VC++ security problem using WMI

Hi,
I found some code from codeproject site using WMI in VC++.

I have created a method having the following code in it. It works fine when
I am running into "Admin" accound in Windows XP Pro while in "Restricted
user account", its not able to run. It's giving error messsage "Could not
enumerate" so it seems "pEnumObject" seems null or empty.
Please help,

Thanks in advance,

Code:
CoInitialize(NULL);
//Security needs to be initialized in XP first and this was the major
problem
//why it was not working in XP.
if(CoInitializeSecurity( NULL,
-1,

NULL,

NULL,

RPC_C_AUTHN_LEVEL_PKT,

RPC_C_IMP_LEVEL_IMPERSONATE,

NULL,

EOAC_NONE,

0

) != S_OK)

return;


IWbemLocator * pIWbemLocator = NULL;

IWbemServices * pWbemServices = NULL;

IEnumWbemClassObject * pEnumObject = NULL;

BSTR bstrNamespace = (L"root\\cimv2");



if(CoCreateInstance (

CLSID_WbemAdministrativeLocator,

NULL ,

CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER ,

IID_IUnknown ,

( void ** ) & pIWbemLocator

) != S_OK)

return;

if(pIWbemLocator->ConnectServer(

bstrNamespace, // Namespace

NULL, // Userid

NULL, // PW

NULL, // Locale

0, // flags

NULL, // Authority

NULL, // Context

&pWbemServices

) != S_OK)

return;




HRESULT hRes;

// BSTR strQuery = (L"Select * from Win32_PhysicalMedia");

BSTR strQuery = (L"Select * from Win32_PhysicalMedia");

BSTR strQL = (L"WQL");

hRes = pWbemServices->ExecQuery(strQL,
strQuery,WBEM_FLAG_RETURN_IMMEDIATELY,NULL,&pEnumObject);


if(hRes != S_OK)

{

MessageBox("Could not execute Query");

return;

}

ULONG uCount = 1, uReturned;

IWbemClassObject * pClassObject = NULL;



hRes = pEnumObject->Reset();

if(hRes != S_OK)

{

MessageBox("Could not Enumerate");

return;

}

hRes = pEnumObject->Next(WBEM_INFINITE,uCount, &pClassObject, &uReturned);

if(hRes != S_OK)

{

MessageBox("Could not Enumerate");

return;

}

VARIANT v;

//BSTR strClassProp = SysAllocString(L"SerialNumber");

//Product

BSTR strClassProp = SysAllocString(L"SerialNumber");

hRes = pClassObject->Get(strClassProp, 0, &v, 0, 0);

if(hRes != S_OK)

{

MessageBox("Could not Get Value");

return;

}

SysFreeString(strClassProp);


_bstr_t bstrPath = &v; //Just to convert BSTR to ANSI

char* strPath=(char*)bstrPath;



if (SUCCEEDED(hRes))

{

VariantClear( &v );

pIWbemLocator->Release();

pWbemServices->Release();

pEnumObject->Release();

pClassObject->Release();

CoUninitialize();

return strPath;

}

else

{

MessageBox("Error in getting object");

return;

}

VariantClear( &v );

pIWbemLocator->Release();

pWbemServices->Release();

pEnumObject->Release();

pClassObject->Release();

CoUninitialize();

return;

Hi,

In general, all calls related to "physical" devices require Admin rights
on Windows. You can usually get "logical" devices as a normal user but
not physical.

Newsgroups wrote:
> Hi,
> I found some code from codeproject site using WMI in VC++.
>
> I have created a method having the following code in it. It works fine when
> I am running into "Admin" accound in Windows XP Pro while in "Restricted
> user account", its not able to run. It's giving error messsage "Could not
> enumerate" so it seems "pEnumObject" seems null or empty.
> Please help,
>
> Thanks in advance,
>
> Code:
> CoInitialize(NULL);
> //Security needs to be initialized in XP first and this was the major
> problem
> //why it was not working in XP.
> if(CoInitializeSecurity( NULL,
> -1,
>
> NULL,
>
> NULL,
>
> RPC_C_AUTHN_LEVEL_PKT,
>
> RPC_C_IMP_LEVEL_IMPERSONATE,
>
> NULL,
>
> EOAC_NONE,
>
> 0
>
> ) != S_OK)
>
> return;
>
>
> IWbemLocator * pIWbemLocator = NULL;
>
> IWbemServices * pWbemServices = NULL;
>
> IEnumWbemClassObject * pEnumObject = NULL;
>
> BSTR bstrNamespace = (L"root\\cimv2");
>
>
>
> if(CoCreateInstance (
>
> CLSID_WbemAdministrativeLocator,
>
> NULL ,
>
> CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER ,
>
> IID_IUnknown ,
>
> ( void ** ) & pIWbemLocator
>
> ) != S_OK)
>
> return;
>
> if(pIWbemLocator->ConnectServer(
>
> bstrNamespace, // Namespace
>
> NULL, // Userid
>
> NULL, // PW
>
> NULL, // Locale
>
> 0, // flags
>
> NULL, // Authority
>
> NULL, // Context
>
> &pWbemServices
>
> ) != S_OK)
>
> return;
>
>
>
>
> HRESULT hRes;
>
> // BSTR strQuery = (L"Select * from Win32_PhysicalMedia");
>
> BSTR strQuery = (L"Select * from Win32_PhysicalMedia");
>
> BSTR strQL = (L"WQL");
>
> hRes = pWbemServices->ExecQuery(strQL,
> strQuery,WBEM_FLAG_RETURN_IMMEDIATELY,NULL,&pEnumObject);
>
>
> if(hRes != S_OK)
>
> {
>
> MessageBox("Could not execute Query");
>
> return;
>
> }
>
> ULONG uCount = 1, uReturned;
>
> IWbemClassObject * pClassObject = NULL;
>
>
>
> hRes = pEnumObject->Reset();
>
> if(hRes != S_OK)
>
> {
>
> MessageBox("Could not Enumerate");
>
> return;
>
> }
>
> hRes = pEnumObject->Next(WBEM_INFINITE,uCount, &pClassObject, &uReturned);
>
> if(hRes != S_OK)
>
> {
>
> MessageBox("Could not Enumerate");
>
> return;
>
> }
>
> VARIANT v;
>
> //BSTR strClassProp = SysAllocString(L"SerialNumber");
>
> //Product
>
> BSTR strClassProp = SysAllocString(L"SerialNumber");
>
> hRes = pClassObject->Get(strClassProp, 0, &v, 0, 0);
>
> if(hRes != S_OK)
>
> {
>
> MessageBox("Could not Get Value");
>
> return;
>
> }
>
> SysFreeString(strClassProp);
>
>
> _bstr_t bstrPath = &v; //Just to convert BSTR to ANSI
>
> char* strPath=(char*)bstrPath;
>
>
>
> if (SUCCEEDED(hRes))
>
> {
>
> VariantClear( &v );
>
> pIWbemLocator->Release();
>
> pWbemServices->Release();
>
> pEnumObject->Release();
>
> pClassObject->Release();
>
> CoUninitialize();
>
> return strPath;
>
> }
>
> else
>
> {
>
> MessageBox("Error in getting object");
>
> return;
>
> }
>
> VariantClear( &v );
>
> pIWbemLocator->Release();
>
> pWbemServices->Release();
>
> pEnumObject->Release();
>
> pClassObject->Release();
>
> CoUninitialize();
>
> return;
>
>
>
>
>


--
Gerry Hickman (London UK)