dns_resolve_reverse_ipv6 Failed under Win7/Python2.7/VC2008

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```
What steps will reproduce the problem?

import event
import ipaddr # from http://code.google.com/p/ipaddr-py/
def myIPv6back(result, t, ttl, addrs, *args):
if( 0 != result):
print("Error looking up address.\n")
return False
if( type(addrs) == str):
print args,addrs
else:
for adds in addrs:
ip_int =0
for char in adds:
ip_int = (ip_int << 8) + ord(char) # Ag >
ip = ipaddr.IPv6Address(ip_int)
print ip
event.dns_resolve_reverse_ipv6(adds,0,myIPv6back,ip)
else:
print args,addrs

event.init()
event.dns_init()
#event.dns_resolve_ipv4("www.google.com",0,myIPv4back )
event.dns_resolve_ipv6("ipv6.google.com",0,myIPv6back, "ipv6.google.com")
event.dispatch()
event.dns_shutdown()

Error:
result = 3 ,addrs = None
```

Original issue reported on code.google.com by `jhong...@gmail.com` on 5 Sep 2011 at 2:52

Start with the supplied reproducer and its event.dns_init(), event.dns_resolve_ipv6(), and event.dns_resolve_reverse_ipv6() entry points. Trace the C implementation behind these calls on Win7 with Python 2.7 and VC2008, focusing on the reported result 3 and addrs=None. Done means the IPv6 lookup and reverse lookup complete successfully in the stated environment and the callback receives the expected address data.

Written by the indexing model from the issue text.