当端口存在时，为什么我会收到 Java NoSuchPortException?

Why am I getting a Java NoSuchPortException when the port exists?(当端口存在时，为什么我会收到 Java NoSuchPortException?)

问题描述

得到以下生产代码，我正在将其用于新驱动程序.portName 是 COM4 并且这个端口存在于 PC 上(我可以通过超级终端连接到它)，那么为什么 Javacomm 会抛出 NoSuchPortException 呢?COM4 在设备管理器中显示良好.太

Got the following production code below, I'm using it for a new driver. portName is COM4 and this port exists on the PC (and I can connect to it with hyperterminal), so why does Javacomm throw a NoSuchPortException? COM4 shows up fine in device mgr. too

    final String portName = getSerialPort();
    try {
        final CommPortIdentifier id = CommPortIdentifier.getPortIdentifier(portName);
        port = (SerialPort) id.open(getName(), 1000);
    } catch (NoSuchPortException nspe) {
        report(SeverityCode.LEVEL2, getName(), "PIN Pad is not connected to " + portName + " port, or the port does not exist.");
        return;
    } catch (PortInUseException piue) {
        report(SeverityCode.LEVEL2, getName(), portName + " port is already in-use by some other device. Reason: " + piue.getMessage());
        return;
    }

推荐答案

尝试使用 CommPortIdentifier.getPortIdentifiers() 枚举系统上可用的端口列表并打印列出的内容.您确定将 jarfiles 和 dll 安装在正确的文件夹中吗?如果是，则尝试使用 CommPortIdentifier.addPortName(java.lang.String portName, int portType, CommDriver driver) 添加 COM4.您可以将驱动程序参数设置为 null 以使用默认驱动程序.

Try enumerating the list of ports that are available on your system using the CommPortIdentifier.getPortIdentifiers() and print what's listed. Are you sure that you installed the jarfiles and dll in the correct folders? If yes, then try adding COM4 using CommPortIdentifier.addPortName(java.lang.String portName, int portType, CommDriver driver) .You can set the driver parameter to null to use the default driver.

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