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

     /****************************************************************************
     **
     ** Copyright (C) 2007-$THISYEAR$ $TROLLTECH$. All rights reserved.
     **
     ** This file is part of the $MODULE$ of the Qt Toolkit.
     **
     ** $TROLLTECH_DUAL_LICENSE$
     **
     ** 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

     #include <QString>

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

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

     #endif