167 lines
4 KiB
C++
167 lines
4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#pragma once
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#if !defined WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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#include <objidl.h>
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#include "WinClip.hxx"
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#define AUTO_INIT true
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// a helper class to manage a global memory area, the clients can write
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// into the global memory area and extract the handle to the global mem
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// note: not thread-safe
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class CStgTransferHelper
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{
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public:
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// will be thrown in case of failures
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class CStgTransferException
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{
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public:
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HRESULT m_hr;
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explicit CStgTransferException( HRESULT hr ) : m_hr( hr ) {};
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};
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public:
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CStgTransferHelper(
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bool bAutoInit = false,
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HGLOBAL hGlob = nullptr,
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bool bDelStgOnRelease = false );
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~CStgTransferHelper( );
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void write( const void* lpData, ULONG cb, ULONG* cbWritten = nullptr );
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void read( LPVOID pv, ULONG cb, ULONG* pcbRead = nullptr );
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HGLOBAL getHGlobal( ) const;
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void getIStream( LPSTREAM* ppStream );
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void init(
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SIZE_T newSize,
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sal_uInt32 uiFlags = GHND,
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bool bDelStgOnRelease = false );
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void init(
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HGLOBAL hGlob,
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bool bDelStgOnRelease = false );
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// returns the size of the managed memory
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sal_uInt32 memSize( CLIPFORMAT cf = CF_INVALID ) const;
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// free the global memory and necessary
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// release the internal stream pointer
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void cleanup( );
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private:
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LPSTREAM m_lpStream;
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bool m_bDelStgOnRelease;
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private:
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CStgTransferHelper( const CStgTransferHelper& );
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CStgTransferHelper& operator=( const CStgTransferHelper& );
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};
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// something like an auto-pointer - allows access to the memory belonging
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// to a HGLOBAL and automatically unlocks a global memory at destruction
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// time
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class CRawHGlobalPtr
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{
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public:
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// ctor
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explicit CRawHGlobalPtr( HGLOBAL hGlob ) :
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m_hGlob( hGlob ),
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m_bIsLocked( false ),
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m_pGlobMem( nullptr )
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{
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}
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// ctor
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explicit CRawHGlobalPtr( const CStgTransferHelper& theHGlobalHelper ) :
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m_hGlob( theHGlobalHelper.getHGlobal( ) ),
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m_bIsLocked( false ),
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m_pGlobMem( nullptr )
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{
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}
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// dtor
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~CRawHGlobalPtr( )
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{
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if ( m_bIsLocked )
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GlobalUnlock( m_hGlob );
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}
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// lock the global memory (initializes a
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// pointer to this memory)
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BOOL Lock( )
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{
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if ( !m_bIsLocked && ( nullptr != m_hGlob ) )
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{
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m_pGlobMem = GlobalLock( m_hGlob );
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m_bIsLocked = ( nullptr != m_pGlobMem );
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}
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return m_bIsLocked;
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}
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// unlock the global memory (invalidates the
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// pointer to this memory)
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BOOL Unlock( )
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{
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GlobalUnlock( m_hGlob );
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m_bIsLocked = false;
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m_pGlobMem = nullptr;
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return ( NO_ERROR == GetLastError( ) );
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}
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// locks the global memory and returns a
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// pointer to this memory
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LPVOID GetMemPtr( )
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{
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Lock( );
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return m_pGlobMem;
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}
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// size of mem we point to
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int MemSize( ) const
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{
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return GlobalSize( m_hGlob );
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}
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private:
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HGLOBAL m_hGlob;
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bool m_bIsLocked;
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LPVOID m_pGlobMem;
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};
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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