iOS Development UDP protocol send broadcast find device

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#import "AsyncUdpSocket.h"

#import <ifaddrs.h>

#import <arpa/inet.h>

Make a UDP request

-(void) makeudp

{

Instantiation of

Asyncudpsocket *socket=[[asyncudpsocket alloc]initwithdelegate:self];

Start the local port

[Socket LocalPort];

Nstimeinterval timeout=1000;//Send Timeout time

NSString *[email protected] "Dongqiangfei";//content sent to the server

NSData *data=[nsdata datawithdata:[request datausingencoding:nsasciistringencoding];

UInt16 port=6000;//Port

Nserror *error;

Send broadcast settings

[Socket Enablebroadcast:yes error:&error];

@ "10.10.60.255"

Change the final number of the target IP to 255 (meaning search All)

Nsarray *strarr=[[self getipaddress] componentsseparatedbystring:@ "."];

Nsmutablearray *muarr = [Nsmutablearray Arraywitharray:strarr];

[Muarr Replaceobjectatindex: (strarr.count-1) withobject:@ "255"];

NSString *finalstr = [Muarr componentsjoinedbystring:@ "."];/ /Destination IP

/*

Send Request

SendData: What to send

Tohost: IP of the target

Port: Port number

Timeout: Request timed out

*/

BOOL _isok = [socket senddata:d ata tohost:[nsstring stringwithformat:@ "%@", Finalstr] port:port withtimeout:timeout tag : 1];

if (_isok) {

UDP request Succeeded

}else{

UDP request failed

}

[Socket receivewithtimeout:1000 tag:0];//start receive thread-n? seconds timeout

NSLog (@ "start");

}

Receive information

-(BOOL) Onudpsocket: (Asyncudpsocket *) sock didreceivedata: (NSData *) data withtag: (long) tag fromhost: (NSString *) host Port: (UInt16) port{

nsstring* result;

result = [[NSString alloc] Initwithdata:data encoding:nsasciistringencoding];

NSLog (@ "%@", result);

NSLog (@ "%@", host);

NSLog (@ "received");

return NO;

}

Accept Failure

-(void) Onudpsocket: (Asyncudpsocket *) sock Didnotreceivedatawithtag: (long) tag duetoerror: (Nserror *) error{

NSLog (@ "not received ah");

}

Send failed

-(void) Onudpsocket: (Asyncudpsocket *) sock Didnotsenddatawithtag: (long) tag duetoerror: (Nserror *) error{

NSLog (@ "%@", error);

NSLog (@ "not sent Ah");

}

Start sending

-(void) Onudpsocket: (Asyncudpsocket *) sock Didsenddatawithtag: (long) tag{

NSLog (@ "send");

}

Turn off broadcast

-(void) Onudpsocketdidclose: (Asyncudpsocket *) sock{

NSLog (@ "off");

}

#pragma mark gets the current IP

-(NSString *) getipaddress {

NSString *address = @ "error";

struct Ifaddrs *interfaces = NULL;

struct Ifaddrs *temp_addr = NULL;

int success = 0;

Retrieve the current Interfaces-returns 0 on success

Success = Getifaddrs (&interfaces);

if (success = = 0) {

Loop through linked list of interfaces

TEMP_ADDR = interfaces;

while (temp_addr! = NULL) {

if (temp_addr->ifa_addr->sa_family = = af_inet) {

Check if interface is En0 which are the WiFi connection on the IPhone

if ([[[NSString Stringwithutf8string:temp_addr->ifa_name] isequaltostring:@ "En0"]) {

Get NSString from C String

address = [NSString stringwithutf8string:inet_ntoa ((struct sockaddr_in *) temp_addr->ifa_addr->sin_addr)];

}

}

TEMP_ADDR = temp_addr->ifa_next;

}

}

Free memory

Freeifaddrs (interfaces);

return address;

}

iOS Development UDP protocol send broadcast find device