Find serial-objectquery ("SELECT * from Win32_serialport")

Using System.IO.Ports;
Using System.Management; After adding this sentence, there is still a red wavy line hint that you need to manually add the DLL reference (VS2012)

[ComVisibleAttribute (TRUE)]//Add COM visibility under namespaces

　　　　　String tmpstr1 = "";        String tmpport = "";        list<string> usefulport = new list<string> ();  private void Openacclecomprot () {//com lookup/objectquery query = new ObjectQuery ("SELECT * FROM Win32_serialport ");            Win32_USBControllerDevice ManagementObjectSearcher searcher = new ManagementObjectSearcher (query);            Usefulport.clear ();            int loadcount = 0; Find/foreach (ManagementObject obj2 in searcher) based on the feature you set. Get ()) {if (obj2. properties["Pnpdeviceid"]. Value.tostring (). Contains (@ "usb\vid_26ac&pid_0010")) {//messagebox.show (obj2. properties["Name"].                    Value.tostring ()); TMPSTR1 = Obj2. properties["Name"].                    Value.tostring ();                    Usefulport.add (TMPSTR1);                loadcount++;            }} string[] Allports = Serialport.getportnames (); Foreach (String port in Allports) {if (tmpstr1.                    Contains (port)) {//messagebox.show (port);                Tmpport = port; }            }        }

　　

The most basic USB device structure

Class Usbdeviceinfo        {public            usbdeviceinfo (string DeviceID, String Pnpdeviceid, string description)            { This                . DeviceID = DeviceID;                This. Pnpdeviceid = Pnpdeviceid;                This. Description = Description;            }            public string DeviceID {get; private set;}            public string Pnpdeviceid {get; private set;}            public string Description {get; private set;}        }

The structure of USB serial port

https://msdn.microsoft.com/en-us/library/aa394504 (v=vs.85). aspx

[Dynamic, Provider ("CIMWin32"), UUID ("{98c7e2c7-d592-11d2-b355-00105a0a323a}"), Amendment]class Win32_ usbcontroller:cim_usbcontroller{  uint16   availability;  String   Caption;  UInt32   Configmanagererrorcode;  Boolean  configmanageruserconfig;  String   creationclassname;  String   Description;  String   DeviceID;  Boolean  errorcleared;  String   errordescription;  DateTime installdate;  UInt32   LastErrorCode;  string   manufacturer;  UInt32   maxnumbercontrolled;  String   Name;  String   Pnpdeviceid;  UInt16   powermanagementcapabilities[];  Boolean  powermanagementsupported;  UInt16   protocolsupported;  String   Status;  UInt16   StatusInfo;  String   systemcreationclassname;  String   SystemName;  DateTime timeoflastreset;};

　　

Find serial-objectquery ("SELECT * from Win32_serialport")