qsharedmemory between Qt and c program on linux plateform

[marwan]

Hi everybody
I 'm beginner in Qt, I have a problem to read a shared memory segment generated by c program on qt application using nativekey().
if someone have any idea or solution please help me
my c prog generate a data on shared memory with this key-id 0x00313233
and this is my source :

QSharedMemory shm("123");
   if (shm.isAttached())
       shm.detach();
   if (!shm.attach(QSharedMemory::ReadWrite)) {
       // Shared memory n'est pas crée donc création
       if (!shm.create(1024, QSharedMemory::ReadWrite)) {
           QSharedMemory::SharedMemoryError err = shm.error();
           qDebug()<< err <<"Erreur lors de création de shared memory";
       }
       else {
           qDebug()<< "memory attached successfully";
           qDebug()<< "memory created successfully";
           qDebug()<< "memory keyid"<<shm.key().toAscii().toHex();
 
           if(shm.lock()){
             qDebug()<<"Memory locked successefully";
             QByteArray s = QByteArray((char*) shm.constData(), shm.size());
             QString message = QString::fromUtf8(s.constData());
             qDebug() << message;
 
             if(shm.unlock()){
              qDebug()<< "Memory unlocked successefully";
              if(shm.detach())
                  qDebug()<<"Memory detached successefully";
              else qDebug()<<"Memory detached failed"<< shm.error();
               }
             else qDebug()<< "Memory unlock failed"<< shm.error();
            }
           else qDebug()<<"Memory lock failed"<< shm.error();
       }
   }
 
 
QTextEdit *textedit= new QTextEdit(s);
QHBoxLayout *layout = new QHBoxLayout( &mainwindow );

QSharedMemory shm("123");
   if (shm.isAttached())
       shm.detach();
   if (!shm.attach(QSharedMemory::ReadWrite)) {
       // Shared memory n'est pas crée donc création
       if (!shm.create(1024, QSharedMemory::ReadWrite)) {
           QSharedMemory::SharedMemoryError err = shm.error();
           qDebug()<< err <<"Erreur lors de création de shared memory";
       }
       else {
           qDebug()<< "memory attached successfully";
           qDebug()<< "memory created successfully";
           qDebug()<< "memory keyid"<<shm.key().toAscii().toHex();

           if(shm.lock()){
             qDebug()<<"Memory locked successefully";
             QByteArray s = QByteArray((char*) shm.constData(), shm.size());
             QString message = QString::fromUtf8(s.constData());
             qDebug() << message;

             if(shm.unlock()){
              qDebug()<< "Memory unlocked successefully";
              if(shm.detach())
                  qDebug()<<"Memory detached successefully";
              else qDebug()<<"Memory detached failed"<< shm.error();
               }
             else qDebug()<< "Memory unlock failed"<< shm.error();
            }
           else qDebug()<<"Memory lock failed"<< shm.error();
       }
   }


QTextEdit *textedit= new QTextEdit(s);
QHBoxLayout *layout = new QHBoxLayout( &mainwindow );

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