Returns the (possibly negative) integer represented by the eight bytes at
the specified byteOffset
in this object, in two's complement binary
form.
The return value will be between 263 and 263 - 1, inclusive.
Throws RangeError if byteOffset
is negative, or
byteOffset + 8
is greater than the length of this object.
Source
int getInt64(int byteOffset, [Endianness endian = Endianness.BIG_ENDIAN]);