--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancServer/Resources/Samples/Python/ChangesLoop.py	Wed Jun 10 20:30:34 2020 +0200
@@ -0,0 +1,87 @@
+#!/usr/bin/python
+
+# Orthanc - A Lightweight, RESTful DICOM Store
+# Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+# Department, University Hospital of Liege, Belgium
+# Copyright (C) 2017-2020 Osimis S.A., Belgium
+#
+# This program is free software: you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+
+
+import time
+import sys
+import RestToolbox
+
+
+##
+## Print help message
+##
+
+if len(sys.argv) != 3:
+    print("""
+Sample script that continuously monitors the arrival of new DICOM
+images into Orthanc (through the Changes API).
+
+Usage: %s [hostname] [HTTP port]
+For instance: %s 127.0.0.1 8042
+""" % (sys.argv[0], sys.argv[0]))
+    exit(-1)
+
+URL = 'http://%s:%d' % (sys.argv[1], int(sys.argv[2]))
+
+
+
+##
+## The following function is called each time a new instance is
+## received.
+##
+
+def NewInstanceReceived(path):
+    global URL
+    patientName = RestToolbox.DoGet(URL + path + '/content/PatientName')
+    
+    # Remove the possible trailing characters due to DICOM padding
+    patientName = patientName.strip()
+
+    print('New instance received for patient "%s": "%s"' % (patientName, path))
+
+
+
+##
+## Main loop that listens to the changes API.
+## 
+
+current = 0
+while True:
+    r = RestToolbox.DoGet(URL + '/changes', {
+            'since' : current,
+            'limit' : 4   # Retrieve at most 4 changes at once
+            })
+
+    for change in r['Changes']:
+        # We are only interested in the arrival of new instances
+        if change['ChangeType'] == 'NewInstance':
+            # Call the callback function
+            path = change['Path']
+            NewInstanceReceived(path)
+
+            # Delete the instance once it has been discovered
+            RestToolbox.DoDelete(URL + path)
+
+    current = r['Last']
+
+    if r['Done']:
+        print('Everything has been processed: Waiting...')
+        time.sleep(1)