String.toCharArray()

Description

Copie les caractères d'un objet String dans un tableau de caractères (char).

Syntaxe

string.toCharArray(buf, len)

Paramètres

  • string: une variable de type String()
  • buf: tableau de char dans lequel stocker les caractères
  • len: la longueur du tableau de char

Valeurs Renvoyées

  • Renvoie un pointeur vers le tableau de caractères interne à l'objet String (de type unsigned char *)

Exemple

void setup() { Serial.begin(9600); String myString = "Arduino"; byte buffer[myString.length() + 1]; myString.toCharArray(buffer, myString.length() + 1); for (int i = 0; i < myString.length() + 1; i++) Serial.println(buffer[i], HEX); } void loop() { }

The result on Serial Monitor:

COM6
Send
41 72 64 75 69 6E 6F 0
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

※ Remarque:

If the string is modified, it is highly recommended using String.reserve() to prevent the memory fragmentation issue

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