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# echointerface.h Example File
tools/echoplugin/echowindow/echointerface.h

     /****************************************************************************
     **
     ** Copyright (C) 2007-2007 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
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     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #ifndef ECHOINTERFACE_H
     #define ECHOINTERFACE_H

     class QString;

     class EchoInterface
     {
     public:
         virtual ~EchoInterface() {}
         virtual QString echo(const QString &message) = 0;
     };

     Q_DECLARE_INTERFACE(EchoInterface,
                         "com.trolltech.Plugin.EchoInterface/1.0");

     #endif