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【C】 socket编程
作者:ny5168 / 发布于2013/4/16/ 549
在xcode下的c语言编程

	服务端:
	//
	// main.m
	// server
	//
	// Created by mac on 13-4-15.
	// Copyright (c) 2013年 mac. All rights reserved.
	//

	#import <Foundation/Foundation.h>
	#import <sys/types.h>
	#import <sys/socket.h>
	#import <netinet/in.h>
	#import <arpa/inet.h>

	int CreateServerSocket(short port)
	{
	 int socket_server=0;
	 socket_server=socket(AF_INET,SOCK_STREAM,0);
	 //填充IP与端口
	 /*
	 struct sockaddr_in {
	 __uint8_t sin_len;
	 sa_family_t sin_family;
	 in_port_t sin_port;
	 struct in_addr sin_addr;
	 char sin_zero[8];
	 };
	 */
	 struct sockaddr_in sAddr = {0};
	 sAddr.sin_len=sizeof(sAddr);
	 sAddr.sin_family=AF_INET;
	 sAddr.sin_port= htons(port); //本机字节序转网络字节序
	 sAddr.sin_addr.s_addr=INADDR_ANY;
	 //绑定 //(struct sockaddr *)&sAddr强转
	 if (bind(socket_server, (struct sockaddr *)&sAddr, sizeof(sAddr)) != 0) {
	 return 0;
	 }
	 //监听
	 if(listen(socket_server, 100) != 0){
	 return 0;
	 }
	 return socket_server;
	}
	//接收连接并返回客户端的scoket
	int AcceptClientSocket(int ServerSocket)
	{
	 int ClinetSocket=0;
	 struct sockaddr_in cAddr = {0};
	 socklen_t len=sizeof(cAddr);
	 ClinetSocket = accept(ServerSocket, (struct sockaddr *)&cAddr, &len);
	 char * ipaddress=inet_ntoa(cAddr.sin_addr);
	 printf("accept--->%s,%d",ipaddress,cAddr.sin_port);
	 return ClinetSocket;
	}
	void Message(int socket)
	{
	 char send_Message[1024]="hello\n";
	 char recv_Message[1024]={0};
	 send(socket, send_Message, strlen(send_Message)+1, 0);
	 while (1) {
	 recv(socket, recv_Message, sizeof(recv_Message), 0);
	 printf("<-----%s",recv_Message);
	 printf("----->");
	 fgets(send_Message, sizeof(send_Message), stdin);
	 send(socket,send_Message,strlen(send_Message)+1,0);
	 }
	}

	int main(int argc, const char * argv[])
	{
	 short port=9898;
	 if (argc>1) {
	 port=(short)atoi(argv[1]);
	 }
	 int ServerSocket = CreateServerSocket(port);
	 if (ServerSocket == 0) {
	 printf("Cerate scoket error\n");
	 return 0;
	 }
	 printf("Cerate scoket ok!\n");
	
	 while (true)
	 {
	 int ClinetScoket=AcceptClientSocket(ServerSocket);
	 if (ClinetScoket == 0)
	 {
	 printf("Client connect error\n");
	 return 0;
	 }
	 printf("Client connect ok.....\n");
	 Message(ClinetScoket);
	 return 0;
	 }
	
	// //接收连接
	//// accept(<#int#>, <#struct sockaddr *restrict#>, <#socklen_t *restrict#>)
	// struct sockaddr sAdd2={0};
	// socklen_t len=sizeof(struct sockaddr);
	// accept(ServerSocket, &sAdd2, &len);
	
	 return 0;
	}

	客户端:
	//
	// main.m
	// client
	//
	// Created by mac on 13-4-15.
	// Copyright (c) 2013年 mac. All rights reserved.
	//

	#import <Foundation/Foundation.h>
	#import <sys/types.h>
	#import <sys/socket.h>
	#import <netinet/in.h>
	#import <arpa/inet.h>

	int CreateClinetSocket()
	{
	 int ClinetSocket = 0;
	 ClinetSocket = socket(AF_INET, SOCK_STREAM, 0);
	 return ClinetSocket;
	}
	int ConnectionToServer(int client_socket,const char * server_ip,unsigned short port)
	{
	 struct sockaddr_in sAddr={0};
	 sAddr.sin_len=sizeof(sAddr);
	 sAddr.sin_family=AF_INET;
	 inet_aton(server_ip, &sAddr.sin_addr);
	 sAddr.sin_port=htons(port);
	 if (connect(client_socket, (struct sockaddr *)&sAddr, sizeof(sAddr))==0) {
	 return client_socket;
	 }
	 return 0;
	}
	//client
	void Message(int socket)
	{
	 char send_Message[1024]="0";
	 char recv_Message[1024]={0};
	 while (1) {
	 recv(socket, recv_Message, sizeof(recv_Message), 0);
	 printf("<-----%s",recv_Message);
	 printf("----->");
	 fgets(send_Message, sizeof(send_Message), stdin);
	 send(socket,send_Message,strlen(send_Message)+1,0);
	 }
	}
	int main(int argc, const char * argv[])
	{
	 const char * server_ip="127.0.0.1";
	 short server_port=9898;
	 if (argc>1) {
	 server_ip = argv[1];
	 }
	 if (argc>2) {
	 server_port=(short)atoi(argv[2]);
	 }
	
	 int client_socket= CreateClinetSocket();
	 if (ConnectionToServer(client_socket,server_ip, server_port)==0) {
	 printf("Connect to server error\n");
	 return 0;
	 }
	 printf("Connect to server ok\n");
	 Message(client_socket);
	
	 return 0;
	}
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