[mod_python] Re: Mike's psp upload

hello all,
 I am also trying to implement file upload functionality with psp. I didn't get the use of callback function. 
I am able to access the data of uploaded file with following code.

frm = util.FieldStorage(req)
for afile in frm.getlist('UploadFile'):
    filedata = afile.file.read()
    #write filedata to some file in local directory with name afile.filename.

can someone explain me..what is the need of this callback function? also how it works?


Thanks 
Sandip 

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