[Zope-CMF] Problem adding Portal Images programatically

[Josef Albert Meile]

For the people interested, I solved the problem without using the 
invokeFactory method. I had just forgot some steps. This is the code:
from Products.CMFDefault import Image
from string import rfind,lower

def createImage(location,fileName,fileContent):
  #gets the fileName without its path
  pos=rfind(fileName,'\\')
  shortName=fileName[pos+1:len(fileName)]

  #gets its extension and determines its kind of file
  #I'm not sure if this is necessary, but it works
  pos=rfind(fileName,'.')
  extension=lower(fileName[pos+1:len(fileName)])
  if extension=='gif' or extension=='jpg' or extension=='jpeg' or 
extension=='bmp':
    fileFormat='image/'
    if extension=='jpg':
      fileFormat=fileFormat+'jpeg'
    else:
      fileFormat=fileFormat+extension
  else:
    fileFormat='text/html'

  #calls the method addImage from the class CMFDefault.Image
  Image.addImage(self=location,id=shortName,file=fileContent,  
                title=fileName,content_type='Image',format=fileFormat)
  
  #This is the part I had forgot

  #gets the created object and changes its PortalTypeName attribute
  #This ensures that you will be able to see it through the portal
  ob=location._getOb(shortName)
  if hasattr(ob, '_setPortalTypeName'):
    ob._setPortalTypeName('Image')

  #You have to do this if you want that this image appears on the 
  #catalog
  ob.reindexObject()

Notes:
- On my personal opinion the last step is useless because I think most
  people looks for information rather than images, and, if I am not
  wrong, as many objects as you have on your catalog, the search will
  be slower.
- location is a folder object, which on my case is the folder user. 
  I got it by calling the following lines:
  <dtml-let 
    user="portal_membership.getAuthenticatedMember().getUserName()"
    folderLocation="portal_membership.getHomeFolder(user)">
- fileName and fileContent were acquired from the following input on 
  my editForm:
  <input type="file" name="attachedImage">

  I put the following on my editDone form:
  <dtml-call 
    "REQUEST.set('fileContent',REQUEST.form['attachedImage'].read())">
  <dtml-call 
    "REQUEST.set('fileName',REQUEST.form['attachedImage'].filename)">

I hope that you find this useful.
Once more, thank you to Gregoire Weber for its valuable howTo, from 
which I took most of the code.