DCWorkflowGraph problem was already solved by external python package.

product/ERP5Type/ZopePatch.py

@@ -28,7 +28,6 @@ from Products.ERP5Type.patches import PropertyManager
 from Products.ERP5Type.patches import TM
 from Products.ERP5Type.patches import DA
 from Products.ERP5Type.patches import DCWorkflow
-from Products.ERP5Type.patches import DCWorkflowGraph
 from Products.ERP5Type.patches import Worklists
 from Products.ERP5Type.patches import BTreeFolder2
 from Products.ERP5Type.patches import WorkflowTool

product/ERP5Type/patches/DCWorkflowGraph.py

-#########################################################################
-# This code is taken from Products.DCWorkflowGraph-0.4-py2.6.egg
-# http://pypi.python.org/pypi/Products.DCWorkflowGraph
-# Author: panjunyong (panjy at zopen.cn, from ZOpen) <panjy at zopen cn>
-# License: ZPL 
-# The license term should be this one: http://www.zope.org/Resources/ZPL
-#########################################################################
-
-try:
-    from Products.DCWorkflowGraph import DCWorkflowGraph
-    from Products.DCWorkflowGraph.DCWorkflowGraph import (
-        getPOT, mktemp, os, bin_search, DOT_EXE)
-except ImportError:
-    DCWorkflowGraph = None
-
-if DCWorkflowGraph is not None:
-    def getGraph(self, wf_id="", format="gif", REQUEST=None):
-        """show a workflow as a graph, copy from:
-    "OpenFlowEditor":http://www.openflow.it/wwwopenflow/Download/OpenFlowEditor_0_4.tgz
-        """
-        pot = getPOT(self, wf_id, REQUEST)
-        encoding = 'utf-8' #### PATCHED
-        pot = pot.encode(encoding)
-        infile = mktemp('.dot')
-        f = open(infile, 'w')
-        f.write(pot)
-        f.close()
-
-        if REQUEST is None:
-            REQUEST = self.REQUEST
-        response = REQUEST.RESPONSE
-
-        if format != 'dot':
-            outfile = mktemp('.%s' % format)
-            os.system('%s -T%s -o %s %s' % (bin_search(DOT_EXE), format, outfile, infile))
-            out = open(outfile, 'rb')
-            result = out.read()
-            out.close()
-            os.remove(outfile)
-            response.setHeader('Content-Type', 'image/%s' % format)
-        else:
-            result = open(infile, 'r').read()
-            filename = wf_id or self.getId()
-            response.setHeader('Content-Type', 'text/x-graphviz')
-            response.setHeader('Content-Disposition',
-                               'attachment; filename=%s.dot' % filename)
-
-        os.remove(infile)
-        return result
-    from Products.DCWorkflow.DCWorkflow import DCWorkflowDefinition
-    DCWorkflowDefinition.getGraph = getGraph