Bonjour on Windows

Overview

• https://developer.apple.com/library/mac/documentation/Networking/Conceptual/dns_discovery_api/Articles/browse.html

• Install Bonjour64.msi.

From now there should be Bonjour Services automatically running at your comp.
You can install Bonjour SDK to see examples in several laguages.

• https://developer.apple.com/library/mac/documentation/Networking/Reference/DNSServiceDiscovery_CRef/#//apple_ref/c/func/

• Callbacks must be static, so any information you want to provide, use void* context parameter

• You can set several searchers. Then wait with select function until some answer is ready and call it with DNSServiceProcessResult(?), where ? is first parameter of searcher function or read (***) for other possibility.
• DNSServiceProcessResult inside run callback(s).

Basic searching consists of several steps:

• searcher  DNSServiceBrowse. if regtype == "_services._dns-sd._udp", it looks for all regtypes on network, otherwise it looks for instances of given regtype (in first case again call with one or more concrete regtypes)
• searcher DNSServiceResolve for resolve concrete instance
• searcher DNSServiceGetAddrInfo and DNSServiceQueryRecord

DNSServiceBrowse, DNSServiceQueryRecord usually runs indefinitely looking for change

do not forget DNSServiceRefDeallocate on DNSServiceRef given to DNSServiceResolve and DNSServiceGetAddrInfo.

• You need dns_sd.h and dnssd.lib

What is not clear at first glance

• DNSServiceProcessResult might run not only one, but several callbacks.
• err -65563 == kDNSServiceErr_ServiceNotRunning, Start Bonjour Service. It sometimes stop working.
• You have two possibilities (***):

1. DNSServiceRef client = NULL;
DNSServiceErrorType err = DNSServiceBrowse(&client,
And then use DNSServiceRefSockFD(client) for select function

2. DNSServiceErrorType err = DNSServiceCreateConnection(&clientDefault);
DNSServiceRef client = clientDefault;
DNSServiceErrorType err = DNSServiceBrowse(&client,
And then use DNSServiceRefSockFD(clientDefault) for select function
and so you can use client Default for many calls

• You will use sockets on windows:

There are two version of socket library: winsock2.h and winsock.h, first one want to use.

http://stackoverflow.com/questions/9153911/is-there-a-difference-between-winsock-h-and-winsock2-h
http://stackoverflow.com/questions/14094457/winsock-h-winsock2-h-which-to-use
https://msdn.microsoft.com/en-us/library/windows/desktop/ms737629(v=vs.85).aspx

#include<winsock2.h> before #include<windows.h> and also before #include<dns_sd.h> which includes windows.h

i.e.

#include <winsock2.h>
#include <ws2tcpip.h>
#include <Iphlpapi.h>
#include <process.h>

#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib, "Iphlpapi.lib")
#include <dns_sd.h>