原文作者：aircraft
原文地址：https://www.cnblogs.com/DOMLX/p/9601511.html
c++ 网络编程（一）TCP/UDP 入门级客户端与服务端交互代码
windows下：
TCP：
一.服务端代码
#define _WINSOCK_DEPRECATED_NO_WARNINGS#include#include #include #pragma comment(lib, "ws2_32.lib")void main() { WSADATA wsaData; int port = 5099; char buf[] = "Server: hello, I am a server....."; if (WSAStartup(MAKEWORd(2, 2), &wsaData) != 0) { printf("Failed to load Winsock"); return; } //创建用于监听的套接字 SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(port); //1024以上的端口号 addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN)); if (retVal == SOCKET_ERROR){ printf("Failed bind:%dn", WSAGetLastError()); return; } if (listen(sockSrv, 10) == SOCKET_ERROR){ printf("Listen failed:%d", WSAGetLastError()); return; } SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR);//等待客户请求到来 SOCKET sockConn = accept(sockSrv, (SOCKADDR *)&addrClient, &len); if (sockConn == SOCKET_ERROR){ printf("Accept failed:%d", WSAGetLastError()); //break; } printf("Accept client IP:[%s]n", inet_ntoa(addrClient.sin_addr)); //发送数据 int iSend = send(sockConn, buf, sizeof(buf), 0); if (iSend == SOCKET_ERROR){ printf("send failed"); // break; } char recvBuf[100]; memset(recvBuf, 0, sizeof(recvBuf)); // //接收数据 recv(sockConn, recvBuf, sizeof(recvBuf), 0); printf("%sn", recvBuf); closesocket(sockConn); closesocket(sockSrv); WSACleanup(); system("pause"); }
二.客户端代码
#define _WINSOCK_DEPRECATED_NO_WARNINGS#include#include #pragma comment(lib, "ws2_32.lib")void main() { //加载套接字 WSADATA wsaData; char buff[1024]; memset(buff, 0, sizeof(buff)); if (WSAStartup(MAKEWORd(2, 2), &wsaData) != 0) { printf("Failed to load Winsock"); return; } SOCKADDR_IN addrSrv; addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons(5099); addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //创建套接字 SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0); if (SOCKET_ERROR == sockClient){ printf("Socket() error:%d", WSAGetLastError()); return; } //向服务器发出连接请求 if (connect(sockClient, (struct sockaddr*)&addrSrv, sizeof(addrSrv)) == INVALID_SOCKET){ printf("Connect failed:%d", WSAGetLastError()); return; } else { //接收数据 recv(sockClient, buff, sizeof(buff), 0); printf("%sn", buff); } //发送数据 char *buffSend = "hello, this is a Client...."; send(sockClient, buffSend, strlen(buffSend) + 1, 0); printf("%d", strlen(buffSend) + 1); //关闭套接字 closesocket(sockClient); WSACleanup(); system("pause"); }
怕某些小白不懂我详细说说运行，运行时先开服务端，在开客户端运行 ，也就是开两个cPP文件分别运行，两个cpp各是一个小项目代码 不要放在一起
这里的127.0.0.1是代表本地的地址，你们想实现两机交互就用对方的地址。
代码很简单，想要直接拿去，接下来直接看运行结果：
UDP：
windows下UDP服务端代码
?
| #include |
windows下UDP客户端端代码
#include#include #include #include using namespace std;#pragma comment(lib,"ws2_32.lib")# define BUFFER_SIZE 1024 //缓冲区大小int main() { SOCKET sock_Client; //客户端用于通信的Socket WSADATA WSAData; char receBuf[BUFFER_SIZE]; //发送数据的缓冲区 char sendBuf[BUFFER_SIZE]; //接受数据的缓冲区 if (WSAStartup(MAKEWORd(2, 2), &WSAData) != 0) { printf("初始化失败!"); return -1; } //初始化 sock_Client = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);//创建客户端用于通信的Socket SOCKADDR_IN addr_server; //服务器的地址数据结构 addr_server.sin_family = AF_INET; addr_server.sin_port = htons(4567);//端口号为4567 addr_server.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //127.0.0.1为本电脑IP地址 SOCKADDR_IN sock; int len = sizeof(sock); while (true) { cout << "请输入要传送的数据:"; cin >> sendBuf; sendto(sock_Client, sendBuf, strlen(sendBuf), 0, (SOCKADDR*)&addr_server, sizeof(SOCKADDR)); //int last=recv(sock_Client, receBuf, strlen(receBuf), 0); // (调用recv和recvfrom都可以) int last = recvfrom(sock_Client, receBuf, strlen(receBuf), 0, (SOCKADDR*)&sock, &len); if (last>0) { receBuf[last] = ' '; //给字符数组加一个' '，表示结束了。不然输出有乱码 if (strcmp(receBuf, "bye") == 0) { cout << "服务器不跟我聊天了..." << endl;//当服务器发来bye时，关闭socket closesocket(sock_Client); break; } else { printf("接收到数据：%sn", receBuf); } } } closesocket(sock_Client); WSACleanup(); return 0; }
注：以下代码需在LINUX下运行 gcc什么的都可以
LINUX下：
一.TCP
linux下TCP服务端代码：
