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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: comtools.hxx,v $
* $Revision: 1.5 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#pragma once
#include <string>
#include <stdexcept>
#if defined _MSC_VER
#pragma warning(push,1)
#endif
#include <objbase.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif
namespace sal
{
namespace systools
{
typedef int HRESULT;
/* Simple exception class for propagating COM errors */
class ComError : public std::runtime_error
{
public:
ComError(const std::string& message, HRESULT hr) :
std::runtime_error(message),
hr_(hr)
{}
HRESULT GetHresult() const
{
return hr_;
}
private:
HRESULT hr_;
};
/* A simple COM smart pointer template */
template <typename T>
class COMReference
{
public:
COMReference() :
com_ptr_(NULL)
{
}
explicit COMReference(T* comptr) :
com_ptr_(comptr)
{
addRef();
}
/* Explicitly controllable whether AddRef will be called or not */
COMReference(T* comptr, bool bAddRef) :
com_ptr_(comptr)
{
if (bAddRef)
addRef();
}
COMReference(const COMReference<T>& other) :
com_ptr_(other.com_ptr_)
{
addRef();
}
COMReference<T>& operator=(const COMReference<T>& other)
{
if (other.com_ptr_)
other.com_ptr_->AddRef();
release();
com_ptr_ = other.com_ptr_;
return *this;
}
COMReference<T>& operator=(T* comptr)
{
release();
com_ptr_ = comptr;
addRef();
return *this;
}
~COMReference()
{
release();
}
template<typename InterfaceType>
COMReference<InterfaceType> QueryInterface(REFIID iid)
{
COMReference<InterfaceType> ip;
HRESULT hr = E_FAIL;
if (com_ptr_)
hr = com_ptr_->QueryInterface(iid, reinterpret_cast<LPVOID*>(&ip));
if (FAILED(hr))
throw ComError("QueryInterface failed: Interface not supported!", hr);
return ip;
}
T* operator->() const
{
return com_ptr_;
}
T& operator*() const
{
return *com_ptr_;
}
/* Necessary for assigning com_ptr_ from functions like
CoCreateInstance which require a 'void**' */
T** operator&()
{
release();
com_ptr_ = NULL;
return &com_ptr_;
}
T* get() const
{
return com_ptr_;
}
COMReference<T>& clear()
{
release();
com_ptr_ = NULL;
return *this;
}
bool is() const
{
return (com_ptr_ != NULL);
}
private:
ULONG addRef()
{
ULONG cnt = 0;
if (com_ptr_)
cnt = com_ptr_->AddRef();
return cnt;
}
ULONG release()
{
ULONG cnt = 0;
if (com_ptr_)
cnt = com_ptr_->Release();
return cnt;
}
private:
T* com_ptr_;
};
} // systools
} // sal
/* Typedefs for some popular COM interfaces */
typedef sal::systools::COMReference<IDataObject> IDataObjectPtr;
typedef sal::systools::COMReference<IStream> IStreamPtr;
typedef sal::systools::COMReference<IEnumFORMATETC> IEnumFORMATETCPtr;
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