[Zope-es] error con ejemplo de makethumbnail

[Federico Manuel Echeverri Choux]

Alexis Roda wrote:
> En/na Federico Manuel Echeverri Choux ha escrit:
>> Hola!! gente estoy estudiando los external method y me puse a hace el 
>> ejemplo que hace un thumbnail, pero cuando le doy add al method me 
>> dice esto:
>>
>> *Error Type: NameError*
>> *Error Value: name 'self' is not defined
>
> Utilizas self sin haberlo inicializado/declarado/definido previamente.
>
> Sin código que ver ni un traceback poco mas puedo decir.
>
>
>
>
> Saludos
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Este es el codigo que esta en el libro de zope

def makeThumbnail(self, original_id, size=200):
    """
    Makes a thumbnail image given an image Id when called on a Zope
    folder.

    The thumbnail is a Zope image object that is a small JPG
    representation of the original image. The thumbnail has an
    'original_id' property set to the id of the full size image
    object.
    """

    import PIL 
    from StringIO import StringIO
    import os.path 
    # none of the above imports would be allowed in Script (Python)!

    # Note that PIL.Image objects expect to get and save data
    # from the filesystem; so do Zope Images. We can get around 
    # this and do everything in memory by using StringIO.

    # Get the original image data in memory.
    original_image=getattr(self, original_id)
    original_file=StringIO(str(original_image.data))

    # create the thumbnail data in a new PIL Image. 
    image=PIL.Image.open(original_file)
    image=image.convert('RGB')
    image.thumbnail((size,size))

    # get the thumbnail data in memory.
    thumbnail_file=StringIO()
    image.save(thumbnail_file, "JPEG") 
    thumbnail_file.seek(0)

    # create an id for the thumbnail
    path, ext=os.path.splitext(original_id)
    thumbnail_id=path + '.thumb.jpg'

    # if there's an old thumbnail, delete it
    if thumbnail_id in self.objectIds():
        self.manage_delObjects([thumbnail_id])

    # create the Zope image object for the new thumbnail
    self.manage_addProduct['OFSP'].manage_addImage(thumbnail_id,
                                                   thumbnail_file,
                                                   'thumbnail image')

    # now find the new zope object so we can modify 
    # its properties.
    thumbnail_image=getattr(self, thumbnail_id)
    thumbnail_image.manage_addProperty('original_id', original_id, 'string')



	

	
		
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