尝试在nodejs中捕获继续循环吗？

Question

我正在运行在Oled i2c显示器上打印数据的nodejs有时我收到“ I \ O错误”，这表示电缆问题

但是在我再次运行代码后，一切正常，可以运行几个小时

如何使用try-catch避免此问题？这是代码停止时出现的错误

fs.js:114
    throw err;
    ^

Error: EREMOTEIO: remote I/O error, write
    at Object.writeSync (fs.js:573:3)
    at Bus.i2cWriteSync (/home/pi/node_modules/i2c-bus/i2c-bus.js:348:13)
    at Oled._transfer (/home/pi/node_modules/oled-i2c-bus/oled.js:136:25)
    at Oled.<anonymous> (/home/pi/node_modules/oled-i2c-bus/oled.js:329:12)
    at /home/pi/node_modules/oled-i2c-bus/oled.js:176:9
    at Oled._readI2C (/home/pi/node_modules/oled-i2c-bus/oled.js:160:5)
    at tick (/home/pi/node_modules/oled-i2c-bus/oled.js:171:10)
    at Timeout._onTimeout (/home/pi/node_modules/oled-i2c-bus/oled.js:183:27)
    at ontimeout (timers.js:436:11)
    at tryOnTimeout (timers.js:300:5)

这是我的Try-Catch代码

var myArgs = process.argv.slice(2); //take everything after the 2nd arrg-default!

var api = require('mikronode');
var ping = require('ping');
var i2c = require('i2c-bus'),
i2cBus = i2c.openSync(1),
  oled = require('oled-i2c-bus');

var font = require('oled-font-5x7');

var opts = {
  width: 128,
  height: 32,
  address: 0x3D
};
var oled = new oled(i2cBus, opts);

var dateFormat = require('dateformat');


oled.clearDisplay();
oled.setCursor(1, 1);
//oled.writeString(font, size 1-3, 'text', color 1\0, true\false-wrapping );
oled.writeString(font, 1, 'Startup Finsih!', 1, true);

var Ts=dateFormat(new Date(), "dd/mm/yy H:MM:ss");
oled.setCursor(1, 16);
oled.writeString(font, 1, Ts, 1, true);

var Nosate="";
var device = new api(myArgs[0]);


var host = myArgs;
var pingRepaly;
ping.sys.probe(host,function(isAlive){
var pingRepaly = isAlive ? 'host ' + host + ' is alive' : 'host ' + host + ' is dead';
       // console.log(pingRepaly);
 if (isAlive == true)
 {
     console.log(host + " Router is Online!"  );
     CheckRouter();

 else  
 {
    console.log(host + "Router is Offline!"  );
    process.exit()

 }

});


function CheckRouter(){
console.log('Starting the loop');
console.log('***********************************');

var requestLoop = setInterval(function(){
            device.connect()
    .then(([login])=>{
      return login('admin','MyPassW0rd12!');
    })
    .then(function(conn) {
conn.closeOnDone(true);

var chan3=conn.openChannel("GPS");
   chan3.write('/system/script/environment/print\n?name=UnitGPS\n=.proplist=value');
   chan3.on('done',function(data3){
   Coordinates=data3.data[0][0].value;
   Coordinates = Coordinates.split('!');
   //console.log('Bus GPS Location is :---------->  ' ,Coordinates);
   console.log('Bus GPS Location is :  ' , Coordinates[2],',',Coordinates[1],',',Coordinates[3],',', Coordinates[4]);
   Nosate = Coordinates[4];

   chan3.close();
  // conn.close();
});



console.log(new Date().toString(),'Done \n\n')
    });

if (Nosate < 5)
{
try{
oled.clearDisplay();

Ts=dateFormat(new Date(), "d/m/yy H:MM:ss");
oled.setCursor(1, 0);
oled.writeString(font, 1, Ts, 1, true);
}

catch {}

}



},3000)
}

[出现错误时，它仍会退出代码adnd卡住谢谢，

Answer 1

尝试将代码包装在try/catch中：

var requestLoop = setInterval(function() {
  try {
    device.connect()
      .then(([login]) => { return login('admin','**redacted**'); })
      .then(function (conn) {
        // rest of the code
      });

    // rest of the code
  } catch { }
}, 3000);

这将防止您的程序意外崩溃。

通常来说，吞咽异常（捕获它们却什么也不做）是一个坏主意。您应该尝试对它们执行有意义的操作-例如，登录到文件。