Hi monkers, in these days I was building an XS library, based on the librtlsdr library ( github link: https://github.com/librtlsdr/librtlsdr ) for now, some functions works fine but the "rtlsdr_open" call gives me some problems. For starting the code (from the github library) referred to the call is: 

RTLSDR_API int rtlsdr_open(rtlsdr_dev_t **dev, uint32_t index);

# where rtlsdr_dev_t is initialized as:

typedef struct rtlsdr_dev rtlsdr_dev_t;

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I think that my implementation of rtlsdr_dev is wrong, in the XS code I wrote 

int 
rtlsdr_open(dev, index)
  RTLSDRDevice_T **dev
  uint32_t index

# where RTLSDRDEVICE_T is

typedef  rtlsdr_dev_t  RTLSDRDevice_T;

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and from the TYPEMAP file the structure are declared as: 

RTLSDRDevice_T *    T_PTRREF
RTLSDRDevice_T **   T_PTRREF

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now, the problem is that, when I run this code: 

use SDR::RTLSDR qw(:all); # my library

my $serial_number = "00000001"; # from dmesg output

my $index = rtlsdr_get_index_by_serial( $serial_number ); # it returns
+ 0, this is not an error value so I think is good

my $device = rtlsdr_get_device_name( $index );
print rtlsdr_open( $device , $index)

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I have the following error: 

SDR::RTLSDR::rtlsdr_close: dev is not of type RTLSDRDevice_TPtr at sdr
+.pl line 7.

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Now, I think that the result is related to some pointer error but also with: 
print rtlsdr_open( \$device , $index)

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I had the same error code. hope in some helps Thanks Edoardo M.

In reply to help with XS pointers by Bpl

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