web service:Current file object

hi all,

Can anybody please tell me following things, I need them desparately,

1. How can I get complete path of currently opened pdf? (this.documentFileName returns only filename, not complete path)

2. How can I read the contents of currently opened pdf file so that I could get the Stream object to pass in MTOM web service?

In short, all I need to get an object which is comfortable as an attachment of web service.

Looking for the help....

Thanks in advance,

Vaibhav Kumar Arya