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代码链接 http://i.cnblogs.com/EditPosts.aspx?opt=1
#import "AsyncUdpSocket.h"
#import <ifaddrs.h>
#import <arpa/inet.h>
//做udp 请求
-(void)MakeUDP
{
//实例化
AsyncUdpSocket *socket=[[AsyncUdpSocket alloc]initWithDelegate:self];
//启动本地端口
[socket localPort];
NSTimeInterval timeout=1000;//发送超时时间
NSString *request=@"dongqiangfei";//发送给服务器的内容
NSData *data=[NSData dataWithData:[request dataUsingEncoding:NSASCIIStringEncoding] ];
UInt16 port=6000;//端口
NSError *error;
//发送广播设置
[socket enableBroadcast:YES error:&error];
//@"10.10.60.255"
//把得到的目标ip 最后的数字更换为255（意思是搜索全部的）
NSArray *strArr=[[self getIPAddress] componentsSeparatedByString:@"."];
NSMutableArray *muArr = [NSMutableArray arrayWithArray:strArr];
[muArr replaceObjectAtIndex:(strArr.count-1) withObject:@"255"];
NSString *finalStr = [muArr componentsJoinedByString:@"."];//目标ip
/*
发送请求
sendData:发送的内容
toHost:目标的ip
port:端口号
timeOut:请求超时
*/
BOOL _isOK = [socket sendData :data toHost:[NSString stringWithFormat:@"%@",finalStr] port:port withTimeout:timeout tag:1];
if (_isOK) {
//udp请求成功
}else{
//udp请求失败
}
[socket receiveWithTimeout:1000 tag:0];//启动接收线程 - n?秒超时
NSLog(@"开始啦");
}
//接受信息
- (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(@"收到啦");
return NO;
}
//接受失败
-(void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error{
NSLog(@"没有收到啊 ");
}
//发送失败
-(void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error{
NSLog(@"%@",error);
NSLog(@"没有发送啊");
}
//开始发送
-(void)onUdpSocket:(AsyncUdpSocket *)sock didSendDataWithTag:(long)tag{
NSLog(@"发送啦");
}
//关闭广播
-(void)onUdpSocketDidClose:(AsyncUdpSocket *)sock{
NSLog(@"关闭啦");
}
#pragma mark 获取当前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 is 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;
}
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原文地址：http://www.cnblogs.com/godlovexq/p/5209270.html
