questions about ECC encryption

[Xinwen Fu]

Hi,
        I have little knowledge about ECC encryption, but very
interested in it.
        Can somebody explain some simple questions to me about ECIES (ECC
used as public key encryption method)

1. Given an ECC key of size 256 bytes, and a plaintext of size 256 bytes,
what is the size of the ciphertext block after using ECIES?

2. Is there any example of using ECIES? Generation of keys of different
size? Encryption of plaintext?

        Thanks in advance!

Xinwen Fu