SafeArrayAccessData

發行項
11/18/2015

A version of this page is also available for

4/8/2010

This function increments the lock count of an array and retrieves a pointer to the array data.

Syntax

HRESULT SafeArrayAccessData( 
  SAFEARRAY FAR* psa, 
  void HUGEP* FAR* ppvData 
);

Parameters

psa
[in] Pointer to an array descriptor created by SafeArrayCreate.

ppvData
[in] On exit, pointer to a pointer to the array data.

Return Value

Returns the HRESULT values shown in the following table.

Value	Description
S_OK	Success.
E_INVALIDARG	The psa parameter was not a valid safearray descriptor.
E_UNEXPECTED	The array could not be locked.

Remarks

Passing invalid (and under some circumstances NULL) pointers to this function causes an unexpected termination of the application.

Example

The following code 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* FAR*)&pBSTR);
if (FAILED(hr))
goto error;
// Bubble sort.
cElements = lUBound–lLBound+1; 
for (i = 0; i < cElements–1; i++)
{
  min = i;
  for (j = i+1; j < 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

Header	oleauto.h
Library	oleaut32.lib
Windows Embedded CE	Windows CE 2.0 and later
Windows Mobile	Windows Mobile Version 5.0 and later

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