大家帮看看为什么DeviceIoControl访问OID_802_11_BSSID_LIST老是失败

如题，下面一段程序中，DeviceIoControl访问OID_802_11_BSSID_LIST老是失败，也就是说bResult一直等于0；为什么？请教牛人！！！
可能的问题出现在哪？为什么第二个DeviceIoControl失败？#include "stdafx.h"#include <windows.h>  #include <winioctl.h>  #include <string.h>  #include <stdio.h>  #include <IPHlpApi.h>  #include <IPTypes.h>  #include <ntddndis.h>#define NUMBEROF_BSSIDS 10  int main(){HANDLE hDev;bool bResult;DWORD junk;unsigned char macadress[32];  NDIS_802_11_BSSID_LIST* m_pBSSIDList;   m_pBSSIDList = ( NDIS_802_11_BSSID_LIST *) VirtualAlloc( NULL,  sizeof( NDIS_802_11_BSSID_LIST)* NUMBEROF_BSSIDS,  MEM_RESERVE | MEM_COMMIT,  PAGE_READWRITE) ;hDev=CreateFile(L"//./{FC1F5ED6-543B-404D-9051-FF85FC7D8161}",GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);if (hDev == INVALID_HANDLE_VALUE){return (FALSE);}else{  memset( m_pBSSIDList, 0, sizeof( NDIS_802_11_BSSID_LIST)* NUMBEROF_BSSIDS);ULONG oidcode = OID_802_11_BSSID_LIST_SCAN ; //0x0D01011A=218169626DeviceIoControl(hDev,IOCTL_NDIS_QUERY_GLOBAL_STATS,(LPVOID)&oidcode,sizeof(oidcode),(ULONG *)NULL,0,&junk,0);  Sleep(2000);memset( m_pBSSIDList, 0, sizeof( NDIS_802_11_BSSID_LIST)* NUMBEROF_BSSIDS);  oidcode = OID_802_11_BSSID_LIST; //0x0D010217=218169879bResult= DeviceIoControl(hDev,              。。。。。。。。。。。。。就是这个DeviceIoControl失败！IOCTL_NDIS_QUERY_GLOBAL_STATS,&oidcode,sizeof( oidcode),( ULONG *) m_pBSSIDList,sizeof( NDIS_802_11_BSSID_LIST)* NUMBEROF_BSSIDS,&junk,NULL);if (bResult){for (int i=0;i<m_pBSSIDList->NumberOfItems;i++){int temp=i;PNDIS_WLAN_BSSID cpSsid=m_pBSSIDList->Bssid;while(temp!=0){cpSsid=(PNDIS_WLAN_BSSID)((char *)cpSsid +cpSsid->Length);temp--;}printf("%f",cpSsid->Ssid.Ssid);printf("%d",cpSsid->Rssi);printf((char*)macadress,"%02X-%02X-%02X-%02X-%02X-%02X",(int*)m_pBSSIDList->Bssid.MacAddress[0],(int*)m_pBSSIDList->Bssid.MacAddress[1],(int*)m_pBSSIDList->Bssid.MacAddress[2],(int*)m_pBSSIDList->Bssid.MacAddress[3],(int*)m_pBSSIDList->Bssid.MacAddress[4],(int*)m_pBSSIDList->Bssid.MacAddress[5]);}}printf("failed");  CloseHandle(hDev);  getchar();}}

现在获得了DeviceIOcontrol的GetLastError返回值为31，  
〖31〗-连到系统上的设备没有发挥作用。  

是什么意思？如何解决？  
我的网卡应该是好的。我还用它上网呢