modern C++ - fail to write

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how to keep pointer on the Data Writer ?

I have some class that hold pointer on the data writer. 

On my init function i fine the data writer by name - and i set the pointer to this data writer. 

Now, when i try to use this pointer -- i get exception that the writer is close. 

when i check the address value i see that its valid address and not null. 

what to do ? 

( code is modern C++ ) 

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