text: /****************************************************************************
  **
  ** Copyright (C) 2020 Adrian Böckenkamp
  ** Copyright (C) 2016 The Qt Company Ltd
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and The Qt Company. For licensing terms
  ** and conditions see https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** "Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #ifndef CONSUMER_DIALOG_H
  #define CONSUMER_DIALOG_H
  
  // Abstract: this C++ application contains the consumer logic, i.e., it waits until the Python app
  //           has created (aka produced) an image and put that into a shared memory segment. This app
  //           then displays (aka consumes) the image. By changing CONSUMER in the code base of both
  //           apps, the behavior can be inverted. It surely also works when using only C++ or only
  //           only Python apps (one consumer, one producer of course).
  
  #define CONSUMER 1 // 1: this is the consumer, 0: this is the producer
  
  // (System-wide) Unique name of the shared memory; must be equal in all apps using the memory:
  #define UNIQUE_SHARED_MEMORY_NAME  "MySharedMemoryDefault"
  // Hardcoded file name of file to be used for specifying an alternative name of the shared memory.
  // If that file exists, its first line is ALWAYS used as the shared memory's name:
  #define SHARED_MEMORY_KEY_FILE     "shared_memory.key"
  
  // Enable or disable sharing a format-specified struct between Python and C++, see
  //  - https://github.com/karkason/cppystruct
  //  - https://docs.python.org/2/library/struct.html
  // (Only works if this is the consumer.)
  #define SHARED_STRUCT
  // Format of data to be shared: datatype (type, size) and order, see
  // https://docs.python.org/2/library/struct.html#format-characters
  #define STRUCT_FORMAT "<I?30s"
  
  #include <QDialog>
  #include <QString>
  
  #include "ui_dialog.h"
  #if CONSUMER == 1
  #include <prodcon_ipc/consumer_ipc.h>
  #elif CONSUMER == 0
  #include <prodcon_ipc/producer_ipc.h>
  #else
    #error Invalid value for <CONSUMER> define, should be 0 (= producer) or 1 (= consumer).
  #endif
  
  class ConsumerDialog : public QDialog {
    Q_OBJECT
  
  public:
    ConsumerDialog(QWidget *parent = nullptr);
    ~ConsumerDialog();
  
  public slots:
    void loadFromFile();
    void loadFromMemory();
  
  private:
    Ui::Dialog ui;
  
  #if CONSUMER == 1
   #ifdef SHARED_STRUCT
    QSharedMemory shmem_config;
   #endif
    ConsumerIPC cipc;
  #else
    ProducerIPC pipc;
  #endif
  };
  
  #endif // CONSUMER_DIALOG_H
  