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/*****************************************************************************
*
* wiaitem.cpp
*
* Copyright (c) 2003 Microsoft Corporation. All Rights Reserved.
*
* DESCRIPTION:
*
* wiaitem is a simply wrapper class used to read properties from an item
* of interface IWiaItem2
*
*******************************************************************************/
#include "stdafx.h"
#include "wiaitem.h"
///
/// Constructor - sets m_pIWiaPropStg to NULL
///
CWiaItem::CWiaItem()
{
m_pIWiaPropStg = NULL;
}
///
/// Destructor
///
CWiaItem::~CWiaItem()
{
Release();
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::SetIWiaItem | Specifies the item to read from
*
* @parm IWiaItem2 | pIWiaItem |
* The item we want to read properties from
*
* @comm
* SetIWiaItem QIs the passed in IWiaItem2 object for its IWiaPropertyStorage interface
* which it stores internally and uses in the read and write functions.
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::SetIWiaItem(_In_ IWiaItem2 *pIWiaItem)
{
if (!pIWiaItem)
{
return E_INVALIDARG;
}
HRESULT hr = S_OK;
Release();
//
// Get WIA property storage interface and store into member variable
//
hr = pIWiaItem->QueryInterface(IID_IWiaPropertyStorage,(VOID**)&m_pIWiaPropStg);
return hr;
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::ReadPropertyLong | Reads a LONG value from the
* currently set item.
*
* @parm PROPID | PropertyID |
* Id of property to read
*
* @parm LONG* | plPropertyValue |
* Pointer where we store the result from the read operation.
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::ReadPropertyLong(PROPID PropertyID, _Out_ LONG *plPropertyValue)
{
if (!plPropertyValue)
{
return E_INVALIDARG;
}
if (!m_pIWiaPropStg)
{
return E_POINTER;
}
*plPropertyValue = 0;
PROPSPEC PropSpec[1];
PROPVARIANT PropVar[1];
memset(PropVar, 0, sizeof(PropVar));
PropVariantInit(PropVar);
PropSpec[0].ulKind = PRSPEC_PROPID;
PropSpec[0].propid = PropertyID;
HRESULT hr = S_OK;
hr = m_pIWiaPropStg->ReadMultiple(1, PropSpec, PropVar);
if (S_OK == hr)
{
*plPropertyValue = PropVar[0].lVal;
PropVariantClear(PropVar);
}
return hr;
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::ReadPropertyGUID | Reads a GUID value from the
* currently set item.
*
* @parm PROPID | PropertyID |
* Id of property to read
*
* @parm GUID* | pguidPropertyValue |
* Pointer where we store the result from the read operation.
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::ReadPropertyGUID(PROPID PropertyID, _Out_ GUID *pguidPropertyValue)
{
if (!pguidPropertyValue)
{
return E_INVALIDARG;
}
if (!m_pIWiaPropStg)
{
return E_POINTER;
}
memset(pguidPropertyValue, 0, sizeof(GUID));
PROPSPEC PropSpec[1];
PROPVARIANT PropVar[1];
memset(PropVar, 0, sizeof(PropVar));
PropVariantInit(PropVar);
PropSpec[0].ulKind = PRSPEC_PROPID;
PropSpec[0].propid = PropertyID;
HRESULT hr = S_OK;
hr = m_pIWiaPropStg->ReadMultiple(1, PropSpec, PropVar);
if (hr == S_OK)
{
memcpy(pguidPropertyValue,PropVar[0].puuid,sizeof(GUID));
PropVariantClear(PropVar);
}
return hr;
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::ReadPropertyBSTR | Reads a BSTR value from the
* currently set item.
*
* @parm PROPID | PropertyID |
* Id of property to read
*
* @parm BSTR* | pbstrPropertyValue |
* Pointer where we store the result from the read operation.
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::ReadPropertyBSTR(PROPID PropertyID, _Out_ BSTR *pbstrPropertyValue)
{
if (!pbstrPropertyValue)
{
return E_INVALIDARG;
}
if (!m_pIWiaPropStg)
{
return E_POINTER;
}
*pbstrPropertyValue = NULL;
PROPSPEC PropSpec[1];
PROPVARIANT PropVar[1];
memset(PropVar, 0, sizeof(PropVar));
PropVariantInit(PropVar);
PropSpec[0].ulKind = PRSPEC_PROPID;
PropSpec[0].propid = PropertyID;
HRESULT hr = S_OK;
hr = m_pIWiaPropStg->ReadMultiple(1, PropSpec, PropVar);
if (hr == S_OK)
{
*pbstrPropertyValue = SysAllocString(PropVar[0].bstrVal);
if (!*pbstrPropertyValue)
{
hr = E_OUTOFMEMORY;
}
PropVariantClear(PropVar);
}
return hr;
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::WritePropertyLong | Writes a LONG value to the
* currently set item.
*
* @parm PROPID | PropertyID |
* Id of property to read
*
* @parm LONG | lPropertyValue |
* Value to write
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::WritePropertyLong(PROPID PropertyID, LONG lPropertyValue)
{
if (!m_pIWiaPropStg)
{
return E_POINTER;
}
PROPSPEC PropSpec[1];
PROPVARIANT PropVar[1];
memset(PropVar, 0, sizeof(PropVar));
PropVariantInit(PropVar);
PropSpec[0].ulKind = PRSPEC_PROPID;
PropSpec[0].propid = PropertyID;
PropVar[0].vt = VT_I4;
PropVar[0].lVal = lPropertyValue;
HRESULT hr = S_OK;
hr = m_pIWiaPropStg->WriteMultiple(1, PropSpec, PropVar, MIN_PROPID);
return hr;
}
/*****************************************************************************
*
* @doc INTERNAL
*
* @func STDMETHODIMP | CWiaItem::WritePropertyGUID | Writes a GUID value to the
* currently set item.
*
* @parm PROPID | PropertyID |
* Id of property to read
*
* @parm GUID | guidPropertyValue |
* Value to write
*
* @rvalue S_OK |
* The function succeeded.
* @rvalue E_XXX |
* The function failed
*
*****************************************************************************/
HRESULT CWiaItem::WritePropertyGUID(PROPID PropertyID, GUID guidPropertyValue)
{
if (!m_pIWiaPropStg)
{
return E_POINTER;
}
PROPSPEC PropSpec[1];
PROPVARIANT PropVar[1];
memset(PropVar, 0, sizeof(PropVar));
PropVariantInit(PropVar);
PropSpec[0].ulKind = PRSPEC_PROPID;
PropSpec[0].propid = PropertyID;
PropVar[0].vt = VT_CLSID;
PropVar[0].puuid = &guidPropertyValue;
HRESULT hr = S_OK;
hr = m_pIWiaPropStg->WriteMultiple(1, PropSpec, PropVar, MIN_PROPID);
return hr;
}
///
/// Release releases the IWiaPropertyStorage member variable
///
void CWiaItem::Release()
{
if (m_pIWiaPropStg)
{
m_pIWiaPropStg->Release();
m_pIWiaPropStg = NULL;
}
}
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