#include#include #include #include #include int main(int argc, char *argv[]) { int server_sockfd;//服务器端套接字 int client_sockfd;//客户端套接字 int len; struct sockaddr_in my_addr; //服务器网络地址结构体 struct sockaddr_in remote_addr; //客户端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区 memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零 my_addr.sin_family=AF_INET; //设置为IP通信 my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上 my_addr.sin_port=htons(8000); //服务器端口号 if((server_sockfd=socket(PF_INET,SOCK_STREAM,0))<0) { perror("socket error"); return 1; } if(bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0) { perror("bind error"); return 1; } if(listen(server_sockfd,5)<0) { perror("listen error"); return 1; }; sin_size=sizeof(struct sockaddr_in); if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&remote_addr,&sin_size))<0) { perror("accept error"); return 1; } printf("accept client %s/n",inet_ntoa(remote_addr.sin_addr)); len=send(client_sockfd,"Welcome to my server/n",21,0);//发送欢迎信息 while((len=recv(client_sockfd,buf,BUFSIZ,0))>0)) { buf[len]='/0'; printf("%s/n",buf); if(send(client_sockfd,buf,len,0)<0) { perror("write error"); return 1; } } close(client_sockfd); close(server_sockfd); return 0; }
linux下TCP客户端代码：
#include#include #include #include #include int main(int argc, char *argv[]) { int client_sockfd; int len; struct sockaddr_in remote_addr; //服务器端网络地址结构体 char buf[BUFSIZ]; //数据传送的缓冲区 memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零 remote_addr.sin_family=AF_INET; //设置为IP通信 remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址 remote_addr.sin_port=htons(8000); //服务器端口号 if((client_sockfd=socket(PF_INET,SOCK_STREAM,0))<0) { perror("socket error"); return 1; } if(connect(client_sockfd,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr))<0) { perror("connect error"); return 1; } printf("connected to server/n"); len=recv(client_sockfd,buf,BUFSIZ,0);//接收服务器端信息 buf[len]='/0'; printf("%s",buf); //打印服务器端信息 while(1) { printf("Enter string to send:"); scanf("%s",buf); if(!strcmp(buf,"quit") break; len=send(client_sockfd,buf,strlen(buf),0); len=recv(client_sockfd,buf,BUFSIZ,0); buf[len]='/0'; printf("received:%s/n",buf); } close(client_sockfd); return 0; }
二.UDP
linux下UDP服务端代码
#include#include #include #include #include int main(int argc, char *argv[]) { int server_sockfd; int len; struct sockaddr_in my_addr; //服务器网络地址结构体 struct sockaddr_in remote_addr; //客户端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区 memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零 my_addr.sin_family=AF_INET; //设置为IP通信 my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上 my_addr.sin_port=htons(8000); //服务器端口号 if((server_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0) { perror("socket error"); return 1; } if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0) { perror("bind error"); return 1; } sin_size=sizeof(struct sockaddr_in); printf("waiting for a packet.../n"); if((len=recvfrom(server_sockfd,buf,BUFSIZ,0,(struct sockaddr *)&remote_addr,&sin_size))<0) { perror("recvfrom error"); return 1; } printf("received packet from %s:/n",inet_ntoa(remote_addr.sin_addr)); buf[len]='/0'; printf("contents: %s/n",buf); close(server_sockfd); return 0; }
linux下UDP客户端代码
#include#include #include #include #include int main(int argc, char *argv[]) { int client_sockfd; int len; struct sockaddr_in remote_addr; //服务器端网络地址结构体 int sin_size; char buf[BUFSIZ]; //数据传送的缓冲区 memset(&remote_addr,0,sizeof(remote_addr)); //数据初始化--清零 remote_addr.sin_family=AF_INET; //设置为IP通信 remote_addr.sin_addr.s_addr=inet_addr("127.0.0.1");//服务器IP地址 remote_addr.sin_port=htons(8000); //服务器端口号 if((client_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0) { perror("socket error"); return 1; } strcpy(buf,"This is a test message"); // 发送的内容 printf("sending: '%s'/n",buf); sin_size=sizeof(struct sockaddr_in); if((len=sendto(client_sockfd,buf,strlen(buf),0,(struct sockaddr *)&remote_addr,sizeof(struct sockaddr)))<0) { perror("recvfrom"); return 1; } close(client_sockfd); return 0; }
最后说一句啦。本网络编程入门系列博客是连载学习的，有兴趣的可以看我博客其他篇。。。。
参考博客：https://blog.csdn.net/u012234115/article/details/54142273
参考博客：https://www.cnblogs.com/zwj-199306231519/p/9067618.html
