Advertise service with Bonjour on Windows

Answer 1

Are you compiling it againt dnssd.dll?

Have you tried using C:\Windows\system32\dns-sd.exe instead? At least as a debugging tool?

Is mDNSResponder (the Bonjour Service) running? Many people disable it.

Also the problem could be between your PC and the iPhone, check if the service is advertised correctly on your PC, with Safari, the BonjourFoxy Firefox Extension or the Bonjour SDK

I also posted a couple of links to Apple documentation (the dns-sd and dnssd.dll/dylib manpages) in another answer.