iOS_socket_switch

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1.AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]];    self.window.backgroundColor = [UIColor whiteColor];    ViewController *root = [[ViewController alloc]init];    self.window.rootViewController = root;    [self.window makeKeyAndVisible];        return YES;}

2.ViewController.h

#import <UIKit/UIKit.h>@interface ViewController : UIViewController{    Boolean link;    int fd;    Boolean conn;}@end

3.ViewController.m

#import "ViewController.h"#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    link = false;        UIButton *on = [UIButton buttonWithType:UIButtonTypeCustom];    on.frame = CGRectMake(50, 50, 200, 36);    on.backgroundColor = [UIColor blueColor];    [on setTitle:@"ON" forState:UIControlStateNormal];    [on addTarget:self action:@selector(turnON) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:on];        UIButton *off = [UIButton buttonWithType:UIButtonTypeCustom];    off.frame = CGRectMake(50, 100, 200, 36);    off.backgroundColor = [UIColor blueColor];    [off setTitle:@"OFF" forState:UIControlStateNormal];    [off addTarget:self action:@selector(turnOFF) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:off];}-(void) openSocket{    struct sockaddr_in addr;    if ((fd=socket(AF_INET, SOCK_STREAM, 0))!=-1) {        NSLog(@"socket success");        memset(&addr, 0, sizeof(addr));        addr.sin_len=sizeof(addr);        addr.sin_family=AF_INET;        addr.sin_addr.s_addr=INADDR_ANY;        if (bind(fd, (const struct sockaddr *)&addr, sizeof(addr))==0) {            struct sockaddr_in peeraddr;            memset(&peeraddr, 0, sizeof(peeraddr));            peeraddr.sin_len=sizeof(peeraddr);            peeraddr.sin_family=AF_INET;            peeraddr.sin_port=htons(9999);            peeraddr.sin_addr.s_addr=inet_addr("192.168.2.6");            socklen_t addrLen;            addrLen =sizeof(peeraddr);            conn = (connect(fd, (struct sockaddr *)&peeraddr, addrLen)==0);        }    }}-(void)turnON{    [self linkSocket];    if (conn) {        const char str[] = "on";        send(fd, str,sizeof(str)-1,0);    }else{        NSLog(@"connect failed");    }}-(void)turnOFF{    [self linkSocket];    if (conn) {        const char str[] = "off";        send(fd, str,sizeof(str)-1,0);    }else{        NSLog(@"connect failed");    }}-(void)linkSocket{    if (!link) {        [self openSocket];        link = true;    }}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

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