django - pisa : adding images to PDF output

I got the images working. the code is as follows:

from django.http import HttpResponsefrom django.template.loader import render_to_stringfrom django.template import RequestContextfrom django.conf import settingsimport ho.pisa as pisaimport cStringIO as StringIOimport cgiimport osdef dm_monthly(request, year, month):    html  = render_to_string('reports/dmmonthly.html', { 'pagesize' : 'A4', }, context_instance=RequestContext(request))    result = StringIO.StringIO()    pdf = pisa.pisaDocument(StringIO.StringIO(html.encode("UTF-8")), dest=result, link_callback=fetch_resources )    if not pdf.err:        return HttpResponse(result.getvalue(), mimetype='application/pdf')    return HttpResponse('Gremlins ate your pdf! %s' % cgi.escape(html))def fetch_resources(uri, rel):    path = os.path.join(settings.MEDIA_ROOT, uri.replace(settings.MEDIA_URL, ""))    return path

This was taken liberally from http://groups.google.com/group/xhtml2pdf/browse_thread/thread/4cf4e5e0f4c99f55

I could not get images to appear despite trying every solution I could find on google. But this fudge worked for me as the command line version of pisa displays images ok:

    from tempfile import mkstemp    # write html to a temporary file    # can used NamedTemporaryFile if using python 2.6+    fid, fname = mkstemp(dir='/tmp')    f = open(fname, 'w+b')    f.write(html)    f.close()    # now create pdf from the html     cmd = 'xhtml2pdf "%s"' % fname    os.system(cmd)    os.unlink(fname)    # get the content of the pdf    filename = fname+'.pdf'    pdf = open(filename, 'r')    content = pdf.read()    pdf.close()    os.unlink(pdf.name)    # return content    response = HttpResponse(content, mimetype='application/pdf')    response['Content-Disposition'] = 'attachment; filename=draft.pdf'

This worked where the images had either a url or the full path name, eg.

<img src="/home/django/project/site_media/css/output/images/logo.jpg" /><img src="http://www.mysite.com/css/output/images/logo.jpg" />

def render_to_pdf( template_src, context_dict):    template = get_template(template_src)    context = Context(context_dict)    html  = template.render(context)    result = StringIO.StringIO()    if page has an image.something:        pdf = pisa.pisaDocument(StringIO.StringIO(html.encode("UTF-8")), dest=result, link_callback=fetch_resources)    else  no image.something :        pdf = pisa.pisaDocument(StringIO.StringIO(html.encode("UTF-8")),result)    if not pdf.err:        return HttpResponse(result.getvalue(), mimetype='examination_report/pdf')    return HttpResponse('We had some errors<pre>%s</pre>' % escape(html))def fetch_resources(uri, rel):    if os.sep == '\\': # deal with windows and wrong slashes        uri2 = os.sep.join(uri.split('/'))    else:# else, just add the untouched path.       uri2 = uri    path = '%s%s' % (settings.SITE_ROOT, uri2)    return path