Arduino + 处理代码错误“disabling_serialevent()"

问题描述

我的代码有一些问题，我可以运行它，因为我总是收到此错误消息

I have some problems in my code, i can run it because i always get this error message

错误，为 COM3 null 禁用 serialEvent()

import processing.serial.*;
Serial port;
String c = " ";
String d = " ";
String data = " ";
PFont font;
int index = 0;

void setup() {
    size(2024, 1024);
    port = new Serial(this, "COM3", 9600);

    port.bufferUntil('.');
    font = loadFont("run.vlw");
    textFont(font, 60);
}

void draw() {
    background(150, 50, 200);
    fill(46, 20, 2);
    text(c, 70, 175);
    fill(46, 20, 2);
    text(d, 70, 215);
}

void serialEvent(Serial port) {
    data = port.readStringUntil('.');
    data = data.substring(0, data.length() - 1);
    index = data.indexOf(",");
    c = data.substring(0, index);
    d = data.substring(index + 1, data.length());
}

我是这方面的新手，如果我犯了大错，抱歉.

I am new in this thing, sorry if i made a big mistake.

推荐答案

您的 serialEvent() 代码不处理异常.您对串行数据的处理可能包含一个错误，该错误随后会导致未处理的 StringIndexOutOfBoundsException，因此程序崩溃.可以肯定的是，我们需要了解通过COM3 传输的实际数据.所以这里有两个建议:

Your serialEvent() code doesn't handle exceptions. It is likely that your handling of the serial data contains an error which subsequently causes an unhandled StringIndexOutOfBoundsException, so the program crashes. To be sure, we would need knowledge of the actual data that gets transmitted via COM3.So here are two suggestions:

1. 将整个代码放在 serialEvent() 中的 try/catch 块中，并打印出异常的堆栈跟踪.这应该会为您提供有关导致崩溃的原因的更多提示.
2. 编辑您的问题并添加 Arduino 串行监视器输出的片段.

1. Put the whole code inside of serialEvent() in a try/catch block and print out the exception's stack trace. This should give you more hints about what causes the crash.
2. Edit your question and add a snippet of your Arduino Serial Monitor's output.

还不能发表评论，所以我必须将此作为答案发布.

Can't comment yet, so I have to post this as an answer.

这篇关于Arduino + 处理代码错误“disabling_serialevent()"的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！