vc++ hdd serial no no working

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VisualC++

// Mac Address.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdafx.h"
#include <windows.h>
#include <conio.h>
#include <string>
#include<iostream>
#include <fstream>
#include <lm.h>
#include <assert.h>
#include <winsock.h>
#define _WIN32_DCOM
#include <iostream>
#include <comdef.h>
#include <wbemidl.h>
#include <comutil.h>

#pragma comment(lib, "Netapi32.lib")
#pragma comment(lib, "wsock32.lib")
# pragma comment(lib, "wbemuuid.lib")

using namespace std;


void filewrite(string a,int e)
{
	ofstream fout;
	if(e==1)
	fout.open("System Configuration.txt");
	else
	{
		fout.open("System Configuration.txt", ios::app);
		fout<<a;
		fout<<endl;
	}
	
	
	fout.close();
	
}

void getmac()
{
	unsigned char MACData[8];
	WKSTA_TRANSPORT_INFO_0 *pwkti;
	DWORD dwEntriesRead;
	DWORD dwTotalEntries;
	BYTE *pbBuffer;

	NET_API_STATUS dwStatus = NetWkstaTransportEnum(
		NULL,						// [in]  server name
		0,							// [in]  data structure to return
		&pbBuffer,					// [out] pointer to buffer
		MAX_PREFERRED_LENGTH,		// [in]  maximum length
		&dwEntriesRead,				// [out] counter of elements actually enumerated
		&dwTotalEntries,			// [out] total number of elements that could be enumerated
		NULL);						// [in/out] resume handle

	assert(dwStatus == NERR_Success);

	pwkti = (WKSTA_TRANSPORT_INFO_0 *)pbBuffer;		// type cast the buffer

	for(DWORD i=1; i< dwEntriesRead; i++)			// first address is 00000000, skip it
	{	char dd[33];	
		// enumerate MACs and print
		swscanf((wchar_t *)pwkti[i].wkti0_transport_address, L"%2hx%2hx%2hx%2hx%2hx%2hx", 
			&MACData[0], &MACData[1], &MACData[2], &MACData[3], &MACData[4], &MACData[5]);
		//PrintMACaddress(MACData);
		sprintf(dd," %02x-%02x-%02x-%02x-%02x-%02x\n",MACData[0], MACData[1], MACData[2], MACData[3], MACData[4], MACData[5]);
		string u="MAC Address		:";
		u+=dd;
		filewrite(u,0);
	}
	
	// Release pbBuffer allocated by above function
	dwStatus = NetApiBufferFree(pbBuffer);
	assert(dwStatus == NERR_Success);
}

void getip()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	char name[255];
	PHOSTENT hostinfo;
	wVersionRequested = MAKEWORD( 1, 1 );
	char *ip;

	if ( WSAStartup( wVersionRequested, &wsaData ) == 0 )
		if( gethostname ( name, sizeof(name)) == 0)
		{
			//printf("Host name: %s\n", name);
			string name1="Computer Name: ";
			name1+=name;
			filewrite(name1,0);

			if((hostinfo = gethostbyname(name)) != NULL)
			{
				int nCount = 0;
				while(hostinfo->h_addr_list[nCount])
				{
					ip = inet_ntoa (*(struct in_addr *)hostinfo->h_addr_list[nCount]);
					++nCount;
					//printf("IP #%d: %s\n", ++nCount, ip);
					
					
					string s="IP Adress			: ";
					s+=ip;
					filewrite(s,0);
				}
			}
		}
}
void getsn_no()
{
	 CoInitializeEx(0, COINIT_MULTITHREADED);

	 CoInitializeSecurity(
        NULL, 
        -1,                          // COM authentication
        NULL,                        // Authentication services
        NULL,                        // Reserved
        RPC_C_AUTHN_LEVEL_DEFAULT,   // Default authentication 
        RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation  
        NULL,                        // Authentication info
        EOAC_NONE,                   // Additional capabilities 
        NULL                         // Reserved
        );

	  IWbemLocator *pLoc = NULL;

	  CoCreateInstance(
        CLSID_WbemLocator,             
        0, 
        CLSCTX_INPROC_SERVER, 
        IID_IWbemLocator, (LPVOID *) &pLoc);

