Class: FFI::Pointer

Inherits:
Object
  • Object
show all
Defined in:
lib/nwrfc/nwrfclib.rb

Instance Method Summary collapse

Instance Method Details

#read_string_dn(max = 0) ⇒ Object

Enhancement to FFI::Pointer to be able to read a double-null terminated string, which would be returned e.g. by RfcGetVersion() in the SDK See stackoverflow.com/questions/9293307/ruby-ffi-ruby-1-8-reading-utf-16le-encoded-strings It should be safe to call this on a Pointer within the context of the NW RFC SDK library, because all strings are supposed to be UTF-16LE encoded and double-null terminated



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# File 'lib/nwrfc/nwrfclib.rb', line 33

def read_string_dn(max=0)
  cont_nullcount = 0
  offset = 0
  until cont_nullcount == 2
    byte = get_bytes(offset,1)
    cont_nullcount += 1 if byte == "\000"
    cont_nullcount = 0 if byte != "\000"
    offset += 1
  end
  get_bytes(0,offset+1)
end