document variable as input in webservice:

Hi,

  I have a process which works absolutely fine if I invoke it from Livecycle. It takes the document as input and decodes the barcode data and gives it as output. I tried to expose this process as a webservice. When we tried to call this webservice through external application, and giving a tiff image as input,

it generates premature end of file exception.

Do we need to make any changes to the input variable type (initially given as type document) or any specific settings to make this work through web service calls?

Please help.

Thanks,

kc