Passing variable into catch() exception

Question

I'm working with a try{} catch(){} exception right now and I want to change a Variable. For this my board has to connect to the Internet and with a try{} statement it will try to do so. If it fails I simply want to set the variables to 0.

 try {
 timeClient.update();
 ntp_seconds = timeClient.getSeconds();
 ntp_minutes = timeClient.getMinutes();
 ntp_hours = timeClient.getHours();
 } 
 catch () {
 ntp_seconds = 0;
 ntp_minutes = 0;
 ntp_hours = 0;
 }

I am getting this error: Compilation error: expected type-specifier before ')' token I know that I somehow have to pass my variables into the catch() "function" but somehow I can't pass variables in like I would with normal functions.

• 6v6gt: This try/catch construct won't work with Arduino C++ : forum.arduino.cc/t/try-catch/180063
• 6v6gt: OK. There is little more to say so I'll present that as the answer.
• romkey: Besides that, why do you think that the NTP client is going to throw an exception?

Answer 1

You might want to refresh your knowledge about the try-catch statement by reading the respective chapter in your C++ book.

You need to declare an exception parameter in catch, which you can ignore:

 try {
 timeClient.update();
 ntp_seconds = timeClient.getSeconds();
 ntp_minutes = timeClient.getMinutes();
 ntp_hours = timeClient.getHours();
 } 
 catch (exception& ignored) {
 ntp_seconds = 0;
 ntp_minutes = 0;
 ntp_hours = 0;
 }

Answer 2

The Arduino IDE does not support the C++ try/catch exception handling construct and explicitly disables this feature. See: https://forum.arduino.cc/t/try-catch/180063 for a fuller explanation.

• Juraj: how does IDE disable it? the build commands are in platform.txt of each platform. a forum post from 2013 is maybe outdated