Here is a WBem WMI C++ example

[Jimi]

As you know most of the WMI example/docs in the MSDN are geared toward
VB and ASP. Finding a good C++ example seems to be hard. After
taking our team a couple of days to figure out how to use this WMI
stuff, we've decided to post a complete working example in C++.
Hopefully this will save you some time.

void CWbemClientDlg::OnNetworkBtn()
{
IWbemLocator *pLocator = NULL;
IWbemServices *pNamespace = 0;
IWbemClassObject *pClass = NULL;
IWbemClassObject *pMethod = NULL;
IWbemClassObject *pInInst = NULL;
IWbemClassObject *pOutInst = NULL;

// Strings needed later
BSTR className = SysAllocString(L"Win32_NetworkAdapterConfiguration");
BSTR methodName = SysAllocString(L"EnableStatic");
BSTR namespacePath = SysAllocString(L"root\\cimv2");

// Create WbemLocator Instance
HRESULT hr;
hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLocator);

// Using the WbemLocator, connect to the namespace
hr = pLocator->ConnectServer(namespacePath, NULL, NULL, NULL, 0,
NULL, NULL, &pNamespace);

// Get the class object
hr = pNamespace->GetObject(className, 0, NULL, &pClass, NULL);

// Get the method we want to use in this class
hr = pClass->GetMethod(methodName, 0, &pMethod, NULL);

// Spawn an instance of the method so we can set it up (parameters)
hr = pMethod->SpawnInstance(0, &pInInst);

// EnableStatic() expects to receive the args in an array
BSTR ArgNameIP = SysAllocString(L"IPAddress");
BSTR ArgNameSM = SysAllocString(L"SubnetMask");
BSTR IP = SysAllocString(L"172.21.0.1");
BSTR SM = SysAllocString(L"255.255.0.0");

SAFEARRAYBOUND sab[1];
sab[0].cElements = 1;
sab[0].lLbound = 0;

LONG i = 0; // index needed for SafeArrayPutElement()

// var1 is the array that holds one element which is IP
VARIANT var1;
var1.vt = VT_ARRAY | VT_BSTR;
var1.parray = SafeArrayCreate(VT_BSTR, 1, sab); // create the
array
SafeArrayPutElement(var1.parray, &i, IP); // put IP in the array
at pos 0

// var2 is the array that holds one element which is SM
VARIANT var2;
var2.vt = VT_ARRAY | VT_BSTR;
var2.parray = SafeArrayCreate(VT_BSTR, 1, sab); // create the
array
SafeArrayPutElement(var2.parray, &i, SM); // put SM in the array
at pos 0

// put the ArgName and the Argument itself into the Method instance
we have
hr = pInInst->Put(ArgNameIP, 0, &var1, 0);
VariantClear(&var1);
hr = pInInst->Put(ArgNameSM, 0, &var2, 0);
VariantClear(&var2);

// Enumerate the instances of the NetworkAdapter to get at the __PATH
property
// to the one and only network card we really want to modify
IEnumWbemClassObject* pEnum;
hr = pNamespace->CreateInstanceEnum(className,
WBEM_FLAG_RETURN_IMMEDIATELY | WBEM_FLAG_FORWARD_ONLY,
NULL, &pEnum);

// Get the instance
ULONG numRet;
BSTR PropName;
VARIANT desc;
VARIANT dhcp;
VARIANT pathVar;
IWbemClassObject *pInstance;
while ( hr != WBEM_S_FALSE)
{
hr = pEnum->Next(WBEM_INFINITE, (ULONG)1, &pInstance, &numRet);

// we know that the one with DHCP is the one we want
PropName = SysAllocString(L"DHCPEnabled");
pInstance->Get(PropName, 0, &dhcp, 0, 0);
if (dhcp.bVal)
{
// Print out the description just for us to see
SysFreeString(PropName);
PropName = SysAllocString(L"Description");
pInstance->Get(PropName, 0, &desc, 0, 0);
CString message = desc.bstrVal;
MessageBox(message);
SysFreeString(PropName);
break;
}
SysFreeString(PropName);
}

// now we have the instance of the actual network card we want to
modify
// let's query it's PATH property so that we can call the method on
it.
PropName = SysAllocString(L"__PATH");
pInstance->Get(PropName, 0, &pathVar, 0, 0);
BSTR InstancePath = pathVar.bstrVal;

// finally we get to call the actuall method we want (EnableStatic())
hr = pNamespace->ExecMethod(InstancePath, methodName, 0, NULL,
pInInst, &pOutInst, NULL);
if(hr != WBEM_S_NO_ERROR)
{
BSTR Text;
hr = pOutInst->GetObjectText(0, &Text);
CString strText = Text;
MessageBox(strText);
}

// We're done!
// Free up resources
SysFreeString(className);
SysFreeString(methodName);
SysFreeString(namespacePath);
SysFreeString(ArgNameIP);
SysFreeString(ArgNameSM);
SysFreeString(IP);
SysFreeString(SM);
SysFreeString(PropName);
SysFreeString(InstancePath);
pLocator->Release();
pClass->Release();
pMethod->Release();
pNamespace->Release();
pInInst->Release();
pOutInst->Release();
pEnum->Release();
pInstance->Release();
CoUninitialize();
}

[Eric Sassaman [MS]]

Please note that Microsoft is not monitoring this newsgroup any
longer. This newsgroup may be deleted at a future date.

We highly recommend you post to microsoft.public.win32.programmer.wmi
as the best place to discuss any WMI programming issues. MSDN managed
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_____________
Eric Sassaman
Microsoft Support
This posting is provided "AS IS" with no warranties, and confers no rights.

"Jimi" <Jimi....@GambroBCT.com> wrote in message
news:88c4053e.02041...@posting.google.com...

[Schorschi Decker]

Does anyone have a straight-C example? I have worked a quirky version in
that the specific WMI code is compiled with the C++ compiler not the C
compiler in VS C .NET, but this is not a clean solution.

"Jimi" <Jimi....@GambroBCT.com> wrote in message
news:88c4053e.02041...@posting.google.com...