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.
int getInt64(int byteOffset, [Endian endian = Endian.big]);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.