I was working with some hardware (Smart card reader), which needs
to interact with my C# code. When I was starting, I was really a fresher in
this area. My objective is to detect the device attached in my pc. If it is
attached an event will fire, and same will happen on the remove. To do that, I
created a windows service. But now the challenge is device detection on my pc.
To do that, I have to get the details from hardware manager
of my pc. I got the solution from c# itself.
using System.Management;
It will help to get hardware information from pc using c#
code. The code is as follows-
static bool getDeviceFromHWM(string deviceGuid)
{
ManagementObjectSearcher mos =
new ManagementObjectSearcher(@"\root\cimv2", @"Select
* From Win32_PnPEntity WHERE ClassGuid = '"+deviceGuid+"'");
ManagementObjectCollection moc = mos.Get();
foreach (ManagementObject
mo in moc)
{
PropertyDataCollection devsProperties
= mo.Properties;
foreach (PropertyData
devProperty in devsProperties)
{
if (devProperty.Type == CimType.DateTime)
{
if (devProperty.Value != null)
{
}
}
else
{
Console.WriteLine(" {0}----->{1}",devProperty.Name,
devProperty.Value);
}
}
}
if (moc.Count > 0)
return true;
else
return false;
}
Now, function receives
one input “deviceGUID”. It is nothing but the device type id, common for
windows. So , to find a smart card reader and smart card from my pc I have to
use a GUID -{990a2bd7-e738-46c7-b26f-1cf8fb9f1391}
and {50DD5230-BA8A-11D1-BF5D-0000F805F530}.
Basic Class GUID table
|
Class
|
GUID
|
Device Description
|
|
CDROM
|
4D36E965-E325-11CE-BFC1-08002BE10318
|
CD/DVD/Blu-ray drives
|
|
DiskDrive
|
4D36E967-E325-11CE-BFC1-08002BE10318
|
Hard drives
|
|
Display
|
4D36E968-E325-11CE-BFC1-08002BE10318
|
Video adapters
|
|
FDC
|
4D36E969-E325-11CE-BFC1-08002BE10318
|
Floppy controllers
|
|
FloppyDisk
|
4D36E980-E325-11CE-BFC1-08002BE10318
|
Floppy drives
|
|
HDC
|
4D36E96A-E325-11CE-BFC1-08002BE10318
|
Hard drive controllers
|
|
HIDClass
|
745A17A0-74D3-11D0-B6FE-00A0C90F57DA
|
Some USB devices
|
|
1394
|
6BDD1FC1-810F-11D0-BEC7-08002BE2092F
|
IEEE 1394 host controller
|
|
Image
|
6BDD1FC6-810F-11D0-BEC7-08002BE2092F
|
Cameras and scanners
|
|
Keyboard
|
4D36E96B-E325-11CE-BFC1-08002BE10318
|
Keyboards
|
|
Modem
|
4D36E96D-E325-11CE-BFC1-08002BE10318
|
Modems
|
|
Mouse
|
4D36E96F-E325-11CE-BFC1-08002BE10318
|
Mice and pointing devices
|
|
Media
|
4D36E96C-E325-11CE-BFC1-08002BE10318
|
Audio and video devices
|
|
Net
|
4D36E972-E325-11CE-BFC1-08002BE10318
|
Network adapters
|
|
Ports
|
4D36E978-E325-11CE-BFC1-08002BE10318
|
Serial and parallel ports
|
|
SCSIAdapter
|
4D36E97B-E325-11CE-BFC1-08002BE10318
|
SCSI and RAID controllers
|
|
System
|
4D36E97D-E325-11CE-BFC1-08002BE10318
|
System buses, bridges, etc.
|
|
USB
|
36FC9E60-C465-11CF-8056-444553540000
|
USB host controllers and hubs
|
Now, there is a problem, if we remove and add device very
quickly. It will not update the status in system table. So, after removing a
device from PC, it shows, device is still attached. To overcome the problem, I
used following code-
public static class Win32Api
{
public const int CM_LOCATE_DEVNODE_NORMAL = 0x00000000;
public const int CM_REENUMERATE_NORMAL = 0x00000000;
public const int CR_SUCCESS = 0x00000000;
[DllImport("CfgMgr32.dll",
SetLastError = true)]
public static extern int
CM_Locate_DevNodeA(ref int
pdnDevInst, string pDeviceID, int ulFlags);
[DllImport("CfgMgr32.dll",
SetLastError = true)]
public static extern int
CM_Reenumerate_DevNode(int dnDevInst, int ulFlags);
}
And use it just at the beginning of your code-
int pdnDevInst = 0;
if (Win32Api.CM_Locate_DevNodeA(ref pdnDevInst, null,
Win32Api.CM_LOCATE_DEVNODE_NORMAL) != Win32Api.CR_SUCCESS) { }
if (Win32Api.CM_Reenumerate_DevNode(pdnDevInst,
Win32Api.CM_REENUMERATE_NORMAL) != Win32Api.CR_SUCCESS) { }
Full code-
public static void Main()
{
int pdnDevInst = 0;
if (Win32Api.CM_Locate_DevNodeA(ref pdnDevInst, null,
Win32Api.CM_LOCATE_DEVNODE_NORMAL) != Win32Api.CR_SUCCESS) { }
if (Win32Api.CM_Reenumerate_DevNode(pdnDevInst,
Win32Api.CM_REENUMERATE_NORMAL) != Win32Api.CR_SUCCESS) { }
if (getDeviceFromHWM("{50DD5230-BA8A-11D1-BF5D-0000F805F530}"))
Console.WriteLine("Card reader is connected");
}
Further reference-
