problem with CopyEx Method of the Win32_Directory Class in WMI   

Hello,

I need help with CopyEx function used in WMI. I try to write code which 
copies whole directory recursively. I found on net, that it is possible with 
WMI. I tried it but I get error and I don't know where is the problem. I 
found some examples on this topic on net, but only for C#, nothing for C++. 
So here is my code:

HRESULT CopyDirectory(LPCTSTR SourcePath, LPCTSTR DestPath)
{
    HRESULT hres;

    // Obtain the initial locator to WMI
    CComPtr<IWbemLocator> pLoc = NULL;

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

    if (FAILED(hres))
    {
        return hres;
    }

    // Connect to WMI through the IWbemLocator::ConnectServer method
    CComPtr<IWbemServices> pSvc = NULL;

    // Connect to the root\cimv2 namespace with
    // the current user and obtain pointer pSvc
    // to make IWbemServices calls.
    hres = pLoc->ConnectServer(
        _bstr_t(_T("\\\\.\\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
        );

    if (FAILED(hres))
    {
        return hres;
    }

    // Use the IWbemServices pointer to make requests of WMI ----
    // set up to call the Win32_Directory::CopyEx method
    _bstr_t MethodName(_T("CopyEx"));
    _bstr_t ClassName(_T("Win32_Directory"));

    // retrieves wbem class - Win32_Directory
    CComPtr<IWbemClassObject> pClass = NULL;
    hres = pSvc->GetObject(ClassName, 0, NULL, &pClass, NULL);
    if(FAILED(hres)) return hres;

    // create instance of class Win32_Directory
    CComPtr<IWbemClassObject> pClassInstance = NULL;
    hres = pClass->SpawnInstance(0, &pClassInstance);
    if(FAILED(hres)) return hres;

    // set source path -> Name property
    VARIANT varVariable;
    varVariable.vt = VT_BSTR;
    varVariable.bstrVal = _bstr_t(SourcePath);
    // Store the value for the Name property
    hres = pClassInstance->Put(_T("Name"), 0, &varVariable, 0);
    VariantClear(&varVariable);
    if(FAILED(hres)) return hres;

    // retrieves wbem class for InputParams -> uint32 CopyEx(string 
FileName, string StopFileName, string StartFileName, boolean Recursive);
    CComPtr<IWbemClassObject> pInParamsDefinition = NULL;
    hres = pClass->GetMethod(MethodName, 0,
        &pInParamsDefinition, NULL);
    if(FAILED(hres)) return hres;

    // create instance of method's InputParams
    CComPtr<IWbemClassObject> pInParamsClassInstance = NULL;
    hres = pInParamsDefinition->SpawnInstance(0, &pInParamsClassInstance);
    if(FAILED(hres)) return hres;

    // Create the values for the in parameters -> FileName param
    varVariable.vt = VT_BSTR;
    varVariable.bstrVal = _bstr_t(DestPath);
    // Store the value for the in parameters
    hres = pInParamsClassInstance->Put(_T("FileName"), 0, &varVariable, 0);
    VariantClear(&varVariable);
    if(FAILED(hres)) return hres;

    // Create the values for the in parameters -> Recursive param
    varVariable.vt = VT_BOOL;
    varVariable.boolVal = TRUE;
    // Store the value for the in parameters
    hres = pInParamsClassInstance->Put(_T("Recursive"), 0, &varVariable, 0);
    VariantClear(&varVariable);
    if(FAILED(hres)) return hres;
   
    // Execute Method CopyEx
    IWbemClassObject* pOutParams = NULL;
    hres = pSvc->ExecMethod(ClassName, MethodName, 0, NULL, 
pInParamsClassInstance, &pOutParams, NULL);
    // here I get error: WBEM_E_INVALID_METHOD_PARAMETERS
    if (FAILED(hres)) return hres;

    // if you want to see what the method returned,
    // use the following code.  The return value will
    // be in &varReturnValue
    VARIANT varReturnValue;
    hres = pOutParams->Get(_bstr_t(_T("ReturnValue")), 0, &varReturnValue, 
NULL, 0);
    if (FAILED(hres)) return hres;
   
    VariantClear(&varReturnValue);
   
    return ERROR_SUCCESS;
}


Please can someone help me? I get error as soon as I call ExecMethod 
function which should execute CopyEx. I created instance of Win32_Directory 
class, set Name property to source directory, then I created instance of 
class for Input Parameters, where I set destination directory to Filename 
property. Finally I call ExecMethod() where I get error. Its explanation in 
MSDN is:
This error results from one of two causes:

The supplied pInParams object was determined by the provider to be invalid.

The strObjPath parameter specifies a class without the [static] qualifier on 
the method.

But what did I wrong?

Thanks.

Michal

date: Mon, 7 Jul 2008 07:37:01 -0700   author:   trencan