RXTX版本不匹配 [英] Mismatched RXTX Versions

问题描述

我找到了一个通过Java通过串行端口与Arduino进行通信的代码，并想尝试使其正常工作以扩展其在项目上的想法，但我一直遇到此错误

I found a code to communicate in Java via Serial Port to an Arduino and wanted to try and get it working in order to expand on it for a project idea, but I keep getting this error

Stable Library
=========================================
Native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Java lib Version   = RXTX-2.1-7
WARNING:  RXTX Version mismatch
Jar version = RXTX-2.1-7
native lib Version = RXTX-2.2-20081207 Cloudhopper Build rxtx.cloudhopper.net
Could not find COM port.
Started

我认为这意味着RXTX库存在jar不匹配的情况，但是本机lib中的内部版本链接不再是一个网站.我不确定如何解决该问题.如果您认为这是问题，请在下面输入我的代码.任何帮助将不胜感激.

I think that it means there is jar mismatch for the RXTX library, but the link to the build in the native lib is a website is no longer there. I'm not exactly sure how to fix the problem. My code is below if you believe that is the issue. Any help would be appreciated.

import java.io.OutputStream;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.InputStream;
import java.util.Enumeration;

public class AraInterface {
SerialPort serialPort;
        /** The port we're normally going to use. */
        private static final String PORT_NAMES[] = { 
                        "/dev/tty.usbserial-A9007UX1", // Mac OS X
                        "/dev/ttyUSB0", // Linux
                        "COM35", // Windows //shin: ardu com port here
                        };
        private InputStream input;
        private OutputStream output;
        private static final int TIME_OUT = 2000;
        private static final int DATA_RATE = 9600;

        public void initialize() {
                CommPortIdentifier portId = null;
                Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

                while (portEnum.hasMoreElements()) {
                        CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
                        for (String portName : PORT_NAMES) {
                                if (currPortId.getName().equals(portName)) { 
                                        portId = currPortId;
                                        break;
                                }
                        }
                }

                if (portId == null) {
                        System.out.println("Could not find COM port.");
                        return;
                }

                try {
                        serialPort = (SerialPort) portId.open(this.getClass().getName(),
                                        TIME_OUT);

                        serialPort.setSerialPortParams(DATA_RATE,
                                        SerialPort.DATABITS_8,
                                        SerialPort.STOPBITS_1,
                                        SerialPort.PARITY_NONE);

                        input = serialPort.getInputStream();
                        output = serialPort.getOutputStream();

                        serialPort.addEventListener((SerialPortEventListener) this);
                        serialPort.notifyOnDataAvailable(true); 
                } catch (Exception e) {
                        System.err.println(e.toString());
                }
        }

        public synchronized void close() {
                if (serialPort != null) {
                        serialPort.removeEventListener();
                        serialPort.close();
                }
        }

        public synchronized void serialEvent(SerialPortEvent oEvent) {
                if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
                        try {
                                int available = input.available();
                                byte chunk[] = new byte[available];
                                input.read(chunk, 0, available);

                                String temp = new String (chunk);
                                String ref = "Hel";
                                if(temp.compareTo(ref)==0){
                                System.out.println("Hello World request received");
                                }
                                else{
                                System.out.println("lala" + temp);
                                }

                        } catch (Exception e) {
                                System.err.println(e.toString());
                        }
                }

        }

        public static void main(String[] args) throws Exception {
                AraInterface main = new AraInterface();
                main.initialize();
                System.out.println("Started");
        }
}

推荐答案

1. 检查是否已安装库.如果没有，对于Ubuntu， sudo apt-get install librxtx-java
2. 如果已安装， 转到安装路径---在我的情况下/usr/share/java/RXTXcomm.jar
3. 如果您正在使用Ubuntu或任何Linux发行版，请从Eclipse构建路径中删除所有下载的rxtx库，并在步骤2中添加已安装的rxtx库的路径.您还可以将其复制到您的项目中.
4. 检查您的Java库属性(System.getProperty("java.library.path"))以了解该文件夹.
5. 将librxtxSerial.so复制到Java库路径-就我而言 sudo cp -r /usr/lib/jni/librxtxSerial.so /usr/lib/x86_64-linux-gnu

1. Check if you have installed the library. If not, in case of Ubuntu, sudo apt-get install librxtx-java
2. If already installed, go to the path of the installation --- in my case /usr/share/java/RXTXcomm.jar
3. If you are using Ubuntu or any Linux distro, remove any downloaded rxtx library from Eclipse build path, and add the path of the installed rxtx library in step 2. You can also copy it into your project.
4. Check your java library property (System.getProperty("java.library.path")) to know the folder.
5. Copy the librxtxSerial.so to the Java library path - in my case sudo cp -r /usr/lib/jni/librxtxSerial.so /usr/lib/x86_64-linux-gnu

之后，请再次尝试您的代码.

After that try your code again.

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