service use Record raw data

heweisheng commented 1 year ago

if wan't free data, need stop service

heweisheng commented 1 year ago

I found dns_sd.h

heweisheng commented 1 year ago

txtRecord: The TXT record rdata. A non-NULL txtRecord MUST be a properly formatted DNS
TXT record, i.e. ...
Passing NULL for the txtRecord is allowed as a synonym for txtLen=1, txtRecord="",
i.e. it creates a TXT record of length one containing a single empty string.
RFC 1035 doesn't allow a TXT record to contain zero strings, so a single empty
string is the smallest legal DNS TXT record.
As with the other parameters, the DNSServiceRegister call copies the txtRecord
data; e.g. if you allocated the storage for the txtRecord parameter with malloc()
then you can safely free that memory right after the DNSServiceRegister call returns.

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