pub fn read(key: &[u8], value_out: &mut [u8], value_offset: u32) -> Option<u32>Expand description
Get key from storage, placing the value into value_out and return the number of
bytes that the entry in storage has beyond the offset or None if the storage entry
doesn’t exist at all.
If value_out length is smaller than the returned length, only value_out length bytes
are copied into value_out.