XHLOCAL.h

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/*  XHLOCAL.h - HLOCAL wrapper
    Copyright (C) 2001-2004 Mark Weaver
    Written by Mark Weaver <mark@npsl.co.uk>

    Part of the Open-Win32 library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the
    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA  02111-1307, USA.
*/

#ifndef OW32_XHLOCAL_H
#define OW32_XHLOCAL_H

#include <OW32/OW32Libs.h>
#include <OW32/windows.h>

namespace OW32
{

class OW32_LIB_EXPORT XHLOCAL 
{
private:
    HLOCAL m_hLocal;
    bool m_bLocked;

    XHLOCAL(const XHLOCAL& );
    XHLOCAL& operator=(const XHLOCAL& );

public:
    XHLOCAL() : m_hLocal(NULL), m_bLocked(false) {} 
    
    XHLOCAL(HLOCAL h) : m_hLocal(h), m_bLocked(false) { }
    
    ~XHLOCAL() {
        Close();
    }
    
    void Close() {
        if (m_hLocal != NULL) {
            Unlock();
            LocalFree(m_hLocal);
            m_hLocal = NULL;
        }
    }
    
    operator HLOCAL() const { return m_hLocal; }
    
    HLOCAL* operator&() { return &m_hLocal; }

    LPVOID Lock() { 
        LPVOID Block = LocalLock(m_hLocal);
        if (!Block) return NULL;
        m_bLocked = true;
        return Block;
    }

    BOOL Unlock() {
        BOOL ret = TRUE;
        if (m_bLocked) {
            ret = LocalUnlock(m_hLocal);
            m_bLocked = false;
        }
        return ret;
    }

    HLOCAL operator=(HLOCAL h) { Close(); m_hLocal = h; return m_hLocal; }

    HLOCAL Detach() { HLOCAL h = m_hLocal; m_hLocal = NULL; return h; }
};

};

#endif // OW32_XHLOCAL_H

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