from gnuradio import gr,blocks
import pmt
import sys
from gnuradio.blocks import parse_file_metadata
import numpy as np

filename ='data.bin'
max_data_segments_to_read = 3
print_output = True
fh = open(filename, "rb")
for ii in range(max_data_segments_to_read):
    header_str = fh.read(parse_file_metadata.HEADER_LENGTH)
    header = pmt.deserialize_str(header_str)

    print(f"\n===Data segment {ii} ===")

    header_info = parse_file_metadata.parse_header(header, print_output)
    if(header_info["extra_len"] > 0):
        extra_str = fh.read(header_info["extra_len"])
        if(len(extra_str) != 0):
            extra = pmt.deserialize_str(extra_str)
            extra_info = parse_file_metadata.parse_extra_dict(extra, header_info, print_output)

    data=np.fromfile(file=fh, dtype=np.float32, count=int(header_info['nitems']), sep='', offset=0)
    print(f"{len(data)} data elements read")
fh.close()