How to extract the image field content?

Hi, experts
I placed an image fields on an interactive form , user can upload jpg file into this field.
Could you pls tell me how to extract that using programming languages with the help of XML DOM?
I built a sample program that can retrive the content of the field, which is of type string, then when i save it to local drive, the image can not be displayed correctly.
could you pls tell me how to solve that?
br.
Jun

Jun,
Did you figure this out on your own? Any one out there have an answer?
Leti

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