iOS UDP multicast

These days in doing WiFi smart lights, need to use the knowledge of multicast to this record, the server is written in Java, the code is as follows:

1 Importjava.io.IOException;2 ImportJava.net.DatagramPacket;3 ImportJava.net.DatagramSocket;4 Importjava.net.InetAddress;5 ImportJava.net.MulticastSocket;6 7  classudpserver{8      Public Static voidMain (string[] args)throwsioexception{9MulticastSocket Server =NewMulticastSocket (5050);TenInetAddress address = Inetaddress.getbyname ("224.0.0.1"); One Server.joingroup (address); A          -          -         byte[] Recvbuf =New byte[100]; the Datagrampacket Recvpacket -=NewDatagrampacket (Recvbuf, recvbuf.length); -          -          while(true) +         { -          + server.receive (recvpacket); AString Recvstr =NewString (Recvpacket.getdata (), 0, Recvpacket.getlength ()); atSystem.out.println ("Hello world!" +recvstr); -         intPort =Recvpacket.getport (); -InetAddress addr = Inetaddress.getbyname ("224.0.0.1"); -String sendstr = "Hello!" I ' m Server "; -         byte[] sendbuf; -SendBuf =sendstr.getbytes (); in Datagrampacket Sendpacket -=NewDatagrampacket (SendBuf, sendbuf.length, addr, port); to server.send (sendpacket); +         } -       the          *          $     }Panax Notoginseng      -}

The main code on the iOS side:

1 #import "UdpHelper.h"2 3 @implementationUdphelper {4asyncudpsocket*M_udpsocket;5 }6 7+ (udphelper*) getinstance8 {9 Ten     Staticudphelper* Udphelper =Nil; One  A     Staticdispatch_once_t Oncetoken; -Dispatch_once (&oncetoken, ^{ -Udphelper =[[Self alloc] init]; the          - [Udphelper openudpserver]; -     }); -  +     returnUdphelper; - } +  A- (void) Openudpserver at { -asyncudpsocket* Tempsocket =[[Asyncudpsocket alloc] initwithdelegate:self]; -M_udpsocket =Tempsocket; -  -nserror* error =Nil; -[M_udpsocket Bindtoport:5051error:&ERROR]; in[M_udpsocket Joinmulticastgroup:@"224.0.0.1"error:&ERROR]; -  to[M_udpsocket receivewithtimeout:-1Tag0]; + } -  the- (void) SendMessage: (nsstring*) Message * { $nsmutablestring* sendstring = [nsmutablestring stringwithcapacity: -];Panax Notoginseng [sendstring appendstring:message]; -  theBOOL res =[M_udpsocket senddata:[sendstring datausingencoding:nsutf8stringencoding] +Tohost:@"224.0.0.1" APort5050 thewithtimeout:-1 +Tag0]; -  $NSLog (@"%@", sendstring); $     if(res) { -NSLog (@"xxxxffff"); -     } the     Else { -NSLog (@"Error");Wuyi     } the } -  Wu-(BOOL) Onudpsocket: (asyncudpsocket*) sock didreceivedata: (nsdata*) Data withtag: (Long) tag fromhost: (nsstring*) host port: (UInt16) Port - { AboutNSLog (@"Onudpsocket Successful"); $  -nsstring* str =[[NSString alloc] Initwithdata:data encoding:nsutf8stringencoding]; -  -NSLog (@"%@", str); A  +     returnYES; the } -  $- (void) Onudpsocket: (asyncudpsocket*) sock Didnotsenddatawithtag: (Long) tag Duetoerror: (nserror*) Error the { theNSLog (@"Error1"); the } the  -- (void) Onudpsocket: (asyncudpsocket*) sock Didnotreceivedatawithtag: (Long) tag Duetoerror: (nserror*) Error in { theNSLog (@"Error2"); the } About  the @end

The above code can be implemented on both ends of the message communication, the code is mainly reference to some other people's

iOS UDP multicast