PureBoard

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Example
The following example sorts a safearray of one dimension that contains BSTRs by accessing the array elements directly. This approach is faster than using SafeArrayGetElement and SafeArrayPutElement.

long i, j, min;
BSTR bstrTemp;
BSTR HUGEP *pbstr;
HRESULT hr;

// Get a pointer to the elements of the array.
hr = SafeArrayAccessData(psa, (void HUGEP**)&pbstr);
if (FAILED(hr))
goto error;

// Selection sort.
for (i = 0; i < psa->rgsabound.cElements-1; i++)
{
   min = i;
   for (j = i+1; j < psa->rgsabound.cElements; j++)
   {
      if (wcscmp(pbstr[j], pbstr[min]) < 0)
         min = j;
   }

   // Swap array[min] and array[i].
   bstrTemp = pbstr[min];
   pbstr[min] = pbstr[i];
   pbstr[i] = bstrTemp;

}

SafeArrayUnaccessData(psa);

Code: Alles auswählen

Example
The following example is taken from the COM Fundamentals SPoly sample (Cenumpt.cpp) shipped with the Platform SDK.


STDMETHODIMP CEnumPoint::Next(
   ULONG celt,
   VARIANT FAR rgvar[],
   ULONG * pceltFetched)
{
   unsigned int i;
   long ix;
   HRESULT hresult;

   for(i = 0; i < celt; ++i)
      VariantInit(&rgvar[i]);

   for(i = 0; i < celt; ++i){
      // Are we at the last element?
      if(m_iCurrent == m_celts){
      hresult = S_FALSE;
         goto LDone;
   }

      ix = m_iCurrent++;
      // m_psa is a global variable that holds the safe array.
      hresult = SafeArrayGetElement(m_psa, &ix, &rgvar[i]);
      if(FAILED(hresult))
         goto LError0;
   }
   hresult = NOERROR;

LDone:;
   if (pceltFetched != NULL)
      *pceltFetched = i;

   return hresult;


LError0:;
   for(i = 0; i < celt; ++i)
      VariantClear(&rgvar[i]);
   return hresult;
}
Requirements