【Echo】实验 -- 实现 C/C++下UDP, 服务器/客户端 通讯
本次实验利用UDP协议, 语言环境为 C/C++
利用套接字Socket编程,实现Server/CLient 之间简单的通讯。
结果应为类似所示:
下面贴上代码(参考参考...)
Server 部分:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 /* UDPServer.cpp */ 2 3 #include <stdlib.h> 4 #include <stdio.h> 5 #include <winsock2.h> 6 #include <string.h> 7 #include "conio.h" 8 #include <time.h> 9 10 #define BUFLEN 2000 // 缓冲区大小 11 #define WSVERS MAKEWORD(2, 2) // 指明版本2.2 12 #pragma comment(lib,"ws2_32.lib") // 加载winsock 2.2 Llibrary 13 14 /*------------------------------------------------------------------------ 15 * main - TCP client for DAYTIME service 16 *------------------------------------------------------------------------ 17 */ 18 void 19 main(int argc, char *argv[]) 20 { 21 char *host = "127.0.0.1"; /* server IP Address to connect */ 22 23 char *service = "5050"; /* server port to connect */ 24 struct sockaddr_in sin; /* an Internet endpoint address */ 25 struct sockaddr_in from; /* sender address */ 26 int fromsize = sizeof(from); 27 char buf[BUFLEN+1]; /* buffer for one line of text */ 28 char buf1[BUFLEN+1]; 29 SOCKET sock; /* socket descriptor */ 30 int cc; /* recv character count */ 31 32 char *pts; 33 time_t now; 34 35 WSADATA wsadata; 36 WSAStartup(WSVERS, &wsadata); /* 加载winsock library,WSVERS为请求版本,wsadata返回系统实际支持的最高版本。 */ 37 sock = socket(PF_INET, SOCK_DGRAM,IPPROTO_UDP); // 创建UDP套接字, 参数:因特网协议簇(family),数据报套接字,UDP协议号, 返回:要监听套接字的描述符或INVALID_SOCKET 38 memset(&sin, 0, sizeof(sin)); 39 sin.sin_family = AF_INET; 40 sin.sin_addr.s_addr = INADDR_ANY; // 绑定(监听)所有的接口。 41 sin.sin_port = htons((u_short)atoi(service)); // 绑定指定接口。atoi--把ascii转化为int,htons -- 主机序(host)转化为网络序(network), 为short类型。 42 bind(sock, (struct sockaddr *)&sin, sizeof(sin)); // 绑定本地端口号(和本地IP地址) 43 44 (void) time(&now); // 取得系统时间 45 pts = ctime(&now); // 把时间转换为字符串 46 printf(" \t UDP(Server) Echo增强程序\n\n"); 47 while(!_kbhit()){ //检测是否有按键 48 flag1: cc = recvfrom(sock, buf, BUFLEN, 0, (SOCKADDR *)&from, &fromsize); //接收客户数据。返回结果:cc为接收的字符数,from中将包含客户IP地址和端口号。 49 sprintf(buf1," \t\t 时间: %s \t\t Client【IP: %s 端口号: %d 】\n \t\t 数据: %s",pts,inet_ntoa(from.sin_addr),from.sin_port,buf); 50 if (cc == SOCKET_ERROR){ 51 printf("recvfrom() failed; %d\n", WSAGetLastError()); 52 break; 53 } 54 else if (cc == 0) 55 break; 56 else{ 57 buf[cc] = '\0'; 58 printf("您收到的数据为:\n %s\n", buf1); 59 printf("将自动把此数据返回给 Client \n"); 60 goto flag2; 61 } 62 63 } 64 65 flag2: cc = sendto(sock, buf1, 1000, 0,(SOCKADDR *)&from, sizeof(from)); 66 if (cc == SOCKET_ERROR){ 67 printf("发送失败,错误号:%d\n", WSAGetLastError()); 68 } 69 else{ 70 printf("发送成功\n"); 71 goto flag1; 72 } 73 74 // cc = recvfrom(sock, buf, BUFLEN, 0, (SOCKADDR *)&from, &fromsize); 75 76 closesocket(sock); 77 GlobalFree(buf); 78 WSACleanup(); /* 卸载某版本的DLL */ 79 }
