Configure MapProxy with isapi-wsgi

# WSGI module for use with Apache mod_wsgi

import os
from paste.deploy import loadapp

# this is not working
# application = loadapp('config:config.ini', relative_to=os.path.dirname(__file__))

# placing the path to the etc folder directly
application = loadapp('config:config.ini', relative_to="c:\\gis\\mapproxy_venv\\apvmapproxy\\etc")

#
# isapi-wsgi specific
# FROM http://code.google.com/docreader/#p=isapi-wsgi&s=isapi-wsgi&t=IntegrationWithDjango
#
import isapi_wsgi
# The entry points for the ISAPI extension.
def __ExtensionFactory__():
    return isapi_wsgi.ISAPISimpleHandler(application)

if __name__=='__main__':
    # If run from the command-line, install ourselves.
    from isapi.install import *
    params = ISAPIParameters()
    # Setup the virtual directories - this is a list of directories our
    # extension uses - in this case only 1.
    # Each extension has a "script map" - this is the mapping of ISAPI
    # extensions.
    sm = [
        ScriptMapParams(Extension="*", Flags=0)
    ]
    vd = VirtualDirParameters(Name="mapproxy",
                              Description = "ISAPI-WSGI ISAPISimpleHandler MapProxy",
                              ScriptMaps = sm,
                              ScriptMapUpdate = "replace"
                              )
    params.VirtualDirs = [vd]
    HandleCommandLine(params)