Unfortunately, not at present, although GetAddrInfoEx () has placeholders for all the correct actions to work asynchronously through everything "(including IOCP), so I expect the end result ... Unfortunately, the docs are currently saying that they should all be set to NULL and marked as "reserved". :(
I'm about to write (it was some time) ... Unfortunately, WSAAsyncGetHostByNameit does not even allow simultaneous name resolution, so it is pretty useless as a base for what I want; but, again, since it does not handle IPv6, which also makes it useless to me. I expect to start from scratch; perhaps using something like this as a base (beer house).
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