	  IWbemServices *pSvc = NULL;
	   pLoc->ConnectServer(
         _bstr_t(L"ROOT\\CIMV2"), // Object path of WMI namespace
         NULL,                    // User name. NULL = current user
         NULL,                    // User password. NULL = current
         0,                       // Locale. NULL indicates current
         NULL,                    // Security flags.
         0,                       // Authority (e.g. Kerberos)
         0,                       // Context object 
         &pSvc                    // pointer to IWbemServices proxy
         );
	

		IEnumWbemClassObject* pEnumerator = NULL;
		ULONG uReturn;
		int i=1,x=0;
		LPCWSTR lp3;
		_bstr_t win32;
		string data;

while(i<=7)
{

	switch(i)
	{
	case 1:
		filewrite("MOTHER BOARD",0);
		win32="SELECT * FROM Win32_BaseBoard";
		lp3=L"SerialNumber";
		data="SerialNumber		:";
		break;
	case 2:
		win32="SELECT * FROM Win32_BaseBoard";
		lp3=L"Product";
		data="Product ID			:";
		break;
	case 3:
		win32="SELECT * FROM Win32_Processor";
		lp3=L"ProcessorId";
		data="Processor Id		:";
		x=1;
		cout<<"Configuring Software....."<<endl<<endl;
		break;
	case 4:
		 filewrite("",0);
		 filewrite("HARD-DISK & FLAS DRIVE",0);
		 win32="SELECT * FROM Win32_DiskDrive";
		 lp3=L"Model";
		 data="Model NO			: ";
		 break;
	case 5:
		 win32="SELECT * FROM Win32_DiskDrive";
		 lp3=L"InterfaceType";
		 data="InterfaceType		: ";
		 break;
	case 6:
		filewrite("",0);
		filewrite("LOCAL DISK's		SERIAL No.",0);
		win32="SELECT * FROM Win32_LogicalDisk";
		lp3=L"Name";
		x=3;
		break;
	case 7:
		filewrite("",0);
		win32="SELECT * FROM Win32_OperatingSystem";
		lp3=L"Name";
		filewrite("OS Name |PATH|  |PARTITION|",0);
		x=0;
		break;
	}
	i++;

	    pSvc->ExecQuery(
        bstr_t("WQL"), 
        bstr_t(win32),
        WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, 
        NULL,
        &pEnumerator);

		IWbemClassObject *pclsObj;
     uReturn = 0;
	//filewrite("HD&FLASH DRIVE's           ",0);
   
    while (pEnumerator)
    {
        HRESULT hr = pEnumerator->Next(WBEM_INFINITE, 1,&pclsObj, &uReturn);

        if(0 == uReturn)
        {
            break;
        }


		VARIANT vtProp;

        // Get the value of the Name property
			
		pclsObj->Get(lp3, 0, &vtProp, 0, 0);
		data+=(const char*)_bstr_t(vtProp.bstrVal);

		if(x==3)
		{
			lp3=L"VolumeSerialNumber";
			string n;
			n=data;
			n+="			";
			pclsObj->Get(lp3, 0, &vtProp, 0, 0);
			n+=(const char*)_bstr_t(vtProp.bstrVal);
			data=n;
			lp3=L"Name";
			
		}

		filewrite(data,0);
		
        VariantClear(&vtProp);
		pclsObj->Release();
		data.clear();
		if(x==1)
		{
			x=0;
			break;
		}
	}
}
	pSvc->Release();
    pLoc->Release();
    pEnumerator->Release();
    CoUninitialize();
}

int _tmain(int argc, _TCHAR* argv[])

{
	filewrite("",1);
	cout<<"Configuring Hardware....."<<endl;
	getip();
	getmac();
	getsn_no();
	cout<<endl<<"	Configuration Completed";
	cout<<endl<<endl<<endl<<"Press any key to continue...";
	getch();
	return 0;

}

every thing works fine, butt when i try to get HDD serial no by
win32_physicalmedia
get(L"serialNumber,0,&varient,0,0)
it returns NULL varinet... please help