QDataStream, QTreeWidgetItem, pointer

**baca** · 15th February 2007, 09:29

At another QT forum I asked about stream and pointer: http://www.qtforum.org/thread.php?threadid=19550 and founded answer. Today I found this: http://www.qtcentre.org/forum/f-newb...void-3247.html. Because I'm not sure I ask more precision:

If I want put into stream pointer to QTableWidgetItem I do this like that:

Qt Code:

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QTreeWidgetItem *item;
QDataStream stream_items;
int i;
 
 (...) 
 
// to stream
stream_items << reinterpret_cast<int> (item);
 
// from stream
stream_items >> i;
item = reinterpret_cast<QTreeWidgetItem *> (i);

QTreeWidgetItem *item;
QDataStream stream_items;
int i;

 (...) 

// to stream
stream_items << reinterpret_cast<int> (item);

// from stream
stream_items >> i;
item = reinterpret_cast<QTreeWidgetItem *> (i);

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My question: how check if the item readed and reinterpret from stream is already in memory (is not destroyed by another process in my program - my tree is dynamic playerlist and can be change by another playerlist)? "if (item)" is enough?