Example Code for Checking for Rights to Create attributeSchema and classSchema Objects

The following C/C++ function checks the allowedChildClassesEffective property on the schema container (IADs pointer to schema container is passed as a parameter) for the attributeSchema and classSchema classes. It returns S_OK if both classes are listed in allowedChildClassesEffective. If both are not, it returns S_FALSE.

//Function takes an IADs pointer to schema container as a parameter.
 
HRESULT HasSchemaAdditionRights(IADs *pSchema)
{
if (!pSchema)
  return E_POINTER;
HRESULT hr = E_FAIL;
VARIANT var;
VARIANT *pVar;
//Check access rights
BOOL bIsAddAttributeAllowed = FALSE;
BOOL bIsAddClassAllowed = FALSE;
//Get AllowedChildClassesEffective. It is constructed;
//therefore, you must use GetInfoEx to explicitly get it into the cache.
LPOLESTR pwszArray[] = {L"allowedChildClassesEffective"};
DWORD dwArrayItems = sizeof(pwszArray)/sizeof(LPOLESTR);
VARIANT vArray;
VariantInit(&vArray);
// Build a Variant of array type, using the specified string array.
hr = ADsBuildVarArrayStr(pwszArray, dwArrayItems, &vArray);
if (SUCCEEDED(hr))
{
  hr = pSchema->GetInfoEx(vArray,0L);
  if (SUCCEEDED(hr))
  {
    hr = pSchema->GetEx(L"allowedChildClassesEffective", &var);
    if (SUCCEEDED(hr))
    {
       hr = SafeArrayAccessData((SAFEARRAY*)(var.pparray), (void HUGEP* FAR*)&pVar);
       long lLBound, lUBound;
       //One dimensional array. Get the bounds for the array.
        hr = SafeArrayGetLBound((SAFEARRAY*)(var.pparray), 1, &lLBound);
       hr = SafeArrayGetUBound((SAFEARRAY*)(var.pparray), 1, &lUBound);
       //Get the count of elements
       long cElements = lUBound-lLBound + 1;
       //Get the elements of the array
       if (SUCCEEDED(hr))
       {
        for (int i = 0; i < cElements; i++ ) 
        {
          //Check each element to see if attributeSchema or classSchema is there.
          if (VT_BSTR == pVar[i].vt)
          {
            if (0==_wcsicmp(L"attributeSchema", pVar[i].bstrVal))
              bIsAddAttributeAllowed = TRUE;
            else if (0==_wcsicmp(L"classSchema", pVar[i].bstrVal))
              bIsAddClassAllowed = TRUE;
          }
        }
        if (bIsAddAttributeAllowed && bIsAddClassAllowed)
          hr = S_OK;
        else
          hr = S_FALSE;
       }
    }
    VariantClear(&var);
  }
}
 
return hr;
 
};