Reads in an 64-bit value from the specified memory space and offset.

    Corresponds to viIn64* function of the VISA library.

    :param library: the visa library wrapped by ctypes.
    :param session: Unique logical identifier to a session.
    :param space: Specifies the address space. (Constants.*SPACE*)
    :param offset: Offset (in bytes) of the address or register from which to read.
    :param extended: Use 64 bits offset independent of the platform.
    :return: Data read from memory, return value of the library call.
    :rtype: int, :class:`pyvisa.constants.StatusCode`

def in_64(library, session, space, offset, extended=False):
    """Reads in an 64-bit value from the specified memory space and offset.

    Corresponds to viIn64* function of the VISA library.

    :param library: the visa library wrapped by ctypes.
    :param session: Unique logical identifier to a session.
    :param space: Specifies the address space. (Constants.*SPACE*)
    :param offset: Offset (in bytes) of the address or register from which to read.
    :param extended: Use 64 bits offset independent of the platform.
    :return: Data read from memory, return value of the library call.
    :rtype: int, :class:`pyvisa.constants.StatusCode`
    """
    value_64 = ViUInt64()
    if extended:
        ret = library.viIn64Ex(session, space, offset, byref(value_64))
    else:
        ret = library.viIn64(session, space, offset, byref(value_64))
    return value_64.value, ret