Hello everybody,

I have been very busy in the last couple of weeks so I left this problem aside. Yesterday I managed to solve my problem using the QMetaObject functionalities. See code example below to see how I managed to achieve my goal.

Thank you all for your help.

Regards.


myClass.h:
Qt Code: 
  1. #ifndef MY_CLASS_H
  2. #define MY_CLASS_H
  3.  
  4. #include <QObject>
  5. #include <QThread>
  6. #include <QIODevice>
  7.  
  8. class MyClass : public QThread
  9. {
  10. Q_OBJECT
  11.  
  12. public:
  13.  
  14.     explicit MyClass(QIODevice* inputDevice = 0, QObject *parent = 0);
  15.     ~MyClass();
  16.  
  17.     void sendData(quint8 id, QByteArray data);
  18.  
  19.     some other members ...
  20.  
  21. private:
  22.  
  23.       QIODevice* m_pInputDevice;
  24.       QIODevice* m_pForwardDevice;
  25.  
  26.       some other members ...
  27.  
  28. };
  29.  
  30. #endif // MY_CLASS_H
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myClass.cpp
Qt Code: 
  1. #include "MyClass.h"
  2.  
  3. MyClass::MyClass(QIODevice* inputDevice, QObject *parent) :
  4.     QThread(parent), m_pInputDevice(inputDevice), m_pForwardDevice(NULL), m_bForwardData(false)
  5. {
  6. }
  7.  
  8. MyClass::~MyClass()
  9. {
  10.     bool bRet;
  11.         if(m_pInputDevice)
  12.         {
  13.             QMetaObject::invokeMethod(m_pInputDevice, "isOpen",
  14.                                       Qt::DirectConnection, Q_RETURN_ARG(bool, bRet));
  15.             if(bRet)
  16.             {
  17.                 QMetaObject::invokeMethod(m_pInputDevice, "close",
  18.                                           Qt::DirectConnection);
  19.             }
  20.         }
  21.  
  22.         if(m_pForwardDevice)
  23.         {
  24.             QMetaObject::invokeMethod(m_pForwardDevice, "isOpen",
  25.                                       Qt::DirectConnection, Q_RETURN_ARG(bool, bRet));
  26.             if(bRet)
  27.             {
  28.                 QMetaObject::invokeMethod(m_pForwardDevice, "close",
  29.                                           Qt::DirectConnection);
  30.             }
  31.     }
  32. }
  33.  
  34.  // use case example
  35.  
  36. void MyClass::sendData(quint8 id, QByteArray data)
  37. {
  38.     bool bRet;
  39.     if (!m_pInputDevice)
  40.     {
  41.         emit error("Input device not set!");
  42.         return;
  43.     }
  44.  
  45.     QMetaObject::invokeMethod(m_pInputDevice, "isOpen",
  46.                               Qt::DirectConnection, Q_RETURN_ARG(bool, bRet));
  47.     if(!bRet)
  48.     {
  49.         emit error("Input device is not open");
  50.         return;
  51.     }
  52.  
  53.     QFlags<QIODevice::OpenModeFlag> openMode;
  54.     QMetaObject::invokeMethod(m_pInputDevice, "openMode",
  55.                               Qt::DirectConnection, Q_RETURN_ARG(QFlags<QIODevice::OpenModeFlag>, openMode));
  56.     if (openMode == QIODevice::ReadOnly)
  57.     {
  58.         emit error("Input device is in read only mode!");
  59.         return;
  60.     }
  61.  
  62.     // some processing...
  63.  
  64.     qint64 bytesWritten;
  65.     QMetaObject::invokeMethod(m_pInputDevice, "write",
  66.                               Qt::DirectConnection, Q_RETURN_ARG(qint64, bytesWritten), Q_ARG(QByteArray, data));
  67.     if(bytesWritten == -1)
  68.         emit error("Data output failed.");
  69. }
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Example of SslIODevice

SslIODevice.h:
Qt Code: 
  1. #ifndef SSL_IO_DEVICE_H
  2. #define SSL_IO_DEVICE_H
  3.  
  4. #include <QSslSocket>
  5.  
  6. class SslIODevice : public QSslSocket
  7. {
  8. Q_OBJECT
  9.  
  10. public:
  11.  
  12.     explicit SslIODevice();
  13.     ~SslIODevice();
  14.  
  15.     //For each QIODevice method I use
  16.     Q_INVOKABLE [I]returnType[/I] method([I]args[/I]);
  17.     some other members ...
  18.  
  19. private:
  20.  
  21.       some private members ...
  22.  
  23. };
  24.  
  25. #endif // SSL_IO_DEVICE_H
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SslIODevice.cpp
Qt Code: 
  1. #include "SslIODevice.h"
  2.  
  3. SslIODevice::SslIODevice() :
  4.     QSslSocket()
  5. {
  6. }
  7.  
  8. SslIODevice::~SslIODevice()
  9. {
  10. }
  11.  
  12. //For each QIODevice method I use
  13. [I]returnType[/I] SslIODevice::method([I]args[/I])
  14. {
  15.     return QSslSocket::method([I]args[/I]);
  16. }
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