File.read_int64

Reads the next eight bytes from this File object and returns it as a 64-bit integer Number object. The value is read from the zero-based File.pos position. File.pos is then incremented by 8. If this File object is invalid then the getter returns Nothing.

var f = File("/Users/garry/Desktop/test.txt")
f.read_int64 # E.g: 5216694956355246080