How to receive the images / binary data t ype

How to receive the images / binary data type in webdynpro....

i have a website that let's the user send email, the email attachment and message are stored in both in images data type....

q1) can i stored the message into binary data type...but the message is very long.....

q2) if i have a textbox ...i surely will need to display the message in string ,right ?

[......... msg here ........]

what is the codes to receive the images / binary data type in webdynpro....