Ok, I found out that the function I really want to runs is this:
DNSServiceErrorType DNSSD_API DNSServiceBrowse
(
DNSServiceRef *sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
const char *regtype,
const char *domain, /* may be NULL */
DNSServiceBrowseReply callBack,
void *context /* may be NULL */
);
Things that confuse me:
(a) renamed standard types
DNSServiceBrowseReply is defined as "int32", squeak calls that "long".
So I did this: subclassing "ExternalType", overwriting new and inserting ^ self long
(b) DNSServiceBrowseReply - the callback
I'm supposed to give a function where I'll be called back when the result is there, so as you see DNSServiceBrowse is non-blocking - no idea what the Squeak VM does when suddenly a dll knocks on its door without using a semaphore (how could I?)
(c) How to point to a callback function? Does this finally mean I need to drop FFI and write an external plugin?
The Callback function is supposed to have this shape:
typedef void (DNSSD_API *DNSServiceBrowseReply)
(
DNSServiceRef sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
DNSServiceErrorType errorCode,
const char *serviceName,
const char *regtype,
const char *replyDomain,
void *context
);
Note that DNSSD_API is not defined anywhere (seems to be C coding tradition or something like that, wonder how c compilers react to that).
But I doubt that the dll can find that function inside squeak, can it? And if so - how to "declare" it? ExternalFunction seems to be rather made to reference *existing* dll-methods rather than creating "virtual" new ones.
niko
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