python msgs to stderr

floppies/franc/main.py

@@ -1,7 +1,8 @@
 #!/usr/bin/env python
 
+from __future__ import print_function
 import numpy as np
-import cv2, math
+import cv2, math, sys
 # import video
 from picamera.array import PiRGBArray
 from picamera import PiCamera
@@ -10,7 +11,8 @@ import OSC
 # from pythonosc import udp_client
 import time
 
-
+# MESSAGES NEED TO GO TO STDERR
+print ("1.HELLO FROM PYTHON stderr", file=sys.stderr)
 # def draw_flow(img, flow, step=4): # size grid 
 #     h, w = img.shape[:2]
 #     y, x = np.mgrid[step/2:h:step, step/2:w:step].reshape(2,-1)
@@ -45,7 +47,7 @@ def send_flow0(img, flow, step=4): # size grid
             dy = y2 - y1
             m = int(math.sqrt( (dx*dx) + (dy*dy) ))
             if m>2:
-                print ("dot", (normx, normy))
+                print ("dot", (normx, normy), file=sys.stderr)
                 msg = OSC.OSCMessage()
                 msg.setAddress("/dot")
                 #msg.append(dx)
@@ -53,7 +55,11 @@ def send_flow0(img, flow, step=4): # size grid
                 #msg.append(m)
                 msg.append(normx)
                 msg.append(normy)
-                client.send(msg)
+                try:
+                    client.send(msg)
+                except OSC.OSCClientError:
+                    print ("Unable to send OSC", file=sys.stderr)
+
             # client.send_message("/franc", m)
 
 
@@ -72,12 +78,13 @@ def send_flow0(img, flow, step=4): # size grid
     # cv2.rectangle(img, pt1, pt2, color[, thickness[, lineType[, shift]]])
 
 if __name__ == '__main__':
- 
+
     #data="hello"
     # client = udp_client.SimpleUDPClient("127.0.0.1", 9001)
 
     # connect camera
     # cam = video.create_capture("0:size=160x120") #canvas size in pixels
+    print ("Starting camera", file=sys.stderr)
     cam = PiCamera()
     framesize = (160, 128)
     cam.resolution = framesize
@@ -86,10 +93,17 @@ if __name__ == '__main__':
     # allow the camera to warmup
     time.sleep(0.25)
 
+    print ("Starting main camera loop", file=sys.stderr)
     # connect to pd
     # Init OSC
-    client = OSC.OSCClient()
+    while True:
-    client.connect(('127.0.0.1', 9001)) # first argument is the IP of the host, second argument is the port to use
+        try:
+                client = OSC.OSCClient()
+                client.connect(('127.0.0.1', 9001)) # first argument is the IP of the host, second argument is the port to use
+                break
+        except OSC.OSCClientError:
+            print ("Unable to connect via OSC to pd, trying again in 5", file=sys.stderr)
+            time.sleep(5)
 
     prevgray = None
     for frame in cam.capture_continuous(rawCapture, format="bgr", use_video_port=True):