Client 部分:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 /* UDPClient.cpp */ 2 3 #include <stdlib.h> 4 #include <stdio.h> 5 #include <winsock2.h> 6 #include <string.h> 7 #include <time.h> 8 9 #define BUFLEN 2000 // 缓冲区大小 10 #define WSVERS MAKEWORD(2, 2) // 指明版本2.2 11 #pragma comment(lib,"ws2_32.lib") // 加载winsock 2.2 Llibrary 12 13 void 14 main(int argc, char *argv[]) 15 { 16 char *host = "127.0.0.1"; /* server IP to connect */ 17 18 char *service = "5050"; /* server port to connect */ 19 struct sockaddr_in toAddr; /* an Internet endpoint address */ 20 char buf[BUFLEN+1]; /* buffer for one line of text */ 21 SOCKET sock; /* socket descriptor */ 22 int cc; /* recv character count */ 23 char *pts; /* pointer to time string */ 24 time_t now; /* current time */ 25 26 int toAddrsize = sizeof(toAddr); 27 28 WSADATA wsadata; 29 WSAStartup(WSVERS, &wsadata); /* 启动某版本Socket的DLL */ 30 31 sock = socket(PF_INET, SOCK_DGRAM,IPPROTO_UDP); 32 33 memset(&toAddr, 0, sizeof(toAddr)); 34 toAddr.sin_family = AF_INET; 35 toAddr.sin_port = htons((u_short)atoi(service)); //atoi:把ascii转化为int. htons:主机序(host)转化为网络序(network), s--short 36 toAddr.sin_addr.s_addr = inet_addr(host); //如果host为域名,需要先用函数gethostbyname把域名转化为IP地址 37 38 39 // memset(buf,' ',1000); //fill 1000 bytes with 'e' 40 buf[1000] = '\0'; 41 (void) time(&now); // 取得系统时间 42 pts = ctime(&now); // 把时间转换为字符串 43 // memcpy(buf,pts,strlen(pts)); 44 sprintf(buf,"%s ",pts); 45 printf(" UDP(Client) Echo增强程序\n\n"); 46 printf(" 时间 :%s",buf); 47 48 49 50 cc = sendto(sock, buf, 1000, 0,(SOCKADDR *)&toAddr, sizeof(toAddr)); 51 flag2: if (cc == SOCKET_ERROR){ 52 printf("发送失败,错误号:%d\n", WSAGetLastError()); 53 } 54 else{ 55 printf(" 发送成功 \n"); 56 cc = recvfrom(sock, buf, BUFLEN, 0, (SOCKADDR *)&toAddr, & toAddrsize); 57 printf(" 您接收到的数据为:\n %s \n",buf); 58 printf("键入 # 继续发送,键入 @ 停止发送\n"); 59 scanf("%s",pts); 60 if(pts[0]=='#') 61 { 62 printf(" 请输入要发送的数据 :\n"); 63 goto flag1; 64 } 65 if(pts[0]=='@') 66 goto end; 67 68 69 } 70 71 flag1: 72 scanf("%s",pts); 73 sprintf(buf,"%s ",pts); 74 cc = sendto(sock, buf, 1000, 0,(SOCKADDR *)&toAddr, sizeof(toAddr)); 75 76 goto flag2; 77 78 79 80 getchar(); 81 82 closesocket(sock); 83 84 end: GlobalFree(buf); 85 WSACleanup(); /* 卸载某版本的DLL */ 86 87 getchar(); 88 89 }
[-_-]眼睛累了吧,注意劳逸结合呀[-_-]