266_ReadPin example and it works well. The serial monitor shows my data formatted ["75"]. However I’d like to get the data without the brackets and quotes, so just 75 (end goal being to use this data as an integer (or other) variable).

I know this is not a Blynk thing, but probably C (?) or just basic HTTP stuff. Can anyone share an example if they’ve successfully done this or point me in the right direction?

Thank you!

2

Maybe use isdigit() in the while (client.available()) loop, if true an integer will be the value -‘0’ and you will probably need to count through the loop to see how many digits are in the integer and multiply the left most digit by 10 for 2 digits, 100 for 3 digits.

Post your code if you get something working.

3

Thank you for the recommendation @Costas. I’ll give it a whirl today and post how it turns out!

4

You can hack the string, something like this:

String data = "[75]";
data.remove(0,1); //remove first character.
data.remove(data.length()-1); //remove the last character

After that calling .toInt() on a String will give you the number. See here for some more details: https://www.arduino.cc/en/Reference/StringToInt

5

I’ll play with this as well… didn’t even think about manipulating the string for some reason!

6

Well… success! (below a modification of this Blynk example):

    Serial.print("Read value: ");
    body.remove(0,2);  //  Starting at index 0, remove 2 characters.
    body.remove(body.length() - 2);  // Starting at 2 characters from the end of the string, remove everything after.
    int tempF = body.toInt();  // Convert string to int.
    Serial.println(body);
    Serial.println(tempF + 1);  // Confirm toInt() really worked!

I have a feeling this is a tad less graceful than Costa’s idea… but I’m going to try that next!