How to get device id and post device id to http for electron?

i got device id for electron and i need to post to http,
i am getting error because device id is String object and i need to post to http as char array

thanks for reply, will try it

i used string.tocharArray() to store in char array but it not prints device id to serial port when called Serial.println()

Can you post your exact code?

char id[12];
void setup() 
{
  pinMode( D7, OUTPUT);
  	
  Particle.publish("App Started");
 
  Serial.begin(9600);
  Serial4.begin(9600);//  carbon monoxide sensor
  
  Serial.println("Hello World!");
  
  String MyId = System.deviceID();
 
  
  MyId.toCharArray(id, sizeof(id));
  
  Serial.println(id);
}

got it i need to declare char id[] much bigger to store device id

I just tested your coud (with my alterations) and do see the device ID just fine

char id[25];
void setup() 
{
  pinMode(D7, OUTPUT);
  Particle.publish("App Started");
  Serial.begin(9600);
  Serial4.begin(9600);//  carbon monoxide sensor
  System.deviceID().toCharArray(id, sizeof(id));
  Serial.println(id);
  Serial.println("Hello World!");
}

void loop() {
  delay(1000);
  Serial.println(id);
  digitalWrite(D7, !digitalRead(D7));
}

thanks ScruffR. i am getting device id also posting to http