Wow, great reply NetWallah! I've been chewing through information links since last night. The google group pointer was interesting reading, but I wasn't able to apply anything they said to get things working (there was a lot I didn't understand though).

On the plus side, I was able to track down some stuff yesterday afternoon. After my original posting, I was thinking that the hardcoded use of IOCTL_NDIS_QUERY_GLOBAL_STATS may be the problem. I ran across some other possibilities that could be used, here:

//
// NtDeviceIoControlFile IoControlCode values for this device.
//
// Warning: Remember that the low two bits of the code specify how the
//          buffers are passed to the driver!
//

#define _NDIS_CONTROL_CODE(request,method) \
            CTL_CODE(FILE_DEVICE_PHYSICAL_NETCARD, request, method, FI
+LE_ANY_ACCESS)

#define IOCTL_NDIS_QUERY_GLOBAL_STATS   _NDIS_CONTROL_CODE(0, METHOD_O
+UT_DIRECT)
#define IOCTL_NDIS_QUERY_ALL_STATS      _NDIS_CONTROL_CODE(1, METHOD_O
+UT_DIRECT)
#define IOCTL_NDIS_DO_PNP_OPERATION     _NDIS_CONTROL_CODE(2, METHOD_B
+UFFERED)
#define IOCTL_NDIS_QUERY_SELECTED_STATS _NDIS_CONTROL_CODE(3, METHOD_O
+UT_DIRECT)
#define IOCTL_NDIS_ENUMERATE_INTERFACES _NDIS_CONTROL_CODE(4, METHOD_B
+UFFERED)
#define IOCTL_NDIS_ADD_TDI_DEVICE       _NDIS_CONTROL_CODE(5, METHOD_B
+UFFERED)
#define IOCTL_NDIS_GET_LOG_DATA         _NDIS_CONTROL_CODE(7, METHOD_O
+UT_DIRECT)
#define IOCTL_NDIS_GET_VERSION          _NDIS_CONTROL_CODE(8, METHOD_O
+UT_DIRECT)
[download]

I couldn't make much sense of the CTL_CODE macro, but found documentation on it here, and found a freeBSD implementation of it at this link:

#define CTL_CODE(devType, func, meth, acc) (((devType) << 16) | ((acc)
+ << 14) | ((func) << 2) | (meth))
[download]

Using any of these didn't help me any towards a solution (although you may have to deal with the METHOD_BUFFERED differently), and that's as far as I've gotten so far.

Also, thanks for the DBD::WMI code! Alas, I'm constrained to only using modules distributed via activestate, and this isn't one of them. I actually asked for some help on solving this issue last November, but got nowhere.

Any other thoughts, or pointers are welcome!

-Craig