Hi bliako, yes, you're right when assign the NULL value to the $device variable, yesterday I found a similar example from this site: http://sdr.f4gkr.org/trac/browser/gkSDR/Logiciel/rwhw/rtlsdr_iface.cpp?rev=9 which confirm also the idea of the status code (the correct return would be "0"). the initial idea was right but the return code is the same as before: 
device name 'Generic RTL2832U OEM'
SDR::RTLSDR::rtlsdr_open: dev is not of type RTLSDRDevice_TPtrPtr at s
+dr.pl line 13.

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Regards Edoardo M.

In reply to Re^2: help with XS pointers by Bpl
in thread help with XS pointers by Bpl

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