/*****************************************************************************
*
* File: util.h
*
* Description: This file contains declarations and definitions for simple COM
* helper classes.
*
* ------------------------------------
*
* This file is part of the Microsoft Windows SDK Code Samples.
*
* Copyright (C) Microsoft Corporation. All rights reserved.
*
* This source code is intended only as a supplement to Microsoft
* Development Tools and/or on-line documentation. See these other
* materials for detailed information regarding Microsoft code samples.
*
* THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
* KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
* PARTICULAR PURPOSE.
*
****************************************************************************/
#pragma once
// Non-throwing, simplified alternative to the ATL Variant class
class AutoVariant :
public VARIANT
{
public:
AutoVariant()
{
VariantInit(this);
}
~AutoVariant()
{
VariantClear(this);
}
HRESULT
SetBSTRValue(
LPCWSTR sourceString
)
{
VariantClear(this);
V_VT(this) = VT_BSTR;
V_BSTR(this) = SysAllocString(sourceString);
if (!V_BSTR(this))
{
return E_OUTOFMEMORY;
}
return S_OK;
}
void
SetObjectValue(
IUnknown *sourceObject
)
{
VariantClear(this);
V_VT(this) = VT_UNKNOWN;
V_UNKNOWN(this) = sourceObject;
if (V_UNKNOWN(this))
{
V_UNKNOWN(this)->AddRef();
}
}
};