求助一个kernel32.dll控制键盘问题

抱歉用的是csharp，但感觉这个吧可能对这个问题接触多一点就来这问了。
想控制笔记本键盘上capslock键盘灯的开关，目前参照这个让USB键盘的LED灯听你的！（不干扰使用） - 叱咤小虾米 - 博客园 (cnblogs.com)但是我不知道IntPtr hKeyboard = CreateFile(@"\\.\Device\00000088", GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);这行createfile第一个参数怎么填，我device manager的keyboard里面有四个键盘，三个HID一个PS/2。求教应该填什么进去？
namespace KeybdLightCtrl
{
internal class StatusChange
{
[DllImport("kernel32.dll")]
static extern IntPtr CreateFile(string lpFileName, uint dwDesiredAccess,
uint dwShareMode, IntPtr lpSecurityAttributes, uint dwCreationDisposition,
uint dwFlagsAndAttributes, IntPtr hTemplateFile);
[DllImport("kernel32.dll")]
static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode,
IntPtr lpInBuffer, uint nInBufferSize,
IntPtr lpOutBuffer, uint nOutBufferSize,
out uint lpBytesReturned, IntPtr lpOverlapped);
private const uint GENERIC_WRITE = 0x40000000;
private const uint OPEN_EXISTING = 3;
private const uint FILE_ANY_ACCESS = 0;
private const uint METHOD_BUFFERED = 0;
private const uint FILE_DEVICE_KEYBOARD = 0x0000000b;
private uint IOCTL_KEYBOARD_SET_INDICATORS = CTL_CODE(FILE_DEVICE_KEYBOARD, 0x0002, METHOD_BUFFERED, FILE_ANY_ACCESS);
private uint IOCTL_KEYBOARD_QUERY_TYPEMATIC = CTL_CODE(FILE_DEVICE_KEYBOARD, 0x0008, METHOD_BUFFERED, FILE_ANY_ACCESS);
private uint IOCTL_KEYBOARD_QUERY_INDICATORS = CTL_CODE(FILE_DEVICE_KEYBOARD, 0x0010, METHOD_BUFFERED, FILE_ANY_ACCESS);
static uint CTL_CODE(uint DeviceType, uint Function, uint Method, uint Access)
{
return ((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method);
}
public void change()
{
IntPtr hKeyboard = CreateFile(@"\\.\Device\00000088", GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);
if (hKeyboard == IntPtr.Zero || hKeyboard.ToInt32() == -1)
{
MessageBox.Show("failed to open keybd device");
return;
}
//用marshal分配一块空内存（pbuffer）
KeyboardIndicatorParameters buffer = new KeyboardIndicatorParameters();
buffer.UnitId = 0;
buffer.LedFlags = Locks.None;
IntPtr pbuffer = Marshal.AllocHGlobal(Marshal.SizeOf(buffer));
uint retlen;
DeviceIoControl(hKeyboard, IOCTL_KEYBOARD_QUERY_INDICATORS, IntPtr.Zero, 0, pbuffer, (uint)Marshal.SizeOf(buffer), out retlen, IntPtr.Zero);
//解析pbuffer，转换capslock灯状态
KeyboardIndicatorParameters updatedBuffer = Marshal.PtrToStructure<KeyboardIndicatorParameters>(pbuffer);
Locks mask = Locks.KeyboardCapsLockOn;
updatedBuffer.LedFlags = updatedBuffer.LedFlags ^ mask;
Marshal.StructureToPtr(updatedBuffer, pbuffer, false);
//设置新状态
bool success = DeviceIoControl(hKeyboard, IOCTL_KEYBOARD_SET_INDICATORS, pbuffer, (uint)Marshal.SizeOf(buffer), IntPtr.Zero, 0, out retlen, IntPtr.Zero);
if (!success)
{
MessageBox.Show("failed");
return;
}
return;
}
struct KeyboardIndicatorParameters
{
public ushort UnitId;
public Locks LedFlags;
}
[Flags]
public enum Locks : ushort
{
None = 0,
KeyboardScrollLockOn = 1,
KeyboardNumLockOn = 2,
KeyboardCapsLockOn = 4
}
}
}