[Zope] want to use external script to read a text-file and image in database and modify REQUEST

[Allen Huang]

Hi
   
  I want to use external methods to read a text file and image in database and modify the REQUEST 
   
  my code looks like this varible 
  -----------------------
  def imageSetup(self, imageID, dataID, REQUEST):
    import PIL.Image
    from StringIO import StringIO
   
      # Get the original image and data in memory.
    image=getattr(self, imageID)
    imageData=getattr(self, dataID)
    imageFile=StringIO(str(image.data))
    imageDataFile=StringIO(str(imageData.data))
      # open image and data file
    im = PIL.Image.open(imageFile)
    tfw = open(imageDataFile, "r")
   
      # assign data coordinate and image size to variables
    imX,imY = im.size()
    rX=float(tfw.readline())
    tfw.readline()
    tfw.readline()
    rY=float(tfw.readline())
    mnX=float(tfw.readline())
    mnY=float(tfw.readline())
    mxX=mnX+imX*rX
    mxY=mnY+imY*rY
   
      # assign variables to REQUEST
    REQUEST.set('resX', rX)
    REQUEST.set('resY', rY)
    REQUEST.set('minX', mnX)
    REQUEST.set('minY', mnY)
    REQUEST.set('maxX', mxX)
    REQUEST.set('maxY', mxY)
    REQUEST.set('pixelX', imX)
    REQUEST.set('pixelY', imY)

  --------------------------------------
  but all I get is this
   
  zope coercing to Unicode: need string or buffer, instance found
   
  and the REQUEST variable is unchanged
   
  I'm still new to external scripting so I don't know what the problem is 
  (and I think there is a lot of it here)
   
  so, could someone help me out??

			
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