Implementation of IOS using socket UDP protocol broadcasting mechanism

Last Update:2015-07-17 Source: Internet

Author: User

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1. PrefaceWhat is the UDP Protocol broadcast mechanism?Take an example, for example, in a group of people, a person to find Zhang san, so you shout to the crowd ( broadcast ):" who is Zhang San "If it is Zhang san, it will respond to you, and it is the same in the Network. Application Scenarios for UDP broadcast mechanism:A number of clients, in the LAN ( do not know the case of IP ) need to find a number of devices unique equipment, such as the server, or a printer, fax machines and so On.Let's say I'm now ready to install the server on an IPad that never loses power.A number of clients IPhone is activated, it is necessary to broadcast to all devices, who is the server, the server, please tell me the IP address. Then I went to connect and then entered the long connection and received the message Backstage.2.implementation ofUDP broadcast mechanismNote:iPad: server-side iPhone: Client 2.1 . Server-side (IPad) implementationsInitialize UDPAsyncudpsocket *asyncudpsocket = [[asyncudpsocket alloc] initwithdelegate:self];// bound portnserror *err =nil;[asyncudpsocket enablebroadcast:YES error:&err];[asyncudpsocket bindtoport:9527 error:&err];// start the receive thread[asyncudpsocket receivewithtimeout:-1 tag:0]; 2.1.1 . Implementing Proxy methods// received a message-(BOOL) onudpsocket: (asyncudpsocket *) sock didreceivedata: (nsdata *) data withtag: (long) Tag fromhost: (nsstring *) host port: (UInt16) port{if (data is for the server ) { //based on the IP given by the client, the communication can be started by using TCP or UDP to connect to each other. 　　　　　　}　　returnYES;}// did not receive the message-(void) onudpsocket: (asyncudpsocket *) sock didnotreceivedatawithtag: (long) tag duetoerror: ( Nserror *) error{}// did not send out a message-(void) onudpsocket: (asyncudpsocket *) sock didnotsenddatawithtag: (long) tag duetoerror: ( Nserror *) error{}// sent out message-(void) onudpsocket: (asyncudpsocket *) sock didsenddatawithtag: (long) tag{}// Disconnect-(void) onudpsocketdidclose: (asyncudpsocket *) sock{} 2.2. The implementation of the client (iPhone)Note: The implementation steps are similar to the server side//InitializeUDP Asyncudpsocket *asyncudpsocket = [[asyncudpsocket alloc] initwithdelegate:self];// Binding Port nserror *err =nil;[asyncudpsocket enablebroadcast:YES error:&err];[asyncudpsocket bindtoport:9527 error:&err]; 2.2.1. Implementing Proxy Methods// received a message-(BOOL) onudpsocket: (asyncudpsocket *) sock didreceivedata: (nsdata *) data withtag: (long) Tag fromhost: (nsstring *) host port: (UInt16) port{returnYES ; 　}// did not receive the message-(void) onudpsocket: (asyncudpsocket *) sock didnotreceivedatawithtag: (long) tag duetoerror: ( Nserror *) error{}// did not send out a message-(void) onudpsocket: (asyncudpsocket *) sock didnotsenddatawithtag: (long) tag duetoerror: ( Nserror *) error{}// sent out message-(void) onudpsocket: (asyncudpsocket *) sock didsenddatawithtag: (long) tag{}// Disconnect-(void) onudpsocketdidclose: (asyncudpsocket *) sock{} 2.2.2. Radio Searchnote: Broadcast IP address is 255.255.255.255NSString *str = @ " who is the server?" My IP is:192.168.80.103 ";NSData *data=[str datausingencoding:nsutf8stringencoding];[asyncudpsocket senddata:data tohost:@ "255.255.255.255" port:9527 withtimeout:-1 tag: 0]; Copyright Notice: This article for Bo Master original article, without Bo Master permission not Reproduced. Implementation of IOS using socket UDP protocol broadcasting mechanism

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Implementation of IOS using socket UDP protocol broadcasting mechanism

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