109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
/*++
|
|
|
|
Copyright (c) 2000 Microsoft Corporation
|
|
|
|
Module Name :
|
|
sahlp.h
|
|
|
|
Abstract:
|
|
Simple helpers for dealing with safearrays
|
|
|
|
Author:
|
|
Kulo Rajasekaran (kulor) 5/25/2000
|
|
|
|
Environment:
|
|
Win32
|
|
|
|
Project:
|
|
utils
|
|
|
|
Revision History:
|
|
|
|
--*/
|
|
|
|
#pragma once
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// SA_CreateOneDim
|
|
//
|
|
// Description
|
|
// Use this to create a 0 based, one dimensional safearray of any of the datatypes
|
|
// supported by VARIANT
|
|
//
|
|
// Ex: SAFEARRAY *psa = NULL;
|
|
// SA_CreateOneDim ( psa, 5, VT_BSTR );
|
|
// for (ULONG i=0 ; i<5 ; i++ ) {
|
|
// SafeArrayPutElement ( psa, &i, pSomeValidBstrHere );
|
|
//
|
|
inline HRESULT SA_CreateOneDim
|
|
(
|
|
SAFEARRAY **ppsa,
|
|
DWORD cElems,
|
|
short vt
|
|
)
|
|
{
|
|
HRESULT hr = S_OK;
|
|
SAFEARRAY *psa = NULL;
|
|
SAFEARRAYBOUND bound;
|
|
long *plAddr = NULL;
|
|
long lIdx = 0L;
|
|
UINT nElemSize = 0;
|
|
|
|
bound.lLbound = 0;
|
|
bound.cElements = cElems;
|
|
|
|
psa = ::SafeArrayCreate ( vt, 1, &bound );
|
|
if ( !psa ) {
|
|
hr = E_FAIL;
|
|
goto exit;
|
|
}
|
|
|
|
::SafeArrayPtrOfIndex( psa, &lIdx, (void**)&plAddr );
|
|
nElemSize = ::SafeArrayGetElemsize( psa );
|
|
|
|
memset(plAddr, 0L, cElems * nElemSize);
|
|
|
|
*ppsa = psa;
|
|
|
|
exit:
|
|
if ( FAILED(hr) )
|
|
if ( psa )
|
|
::SafeArrayDestroy ( psa );
|
|
|
|
return ( hr );
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// Variant_CreateOneDim
|
|
//
|
|
// Description
|
|
// Use this to create a safearray ( of type vt ) with in the passed Variant
|
|
//
|
|
// See SA_CreateOneDim for description
|
|
//
|
|
inline HRESULT Variant_CreateOneDim ( VARIANT *pv, DWORD cElems, short vt = VT_VARIANT)
|
|
{
|
|
HRESULT hr;
|
|
|
|
hr = ::VariantClear(pv);
|
|
|
|
hr = SA_CreateOneDim ( &pv->parray, cElems, vt );
|
|
|
|
if ( SUCCEEDED(hr) )
|
|
pv->vt = vt | VT_ARRAY;
|
|
|
|
return ( hr );
|
|
}
|
|
|
|
inline HRESULT Variant_DestroyOneDim( VARIANT *pv )
|
|
{
|
|
HRESULT hr = E_FAIL;
|
|
|
|
SAFEARRAY *psa = pv->parray;
|
|
_ASSERTE (psa != NULL);
|
|
|
|
hr = SafeArrayDestroy(psa);
|
|
|
|
return hr;
|
|
}
|