Attaching PDF file to a CRM Activity

Hello guys,

I am a new CRM developer and I need advise on how to attach a PDF file to an activity...using CONVERT_OTF i managed to get my PDF in the form of a hexadecimal string...

after that i was told that i am suppose to attach the PDF to an activity using the following function module CRM_ICSS_UPLOAD_SR_ATTACHMENT....

I do not know how to do this because i am unsure of what to pass into the FM....

if anyone has done this before please help me out:)

sample code would be greatly appreciated to

Regards

Chun Wei