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.

This try/catch construct won't work with Arduino C++ : forum.arduino.cc/t/try-catch/180063 — 6v6gt
– 6v6gt, Commented Nov 27, 2022 at 9:57
OK. There is little more to say so I'll present that as the answer. — 6v6gt
– 6v6gt, Commented Nov 27, 2022 at 14:40
Besides that, why do you think that the NTP client is going to throw an exception? — romkey
– romkey, Commented Nov 27, 2022 at 17:34

the busybee · Accepted Answer · 2022-11-28 10:20:52Z

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;
  }

answered Nov 28, 2022 at 10:20

the busybee

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6v6gt · Accepted Answer · 2022-11-27 14:38:53Z

0

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.

answered Nov 27, 2022 at 14:38

6v6gt

1,1906 silver badges9 bronze badges

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 a forum post from 2013 is maybe outdated

Juraj
– Juraj ♦

2022-11-27 15:29:08 +00:00
Commented Nov 27, 2022 at 15:29

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