Cannot convert 'String' to 'const char*'

Projects Programming
1

Hi!

I have an issue with my code for my RFID project. I'm trying to get input from the serial console that is longer than one character. Help?

Code:

  if (option == 'w') {
    while (Serial.available() == 0) {
      String stringVariable( Serial.readString() );
      strcpy(stringBuffer, stringVariable);  // you may try a different string here, with LESS than MAX_STRING_SIZE characters
      int stringSize = strlen(stringBuffer);
      
      // starting from tag's block #1, writes a data chunk labeled "mylabel", with its content given by stringBuffer, of stringSize+1 bytes (because of the trailing 0 in strings) 
      result = rfidReader.writeFile(BLOCK, "mylabel", (byte*)stringBuffer, stringSize+1);
  
      if (result >= 0) {
        printfSerial("--> Successfully written \"%s\" to the tag, ending in block %d\n", stringBuffer, result);
      } else {
        printfSerial("--> Error writing to the tag: %d\n", result);
      }
    }
  
  }

-eetnaviation

2
3

Hmm, while nothing is available to read, try to read a complete string. What am I missing?

And why read a String and not bytes with Serial.readBytes; saves you the strcpy.