服務端：

#import "ViewController.h"#import <sys/socket.h> #import <netdb.h>@interface ViewController ()@end#define SOCKET int #define INVALID_SOCKET -1 #define SOCKET_ERROR -1@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.SOCKET Socket_Client;//創建 socketSocket_Client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (Socket_Client == INVALID_SOCKET){printf("socket error");return;}struct sockaddr_in sockaddr;//初始化地址信息sockaddr.sin_family = AF_INET;sockaddr.sin_port = htons(8000); //8000端口sockaddr.sin_addr.s_addr = INADDR_ANY; //表示所有可用的地址//綁定 socketif (bind(Socket_Client,(struct sockaddr*)&sockaddr,sizeof(sockaddr)) == SOCKET_ERROR){printf("bind error");return;}//監聽if (listen(Socket_Client,5) == SOCKET_ERROR){printf("listen error");return;}SOCKET Socket_Server; //客戶端struct sockaddr_in remoteAddr; //服務端地址int Addrlen = sizeof(remoteAddr);char revData[255];while (true){//接收連接Socket_Server = accept(Socket_Client,(struct sockaddr*)&remoteAddr,&Addrlen);if (Socket_Client == INVALID_SOCKET){printf("accept error");continue;}printf("連接成功");//接收數據int ret = recv(Socket_Server,revData,sizeof(revData),0);if (ret > 0){printf("recv: %s",revData);}}close(Socket_Server); //關閉socket }
客戶端：

#import "ViewController.h"#import <sys/socket.h> #import <netdb.h> #import <arpa/inet.h>#define SOCKET int #define INVALID_SOCKET -1@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//創建SocketSOCKET Socket_Server;Socket_Server = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);if (Socket_Server == INVALID_SOCKET){printf("Socket error");return;}//初始化地址struct sockaddr_in ClientAddr;ClientAddr.sin_family = AF_INET;ClientAddr.sin_port = htons(8000);ClientAddr.sin_addr.s_addr = inet_addr("192.168.4.107");//循環連接while (true){//連接if (connect(Socket_Server,(struct sockaddr*)&ClientAddr,sizeof(ClientAddr)) < 0){printf("connect error\n");sleep(3);continue;}printf("連接成功");break;}//發送if (send(Socket_Server,"上線了",sizeof("上線了"),0) < 0){printf("send error");return;}//關閉Socketclose(Socket_Server);// Do any additional setup after loading the view, typically from a nib. }

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