问如何使用iOS SDK获取所有DNS记录

EN

DNSServiceErrorType DNSSD_API DNSServiceQueryRecord
    (
    DNSServiceRef                       *sdRef,
    DNSServiceFlags                     flags,
    uint32_t                            interfaceIndex,
    const char                          *fullname,
    uint16_t                            rrtype,
    uint16_t                            rrclass,
    DNSServiceQueryRecordReply          callBack,
    void                                *context  /* may be NULL */
    );

#include <dns_util.h>

// domain is a NSString
DNSServiceRef sdRef;
DNSServiceQueryRecord(&sdRef, 0, 0, [domain UTF8String], kDNSServiceType_MX, kDNSServiceClass_IN, callBack, NULL);
DNSServiceProcessResult(sdRef);
DNSServiceRefDeallocate(sdRef);

static void callBack(
                         DNSServiceRef       sdRef,
                         DNSServiceFlags     theFlags,
                         uint32_t            theInterfaceIndex,
                         DNSServiceErrorType theErrorCode,
                         const char*         theName,
                         uint16_t            theType,
                         uint16_t            theClass,
                         uint16_t            theDataLength,
                         const void*         theData,
                         uint32_t            theTTL,
                         void*               theContext)
{
    // do your magic here...
}