ESP32 Forum

/*
Using this page as a guide https://randomnerdtutorials.com/esp32-s ... eferences/
the following code prints the following to the serial monitor:

data saved
5
5

why does it not print?
hello
world
*/

#include <Preferences.h>
Preferences preferences;

const char* line1 = "hello";
const char* line2 = "world";

//String line1 = "hello"; // this produces same results
//String line2 = "world"; // this produces same results

void setup() {
Serial.begin(115200);
Serial.println();

preferences.begin("any_name_here", false);
preferences.putString("line1", line1);
preferences.putString("line2", line2);

Serial.println("data saved ");
Serial.println(preferences.putString("line1", line1));
Serial.println(preferences.putString("line2", line2));
preferences.end();
}
void loop() {
}

As always, any and all help appreciated

putString returns the number of characters saved to the key. This can be compared to the expected string length to ensure success. Perhaps you were looking for getString?

Thank you lbernstone
Yes, it is so obvious now.
I cut and pasted from the lines above and did not change putString to getString!

Thanks again.

Case closed