help in COM port identification using PCMCIA card

I have written a code in vb.net to get the guid for all the ports in the device manager, get the device id connected to each com port, enumerate the ports and see whether the vendor id and product id which i  get from the pci card matches with any of them in the com port.if so  send at commands

i am getting the guid for the ports using the class SetDiGetGuidfromClassName function. In this function I pass the class name such as "Ports" / "PCI" etc to get the guid.i tried callign this function and that is returning a  guid in this formant 0000-0000-000-00000 basically a null string.
What might be the issue?

Cheers,
YH
yaminihariAsked:
Who is Participating?
 
WilliamConnect With a Mentor Commented:
OK - I finally got a hold of a PCMCIA device....
I can alot of values using the following :

You can call it like:
WMI_Helper.GetDeviceIDs ids = new WMI_Helper.GetDeviceIDs();
            foreach ( string str in ids.DeviceID( "PCMCIA" ) )
            {
                Console.WriteLine( str );
            }

using System;
using System.Management;
using System.Windows.Forms;
using System.Collections.Generic;
 
namespace WMI_Helper
{
    public class GetDeviceIDs
    {
        public List<  string > DeviceID( string Contains )
        {
            List<string> list = new List<string>();
            try
            {
                ManagementObjectSearcher searcher = new ManagementObjectSearcher( "root\\CIMV2" , "SELECT * FROM Win32_SerialPort" );
 
                foreach ( ManagementObject queryObj in searcher.Get() )
                {
                    string s = String.Format( "PNPDeviceID: {0}" , queryObj[ "PNPDeviceID" ] );
                    if ( s.Contains( Contains ) )
                        list.Add( s );
                }
 
                return list;
            }
            catch ( ManagementException e )
            {
                MessageBox.Show( "An error occurred while querying for WMI data: " + e.Message );
            }
 
            return list;
        }
    }
}

Open in new window

0
 
WilliamCommented:
First are you using the 1.1 or 2.0 or??  framework?

Second, the easiest way to get all the valid ports is (in 2.0)

string[] theSerialPortNames = System.IO.Ports.SerialPort.GetPortNames();

this is c# so vb(ish I think)
Dim theSerialPortNames As String() = System.IO.Ports.SerialPort.GetPortNames()

You can alos get the registry data for all available com ports in the
'HKLM\Hardware\DeviceMap\SerialComm' reg path...
0
 
yaminihariAuthor Commented:
Hi BillyDvD,
   Thanks for the reply , i guess i need to get the device Id associated with the com port. I am using .net framework 2.0.
0
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
yaminihariAuthor Commented:
is there a way to get the DEVICE ID associated with each COM ports in vb.net?
0
 
WilliamCommented:
I am curious as to why you NEED the device id, NO TWO COM PORTS can have the same name so.... ????
0
 
yaminihariAuthor Commented:
Hi BillyDVD,
I have a device inserted into a com port and I need to find out which com port it is present. So what I do is get the device id and compare it with the device ids of all the devices in the com port. This is the scenario. Many thanks
0
 
WilliamCommented:
DO you have multiple devices attactched to ONE com port?
0
 
WilliamCommented:
BTW: When you use WMI to retrieve the 'DEVICE ID' of a serial port...  It returns the serial port name (EX: COM3)....
strComputer = "." 
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_SerialPort",,48) 
For Each objItem in colItems 
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_SerialPort instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "DeviceID: " & objItem.DeviceID
Next

Open in new window

0
 
yaminihariAuthor Commented:
Hi BillyDvd, first of all many thanks for your reply.
I dont have multiple devices. It is a pcmcia card which i insert into the slot. I need to get the device id of the card or I need to get the com port to which the card is attached to. I have used Win32_pcmciacontroller class but it gives the device id of the pcmcia bus controller and not the card. I assume even the Win32_serialport class will return the device id of the com port and not the device attached to the com port. Thanks once again for your input.  
0
 
WilliamCommented:
OK - Maybe this will help in the ID(ish) you are looking for...

This returns on mine:
PNPDeviceID: HDAUDIO\FUNC_02&VEN_14F1&DEV_2BFA&SUBSYS_103C309F&REV_0900\4&4B994D5&0&0102
strComputer = "." 
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\CIMV2") 
Set colItems = objWMIService.ExecQuery( _
    "SELECT * FROM Win32_SerialPort WHERE PNPDeviceID = 'HDAUDIO\\FUNC_02&VEN_14F1&DEV_2BFA&SUBSYS_103C309F&REV_0900\\4&4B994D5&0&0102'",,48) 
For Each objItem in colItems 
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "Win32_SerialPort instance"
    Wscript.Echo "-----------------------------------"
    Wscript.Echo "PNPDeviceID: " & objItem.PNPDeviceID
Next

Open in new window

0
 
yaminihariAuthor Commented:
Hi Billy,
I tried it but it doesnt work becoz PNPDeviceID from Win32_SerialPort gives the device id of the bus controller.I need to get the device id of the pcmcia card. That's my main task now. All the information available is giving me the device id of the pcmcia controller bus and not the card itself.
0
 
WilliamCommented:
DO you know what driver loads the card?
0
 
WilliamCommented:
I do not have any pcmcia cards loaded in my machine (I do have a slot).....
So I am only stabbing at this .....
using System;
using System.Management;
using System.Windows.Forms;
 
namespace WMISample
{
    public class MyWMIQuery
    {
        public static void Main()
        {
            try
            {
                ManagementObjectSearcher searcher = 
                    new ManagementObjectSearcher("root\\CIMV2", 
                    "SELECT * FROM Win32_PnPEntity"); 
 
                foreach (ManagementObject queryObj in searcher.Get())
                {
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("Win32_PnPEntity instance");
                    Console.WriteLine("-----------------------------------");
                    Console.WriteLine("DeviceID: {0}", queryObj["DeviceID"]);
                }
            }
            catch (ManagementException e)
            {
                MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
            }
        }
    }
}

Open in new window

0
 
yaminihariAuthor Commented:
hi billy,
sorry it doesnt work. but i have a pointer, pcmcia_socket_information structure which returns the port number of the pcmcia. any idea about it?
0
 
yaminihariAuthor Commented:
Hi Billy,
Sorry for the late response, this still will return the device id of the serial port and not the pcmcia card. I found another way round. I opened the registry and I read the com port value for the pcmcia card.  I am going to award the points for you for the effort you have taken with this issue and am sure this will be so useful for beginners like me. Many thanks, A+ for effort.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.