ESP32 Forum

I am trying to interact between ArduinoJson and Preferences.h and ESP32WebServer. For reasons too long to go into for this question, I would like to use the getString method in Preferences.h with the following signature:
size_t getString(const char* key, char* value, size_t maxLen);
I have tried many iterations but cannot figure out how to get the method to accept my parameters, including (size_t)197 and size_t s=197;

Rather than waste everyone's time showing all the things I tried, which didn't work, can someone tell me what I should do or if they have the same problem?
Thanks

You don't show where you define jCharArray, but it is an array of char pointers. The first overload of getString wants just a char pointer, or else an array which it will cast to a pointer. The (much simpler) second overload will return a String, and just needs the key name. Try just calling String jString = prefs.getString("sparams"); and then convert that to a char array with jString.c_str() where needed.