USB devices and WMI

L Tiger

Hi,

i´ve a problem with usb devices and WMI. I´m writing a program (c#) to identify usb devices. Now i´ve to know the drive letter, the usb interal serial number (not the one, which Windows creates) and the VID/PID of the device. With WMI i´m able to read the drive letter and the internal serial number of all connected devices. But i can´t read the drive letter and the serial number only of the device i´ve connected at this moment.

Does anybody know, how to read out the three properties of a just connected usb device?

P.S.: I hope, this is the right forum to ask...

3 Replies

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L Tiger17y ago
Hi,

now i´ve the code to determine the Signature, the VolumeSerialNumber and the drive letter of a connected usb device (WMI classes UsbControllerDevice, DiskDrive and LogicalDisk). But now i´ve to know the VID/PID or the usb classes (HID, Biometrics,...) of the device. Does anybody know how to figure out the VID/PID or the usb classes out of the known properties (signature, volumeserialnumber, drive letter)?
L Tiger17y ago
Hi,

i´ve tested the code with ten usb devices. But no SerialNumber was displayed at every device and the PID/VID isn´t there, too :(

EDIT:
Ok, i found out, that the SerialNumber is not available in Windows XP and earlier.
Instead of the SerialNumber the Signature will be a better option for XP and later. I´ll post the code, when i´ve tested it...

Roei Bar17y ago

here you go :

 / browse all USB WMI physical disks

foreach(ManagementObject drive in new ManagementObjectSearcher(
    "select * from Win32_DiskDrive where InterfaceType='USB'").Get())
{
    // associate physical disks with partitions

    foreach(ManagementObject partition in new ManagementObjectSearcher(
        "ASSOCIATORS OF {Win32_DiskDrive.DeviceID='" + drive["DeviceID"]
          + "'} WHERE AssocClass = 
                Win32_DiskDriveToDiskPartition").Get())
    {
        Console.WriteLine("Partition=" + partition["Name"]);

        // associate partitions with logical disks (drive letter volumes)

        foreach(ManagementObject disk in new ManagementObjectSearcher(
            "ASSOCIATORS OF {Win32_DiskPartition.DeviceID='"
              + partition["DeviceID"]
              + "'} WHERE AssocClass =
                Win32_LogicalDiskToPartition").Get())
        {
            Console.WriteLine("Disk=" + disk["Name"]);
        }
    }

    // this may display nothing if the physical disk

    // does not have a hardware serial number

    Console.WriteLine("Serial="
     + new ManagementObject("Win32_PhysicalMedia.Tag='"
     + drive["DeviceID"] + "'")["SerialNumber"]);
}

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