From cb9d910a0599cdb5a90f3c08c850c08c822d9073 Mon Sep 17 00:00:00 2001
From: James Teh <jamie@jantrid.net>
Date: Wed, 1 Apr 2020 04:52:01 +1000
Subject: [PATCH] Fix OSError exception after 5 seconds when calling
 pyia.Registry.start().

This is a bug in comtypes with Python 3: https://github.com/enthought/comtypes/issues/138
It's been fixed, but hasn't been released yet: https://github.com/enthought/comtypes/commit/36719c82
It doesn't seem like a release is coming any time soon, so rather than forcing pyia consumers to install comtypes from git, just work around it for now.
---
 pyia/registry.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/pyia/registry.py b/pyia/registry.py
index a522472..34e6bd4 100644
--- a/pyia/registry.py
+++ b/pyia/registry.py
@@ -32,6 +32,8 @@
 from event import Event
 from utils import accessibleObjectFromEvent
 
+RPC_S_CALLPENDING = -2147417835
+
 class Registry(object):
     def __init__(self):
         self.clients = {}
@@ -87,8 +89,15 @@ def clearListeners(self):
 
 
     def iter_loop(self, timeout=1):
-        PumpEvents(timeout)
-        
+        try:
+            PumpEvents(timeout)
+        except OSError as e:
+            # Work around https://github.com/enthought/comtypes/issues/138.
+            # RPC_S_CALLPENDING just means the timeout expired, so we can
+            # ignore it.
+            if e.winerror != RPC_S_CALLPENDING:
+                raise
+
     def start(self):
         while True:
             try: