获取PPC设备的ID号

using System.Collections;
using System.Runtime.InteropServices;

 [DllImport("coredll.dll")]
        private static extern bool KernelIoControl(Int32 IoControlCode, IntPtr
            InputBuffer, Int32 InputBufferSize, byte[] OutputBuffer, Int32
            OutputBufferSize, ref Int32 BytesReturned);

        private static Int32 FILE_DEVICE_HAL = 0x00000101;
        private static Int32 FILE_ANY_ACCESS = 0x0;
        private static Int32 METHOD_BUFFERED = 0x0;

        private static Int32 IOCTL_HAL_GET_DEVICEID =
            ((FILE_DEVICE_HAL) << 16) | ((FILE_ANY_ACCESS) << 14)
            | ((21) << 2) | (METHOD_BUFFERED);
        private static string GetDeviceID()
        {
            byte[] OutputBuffer = new byte[256];
            Int32 OutputBufferSize, BytesReturned;
            OutputBufferSize = OutputBuffer.Length;
            BytesReturned = 0;

            // Call KernelIoControl passing the previously defined
            // IOCTL_HAL_GET_DEVICEID parameter
            // We don?’t need to pass any input buffers to this call
            // so InputBuffer and InputBufferSize are set to their null
            // values
            bool retVal = KernelIoControl(IOCTL_HAL_GET_DEVICEID,
                IntPtr.Zero,
                0,
                     OutputBuffer,
                                     OutputBufferSize,
                                                         ref BytesReturned);

            // If the request failed, exit the method now
            if (retVal == false)
            {
                return null;
            }

            // Examine the OutputBuffer byte array to find the start of the
            // Preset ID and Platform ID, as well as the size of the
            // PlatformID.
            // PresetIDOffset -The number of bytes the preset ID is offset
            //                  from the beginning of the structure
            // PlatformIDOffset - The number of bytes the platform ID is
            //                    offset from the beginning of the structure
            // PlatformIDSize - The number of bytes used to store the
            //                  platform ID
            // Use BitConverter.ToInt32() to convert from byte[] to int
            Int32 PresetIDOffset = BitConverter.ToInt32(OutputBuffer, 4);
            Int32 PlatformIDOffset = BitConverter.ToInt32(OutputBuffer, 0xc);
            Int32 PlatformIDSize = BitConverter.ToInt32(OutputBuffer, 0x10);

            // Convert the Preset ID segments into a string so they can be
            // displayed easily.
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            sb.Append(String.Format("{0:X8}-{1:X4}-{2:X4}-{3:X4}-",
                BitConverter.ToInt32(OutputBuffer, PresetIDOffset),
                BitConverter.ToInt16(OutputBuffer, PresetIDOffset + 4),
                BitConverter.ToInt16(OutputBuffer, PresetIDOffset + 6),
                BitConverter.ToInt16(OutputBuffer, PresetIDOffset + 8)));

            // Break the Platform ID down into 2-digit hexadecimal numbers
            // and append them to the Preset ID. This will result in a
            // string-formatted Device ID
            for (int i = PlatformIDOffset;
                i < PlatformIDOffset + PlatformIDSize;
                i++)
            {
                sb.Append(String.Format("{0:X2}", OutputBuffer[i]));
            }

            // return the Device ID string
            return sb.ToString();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = GetDeviceID();
        }