Create ZIP files on the fly (See related posts)

    def createZIP(self, startdate, enddate):
        """ Create the XTG file and the photos in a ZIP file """
        from StringIO import StringIO
        xtgString = StringIO()
        photofiles = []
        zorionagurrak = self.getZorionAgurrak(startdate, enddate)

        xtgString.write('<v6.50><e0>\r')
        for zorionagurra in zorionagurrak:
            a = self.createZorionAgurraXTG(zorionagurra).getvalue()
            xtgString.write(a)
            photofiles.append((zorionagurra['id'], zorionagurra['photo']))
            
        zipfile = self.appendFiles(xtgString, photofiles)

        request = self.request

        request.response.setHeader('Content-Type', 'application/zip')
        request.response.setHeader('Content-Disposition', 'attachment; filename=zorionagurrak.zip')
        request.response.write(zipfile.getvalue())
        return request.response