Example: Creating a WMI Application
http://msdn.microsoft.com/library/en-us/wmisdk/wmi/example_creating_a_wmi_application.asp

Invoking a Synchronous Query
http://msdn.microsoft.com/library/en-us/wmisdk/wmi/invoking_a_synchronous_query.asp

// Gegen WbemUuid.Lib linken! 

#include <windows.h> 
#include <tchar.h> 
#include <wbemdisp.h> 
#include <cassert> 

HRESULT GetObjectProperty(ISWbemObject* pObject, LPCWSTR pwszPropertyName, VARIANT* pValue) 
{ 
    ISWbemPropertySet*  pPropSet    = NULL; 
    ISWbemProperty*     pProp       = NULL; 
    HRESULT             hr; 

    if(SUCCEEDED((hr = pObject->get_Properties_(&pPropSet)))) 
    { 
        BSTR bstrName = SysAllocString(pwszPropertyName); 

        if(SUCCEEDED((hr = pPropSet->Item(bstrName, 0, &pProp)))) 
        { 
            VariantInit(pValue); 
            hr = pProp->get_Value(pValue); 
            pProp->Release(); 
        } 

        SysFreeString(bstrName); 
        pPropSet->Release(); 
    } 

    return(hr); 
} 

HRESULT GetCaption(ISWbemObject* pObject, BSTR* pbstrCaption) 
{ 
    assert(!IsBadWritePtr(pbstrCaption, sizeof(*pbstrCaption))); 
    *pbstrCaption = NULL; 

    VARIANT var; 
    VariantInit(&var); 

    HRESULT hr = GetObjectProperty(pObject, L"Caption", &var); 

    if(FAILED(hr)) 
        return(hr); 

    if(SUCCEEDED((hr = VariantChangeType(&var, &var, 0, VT_BSTR)))) 
        if(NULL == (*pbstrCaption = SysAllocString(V_BSTR(&var)))) 
            hr = E_OUTOFMEMORY; 

    VariantClear(&var); 
    return(hr); 
} 

HRESULT GetDHCPEnabled(ISWbemObject* pObject, BOOL* pbEnabled) 
{ 
    assert(!IsBadWritePtr(pbEnabled, sizeof(*pbEnabled))); 

    VARIANT var; 
    VariantInit(&var); 

    HRESULT hr = GetObjectProperty(pObject, L"DHCPEnabled", &var); 

    if(FAILED(hr)) 
        return(hr); 

    if(SUCCEEDED((hr = VariantChangeType(&var, &var, 0, VT_BOOL)))) 
        *pbEnabled = (V_BOOL(&var) != VARIANT_FALSE); 

    VariantClear(&var); 
    return(hr); 
} 

int WINAPI _tWinMain(HINSTANCE, HINSTANCE, LPTSTR, int) 
{ 
  ISWbemObjectSet* pObjectSet = NULL; 
  ISWbemServices*  pServices  = NULL; 
  ISWbemObject*    pObject    = NULL; 
  IEnumVARIANT*    pEnum      = NULL; 
  IUnknown*        pUnk       = NULL; 
  VARIANT          varItem; 
  HRESULT          hr; 
  BSTR             bstrClass; 

    CoInitialize(NULL); 

    if(SUCCEEDED(CoGetObject(OLESTR("winmgmts:"), NULL, IID_ISWbemServices, (void**)&pServices))) 
    { 
        bstrClass = SysAllocString(OLESTR("Win32_NetworkAdapterConfiguration")); 

        if(SUCCEEDED(pServices->InstancesOf(bstrClass, 0, NULL, &pObjectSet))) 
        { 
            if(SUCCEEDED(pObjectSet->get__NewEnum(&pUnk))) 
            { 
                if(SUCCEEDED(pUnk->QueryInterface(IID_IEnumVARIANT, (void**)&pEnum))) 
                { 
                    while(S_OK == pEnum->Next(1, &varItem, NULL)) 
                    { 
                        if(FAILED(VariantChangeType(&varItem, &varItem, 0, VT_UNKNOWN))) 
                        { 
                            VariantClear(&varItem); 
                            continue; 
                        } 

                        pObject = NULL;                        
                        hr = V_UNKNOWN(&varItem)->QueryInterface(IID_ISWbemObject, (void**)&pObject); 
                        VariantClear(&varItem); 

                        if(FAILED(hr)) 
                            continue; 

                        BSTR bstrCaption; 
                        BOOL bEnabled; 

                        GetCaption(pObject, &bstrCaption); 
                        GetDHCPEnabled(pObject, &bEnabled); 

                        WCHAR szMessage[256]; 
                        wsprintfW(szMessage, L"DHCPEnabled = %u", bEnabled); 
                        MessageBoxW(NULL, szMessage, bstrCaption, MB_OK); 

                        SysFreeString(bstrCaption); 
                        pObject->Release(); 
                    } 
                    pEnum->Release(); 
                } 
                pUnk->Release(); 
            } 
            pObjectSet->Release(); 
        } 
        SysFreeString(bstrClass); 
        pServices->Release(); 
    } 
    CoUninitialize(); 
    return(0); 
}

Also bei mir geht der Code ohne Probleme...

Sorry die Frage galt dir hatte vergessen dein Beitrag zu setzen.

jetzt frag ich mich, warum das ein array is, und kein normaler string.

Da einem Netzwerkadapter mehrere IP-Adressen zugeorndet sein können.

Dobi schrieb:

normal muesste das vom inhalt und der art wie man es behandelt doch genau wie string DHCPServer; sein, oder?

Eben nicht (vielleicht auf Deinem Heim-PC... aber Server haben oft mehrere).

Dobi schrieb:

also jetzt meine frage: wie komme ich an die ip adresse ran?

Mit den SafeArray... Funktionen:
http://msdn.microsoft.com/library/en-us/automat/html/28a00e34-3b5e-4a16-9f4c-dd2a72dc8e46.asp