XHGLOBAL.h

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/*  XHGLOBAL.h - HGLOBAL 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_XHGLOBAL_H
#define OW32_XHGLOBAL_H

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

namespace OW32
{

class OW32_LIB_EXPORT XHGLOBAL 
{
private:
    HGLOBAL m_hGlobal;
    bool m_bLocked;

    XHGLOBAL(const XHGLOBAL& );
    XHGLOBAL& operator=(const XHGLOBAL& );

public:
    XHGLOBAL() : m_hGlobal(NULL), m_bLocked(false) {} 

    XHGLOBAL(HGLOBAL h) : m_hGlobal(h), m_bLocked(false) { }

    ~XHGLOBAL() {
        Close();
    }

    void Close() {
        if (m_hGlobal != NULL) {
            Unlock();
            GlobalFree(m_hGlobal);
            m_hGlobal = NULL;
        }
    }

    operator HGLOBAL() const { return m_hGlobal; }

    HGLOBAL* operator&() { return &m_hGlobal; }

    LPVOID Lock() { 
        LPVOID Block = GlobalLock(m_hGlobal);
        if (!Block) return NULL;
        m_bLocked = true;
        return Block;
    }

    BOOL Unlock() {
        BOOL ret = TRUE;
        if (m_bLocked) {
            ret = GlobalUnlock(m_hGlobal);
            m_bLocked = false;
        }
        return ret;
    }

    HGLOBAL operator=(HGLOBAL h) { Close(); m_hGlobal = h; return m_hGlobal; }

    HGLOBAL Detach() { HGLOBAL h = m_hGlobal; m_hGlobal = NULL; return h; }
};

}

#endif // OW32_XHGLOBAL_H

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