SafeArrayAccessData function (oleauto.h)

Increments the lock count of an array, and retrieves a pointer to the array data.

Syntax

HRESULT SafeArrayAccessData(
  [in]  SAFEARRAY  *psa,
  [out] void HUGEP **ppvData
);

Parameters

[in] psa

An array descriptor created by SafeArrayCreate.

[out] ppvData

The array data.

Return value

This function can return one of these values.

Remarks

After calling SafeArrayAccessData, you must call the SafeArrayUnaccessData function to unlock the array.

Examples

The following example sorts a safe array 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);

Requirements