Image Streaming

Ian Bicking ianb at colorstudy.com
Wed Jul 9 17:38:04 CEST 2003


On Wed, 2003-07-09 at 09:22, Steffen Brodowski wrote:
> > have that function return the image object.  Then, assuming you are
> > doing this in CGI (easily adapted if not), do something like (untested):
> > 
> > import sys
> > image = CreateBarCode(...)
> > print 'Content-type: image/jpeg\n'
> > image.save(sys.stdout, 'JPEG')
> 
> 
> I think its more difficult.
> 
> The function CreateBarcode has to return the image directly.
> Additional you have to know, that I have to implement it into Zope. So
> I use the script as an "external method".  Modulname=Barcode,
> functionname=CreateBarcode.
> 
> I'm using the following line in Zope DTML
> <dtml-var "barcode(SourceString='123456789',Linewidth=1,WriteText=0)">

So then you don't want to stream it.  You might do something like:

from cStringIO import StringIO
def CreateBarcode(...):
    # create image object
    output = StringIO()
    image.save(output, 'GIF')
    return output.getvalue()








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