Arduino Error: cannot convert 'String' to 'char' for argument '1' to 'char strtok(char, const char)'

Question

I'm working on an arduino assignment that splits an incoming string and puts the terms of the string in 6 different variables( a sample input string when split up has 6 terms). i have the following error popping up: cannot convert 'String' to 'char*' for argument '1' to 'char* strtok(char*, const char*)' . Can you guys suggest changes to the code to get it right ?

String str(" ");
char a[5],b[5],c[5],d[5],e[5],f[5];
char *token = strtok(str, " ");


void setup()
{
Serial.begin(9600);

 }
void loop(){
while (!Serial.available());
str = Serial.readStringUntil('\n');
Serial.println(str);

strcpy(a,token);

token = strtok(NULL, " ");
strcpy(b,token);
token = strtok(NULL, " ");
strcpy(c,token);
token = strtok(NULL, " ");
strcpy(d,token);
token = strtok(NULL, " ");
strcpy(e,token);
token = strtok(NULL, " ");
strcpy(f,token);

Serial.println(a);
Serial.println(b);
Serial.println(c);
Serial.println(d);
Serial.println(e);
Serial.println(f);
}

enter code here

VLL · Accepted Answer · 2020-05-13 07:38:13Z

3

You need to convert str to char array, because strtok expects char* argument, not String.

String str("...");
char str_array[str.length()];
str.toCharArray(str_array, str.length());
char* token = strtok(str_array, " ");

edited May 13, 2020 at 7:38

answered Jun 21, 2018 at 11:59

VLL

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Mohammad Lotfi · Accepted Answer · 2021-02-08 19:28:19Z

3

// Define 
String str = "This is my string"; 

// Length (with one extra character for the null terminator)
int str_len = str.length() + 1; 

// Prepare the character array (the buffer) 
char char_array[str_len];

// Copy it over 
str.toCharArray(char_array, str_len);

answered Feb 8, 2021 at 19:28

Mohammad Lotfi

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