得到一个USB适配器的COM端口号 [英] get com port number of an USB adapter

问题描述

我想写一个使用一个Arduino万和基于FTDI-USB转RS485适配器的程序。

I am trying to write a program that uses an arduino mega and a FTDI-based USB to RS485 adapter.

我想使程序界面友好，因此，我不惯于用户手动检查COM端口号，但​​我想自动检测到它。下面的代码

I want to make the program user-friendly, thus I don't wont the user to manually check the com port number, but I want to auto-detect it. Here's a snippet of the code

    ManagementScope scope = new ManagementScope();
    SelectQuery query = new SelectQuery("SELECT * FROM Win32_SerialPort");
    ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);

    try
    {
        foreach (ManagementObject item in searcher.Get())
        {
            String description = item["Description"].ToString();
            String deviceID = item["DeviceID"].ToString();

            Console.WriteLine("Porta " + description + " deviceID " + deviceID);

            if (description.Contains("USB Serial Port"))
                return deviceID;
        }
    }
    catch (ManagementException)
    {
    }

这是我无法理解的一点是，为什么我能找到的Arduino（匹配 description.Contains（Arduino的）），但不是USB RS485接口的COM端口。

The point that I am not able to understand is why I can find the USB Serial port of the Arduino (matching description.Contains("Arduino") ) but not the com port of the USB RS485 port.

你有一个想法，为什么会发生这种情况？是查询 SELECT * FROM Win32_SerialPort 错了？

Do you have an idea why this could happen? is the query SELECT * FROM Win32_SerialPort wrong?

推荐答案

好了，经过学习几个论坛，我发现，如果我运行查询关联到USB / RS485适配器的COM端口被列为 SELECT * FROM Win32_PnPEntity 。

Well, after studying several forums, I discovered that the com port associated to the USB/RS485 adapter is listed if I run the query SELECT * FROM Win32_PnPEntity .

但我真的不明白，为什么Arduino的串口通过查询，其他端口与其他查询....我的意思是，那些显示都是USB<！ - >串行适配器

But I really don't understand why the serial port of the arduino is shown by a query and the other port with the other query.... I mean, those are both uSB<->serial adapters!

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