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

 /****************************************************************************
 **
 ** Copyright (C) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact [email protected] if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
 **
 ** 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