[vtkusers] STl file is empty

[InfoSeekerr]

Dear all,
I write the following code to create mesh then write it to stl file, the
algorithm is: 

vtkDICOMImageReader then vtkContourFilter then vtkSmoothPolyDataFilter then
vtkPolyDataNormals then vtkStripper then vtkPolyDataConnectivityFilter (to
remove undisered parts ) then  vtkSTLWriter 

when open the stl file using notepad I just found those lines :
solid ascii
endsolid

which can't be read by other stl readers programs like maya 

any advice please 
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