How to Convert Byte Array to Char in C++

Question

I don't know how to write a code that convert a byte array to a char array in C++ (using an Arduino board) and publish mqtt. I tried to search but I don't understand.

Example

byte Code[3] = {0x00 ,0x01 , 0x83};
char byteTochar[3];
    
for (int i = 0; i <= 2; i++) {
    Serial.printf("%d", Code[i]);
    Serial.println();
    
    client.publish("publish/data", byteTochar[i]);
}

Error message

converting to 'String' form initializer list would use explicit constructor 'String::String'(unsigned char, unsigned char)'

This is not C, i guess.

Sourav Ghosh
– Sourav Ghosh

2015-08-11 18:22:42 +00:00
Commented Aug 11, 2015 at 18:22 — Sourav Ghosh
– Sourav Ghosh, Commented Aug 11, 2015 at 18:22

ArBel · Accepted Answer · 2015-08-11 18:56:02Z

4

Its actually do c, ArduinoPlayGround http://playground.arduino.cc/Main/Printf.

However, you can just use casting for each element:

char h = (char)Code[i];

edited Aug 11, 2015 at 18:56

answered Aug 11, 2015 at 18:32

ArBel

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5 Comments

Gr4vity4 Over a year ago

sorry i don't understand use byte h = (byte)Code[i]; for convert to char array ?

ArBel Over a year ago

My bad, i changed it. do it for each of the array elements throug a loop and youll get an array of byte. Or you can just convert right before passing the argument.

Gr4vity4 Over a year ago

Thank answer, i will to try :)

Gr4vity4 Over a year ago

i try write code for apply data not work, console not show data message. pastebin.com/VkbyYg3U

ArBel Over a year ago

Please explain what exactly this code should do, cause you passed the wrong params to itoa and you didnt use the char, so i dont get what are you trying to do. However, try to initiate the buffer (str) and read this: cplusplus.com/reference/cstdlib/itoa

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