CommPortIdentifier.getPortIdentifiers 为空

CommPortIdentifier.getPortIdentifiers is empty(CommPortIdentifier.getPortIdentifiers 为空)

问题描述

我正在构建一个简单的应用程序，它使用 Java 通信 API javax.comm 通过串行端口进行通信.

I am building a simple application that communicates through Serial Port using the Java Communication API javax.comm.

这是我编写的 java main 方法中的一些代码:

Here is some code in my java main method I wrote:

CommPortIdentifier cpi = null;
        Enumeration e = CommPortIdentifier.getPortIdentifiers();
        while (e.hasMoreElements()) {
            try {
                cpi = (CommPortIdentifier) e.nextElement();
            } catch (NoSuchElementException n) {

            }
            System.out.println(cpi.getName());
        }

枚举 e 始终为空，即使我在运行时连接到 COM 4 端口.

Enumeration e is always empty even though I am connected to a COM 4 port when running this.

另外，运行此代码:

portRead = CommPortIdentifier.getPortIdentifier("COM8");

导致 NoSuchPortException

我认为我已经正确完成了安装部分，并将属性文件、win32com.dll 文件放在了正确的位置.

I think I have done the installation part correctly and placed the properties file, the win32com.dll file in the right places.

你知道问题可能是什么吗?

Do you know what the problem could be?

谢谢

推荐答案

确保win32com.dll(javax.com自带)在jrein目录下.确保 javax.comm.properties(javax.com 附带)在 jdklib 目录中.

Make sure that win32com.dll (comes with javax.com) is in the jrein directory. Make sure javax.comm.properties (comes with javax.com) is in the jdklib directory.

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