获取PPC设备的ID号

[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();
}