"IOS" asynchronously resolves DNS

found that the iOS package is a bit disgusting, the select package into the form of Cfrunloop, and the Cfrunloop package into a nsrunloop, and select using the same way. And some convoluted concept, Af_unix encapsulated into the nsport.
The project encountered the need to resolve the problem of DNS asynchronous, the need to resolve DNS, another thread to cancel it, but not a single thread, and then force the end. Such an exit is not graceful.

Finally I wrote a DNS protocol with C ... Want to integrate into the socket cross-platform framework, and later found that I have no way to get DHCP to obtain the DNS server address.
Finally can only be implemented in the upper layer, using the cfnetwork.framework, through the label to cancel



#import @interface tshost:nsobject+ (Nsarray *) getipaddress: (NSString *) host Label: (NSString *) label;+ (void) Cancelparse: (NSString *) label; @end////tshost.m//dns_simple////Created by netriver on 14-5-30.//Copyright (c) 2014 onl Ywish.me. All rights reserved.//#import "TSHost.h" #include #include #include #include #include static Nsmutabledictionary *dic;void host_call_back (cfhostref thehost, Cfhostinfotype typeinfo, const CFStreamError *error, void *info) {} @implementation tshost+ (Nsarray *) getipaddress: (NSString *) host Label: (NSString *) label; {if (dic = = nil) {dic = [nsmutabledictionary dictionary];} if ([dic objectforkey:label]! = nil) {return nil;} Add Cancel interface Nsport *port = [Nsport port]; [DiC Setobject:port Forkey:label]; [[Nsrunloop Currentrunloop] addport:port formode:nsdefaultrunloopmode];//parsing the domain name code cfhostref hostref = Cfhostcreatewithname (NULL, (__bridge cfstringref) (host));//Set Asynchronous Cfhostclientcontext Context;memset (&context,0, sizeof (Cfhostclientcontext)); Cfhostsetclient (Hostref, Host_cAll_back, &context);//Add to Runloopcfhostschedulewithrunloop (Hostref,[[nsrunloop Currentrunloop] getCFRunLoop), Kcfrunloopdefaultmode); NSLog (@ "parsing .....");//Start parsing cfhoststartinforesolution (hostref,kcfhostaddresses,null);//wait for completion [[Nsrunloop Currentrunloop] Acceptinputformode:nsdefaultrunloopmode beforedate:[nsdate distantfuture]];// Cancel Run Loop Cfhostunschedulefromrunloop (Hostref, [[Nsrunloop Currentrunloop] getcfrunloop], kcfrunloopdefaultmode);// Remove cancellation interface [dic Removeobjectforkey:label]; [Port invalidate]; NSLog (@ "Parse complete ...."); Boolean flag;//Gets the resolved IP address Nsarray * array = (__bridge Nsarray *) cfhostgetaddressing (hostref, &flag);// Release the parsed object Cfrelease (HOSTREF); if (flag = = NO) return nil;struct sockaddr_in *sock_ptr; Nsmutablearray * result = [Nsmutablearray array];for (NSData * ipaddr in array) {sock_ptr = (struct-sockaddr_in *) [ipaddr by TES]; NSString * ip = [nsstring stringwithutf8string:inet_ntoa (SOCK_PTR->SIN_ADDR)]; [Result Addobject:ip]; NSLog (@ "IP =========%@", IP);} Cfrelease ((__bridge cftyperef) (array)); return result;} + (void) Cancelparse: (NSString *) label{if (dic = = nil) return; Nsport *theport = [dic objectforkey:label];if (Theport! = nil) {//Cancel run loop [theport sendbeforedate:[nsdate Date] Components: Nil From:nil reserved:0];}} @end

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"IOS" asynchronously resolves DNS