来自ExecMethod的错误WBEM_E_INVALID_METHOD_PARAMETERS

Question

我正在尝试使用SoftwareLicensingService :: InstallProductKey通过服务中的WMI / C ++在Windows 7上安装产品密钥。但是，每次尝试通过IWbemServices :: ExecMethod调用该方法时，都会得到0x8004102f，即WBEM_E_INVALID_METHOD_PARAMETERS。我以为这与我传递的产品密钥有关，但是从那时起，我一直尝试对Win32_WindowsProductActivation :: ActivateOnline [在XP上没有参数方法，但有相同的错误]使用类似的代码。有谁知道下面我的代码片段中有什么可疑的内容（我跳过了一些简短的清理代码）？但是，相同的代码序列可以成功调用其他WMI方法。

int _tmain(int argc, _TCHAR* argv[])
{
    HRESULT hr = S_OK;
    IWbemLocator *pLoc = NULL;
    IWbemServices *pServices = NULL;
    IWbemClassObject *pInputParamsClass = NULL;
    IWbemClassObject *pInputParams = NULL;
    IWbemClassObject *pOutputParams = NULL;
    IWbemClassObject *pLicensingClsObj = NULL;
    VARIANT vtProductKey = {0};
    VARIANT vtPath = {0};


    hr =  CoInitializeEx(0, COINIT_MULTITHREADED);
    if(FAILED(hr))
        goto cleanup;

hr =  CoInitializeSecurity(NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_DEFAULT, 
            RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);
_ASSERT(SUCCEEDED(hr));
if(FAILED(hr))
    goto cleanup;

hr = CoCreateInstance(CLSID_WbemLocator, 0, CLSCTX_INPROC_SERVER, 
            IID_IWbemLocator, (LPVOID *)&pLoc);
_ASSERT(SUCCEEDED(hr) && (NULL != pLoc));
if(FAILED(hr) || (NULL == pLoc))
    goto cleanup;

hr = pLoc->ConnectServer(_bstr_t(L"ROOT\\CIMV2"), NULL, NULL, 0, NULL, 
            0, 0, &pServices);
_ASSERT(SUCCEEDED(hr) && (NULL != pServices));
if(FAILED(hr) || (NULL == pServices))
    goto cleanup;

hr = CoSetProxyBlanket(pServices, RPC_C_AUTHN_WINNT, 
   RPC_C_AUTHZ_NONE, NULL, RPC_C_AUTHN_LEVEL_CALL, RPC_C_IMP_LEVEL_IMPERSONATE,
   NULL, EOAC_NONE);
_ASSERT(SUCCEEDED(hr));
if(FAILED(hr))
    goto cleanup;

hr = pServices->GetObject(_bstr_t(L"SoftwareLicensingService"), 
                        0, NULL, &pLicensingClsObj, NULL);
_ASSERT(SUCCEEDED(hr) && (NULL != pLicensingClsObj));
if(FAILED(hr) || (NULL == pLicensingClsObj))
    goto cleanup;

hr = pLicensingClsObj->Get(L"__Path", 0, &vtPath, 0, 0);
_ASSERT(SUCCEEDED(hr));
if(FAILED(hr))
    goto cleanup;

hr = pLicensingClsObj->GetMethod(L"InstallProductKey", 0, 
            &pInputParamsClass, NULL);
_ASSERT(SUCCEEDED(hr) && (NULL != pInputParamsClass));
if(FAILED(hr) || (NULL == pInputParamsClass))
    goto cleanup;

hr = pInputParamsClass->SpawnInstance(0, &pInputParams);
_ASSERT(SUCCEEDED(hr) && (NULL != pInputParams));
if(FAILED(hr) || (NULL == pInputParams))
    goto cleanup;

vtProductKey.vt = VT_BSTR;
vtProductKey.bstrVal = SysAllocString(L"XXXXXXXXXXXXXXXXXXXXXXXXX");
hr = pInputParams->Put(L"ProductKey", 0, &vtProductKey, 0);
_ASSERT(SUCCEEDED(hr));
if(FAILED(hr))
    goto cleanup;

hr = pServices->ExecMethod(vtPath.bstrVal, 
            _bstr_t(L"InstallProductKey"), 
            0, NULL, pInputParams, 
            &pOutputParams, NULL);
_ASSERT(SUCCEEDED(hr) && (NULL != pOutputParams));
if(FAILED(hr) || (NULL == pOutputParams))
    goto cleanup;

hr = S_OK;//all success

cleanup:
if(NULL != pLoc)
{
    pLoc->Release();
    pLoc = NULL;
}
if(NULL != pServices)
{
    pServices->Release();
    pServices = NULL;
}
(VOID)CoUninitialize();
return hr;

}

Answer 1

此后，我弄清楚了问题所在。方法调用是在类而不是实例上进行的。

Answer 2

此代码将正常工作：

 IEnumWbemClassObject * enum_obj;
    hres = pSvc>CreateInstanceEnum(_bstr_t(L"SoftwareLicensingService"),WBEM_FLAG_RETURN_IMMEDIATELY , NULL ,&enum_obj);


   IWbemClassObject * spInstance;
   ULONG uNumOfInstances = 0;
   hres = enum_obj->Next(10000, 1,&spInstance,&uNumOfInstances);

   VARIANT path;
   hres = spInstance->Get(_bstr_t("__Path"), 0,&path, 0, 0);

   IWbemClassObject *results = NULL;
   hres = pSvc->ExecMethod( path.bstrVal, _bstr_t( L"InstallProductKey" ), 0,
   NULL,NULL,&results, NULL );

此代码不仅适用于此类和方法。通常对于任何类，您都可以获取objectPath（ExecMethod（）的第一个参数）并使用它。所提到的此代码用于调用不带参数的方法。

具有参数调用方法的代码可用here。在某些情况下，使用方法的输入参数调用ExecMethod会返回WBEM_E_INVALID_METHOD_PARAMETERS错误。在这种情况下，您可以先获取对象路径，然后调用GetObejct和GetMethod函数。