Linux平台下基于TCP/IP协议的C++网络编程初步
Linux平台下基于TCP/IP协议的C++网络编程初步
实验平台：Ubuntu(Linux)
开发工具：Eclipse+CDT
作者：@郑海波 http://blog.csdn.net/nuptboyzhb/
特点：
1.基于Linux平台的网络编程，最重要的特点是要调用Linux的API函数。这是与windows平台最大的不同。
2.我们将发送的消息封装成结构体，增添了其传递消息的复杂性。
3.我们用的是socket编程，没有用ACE网络编程。
服务器：
[c++ code]
/* * MyMain.cpp * * Created on: 2012-9-19 * Author: zhb */#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include <sys/wait.h>#include <arpa/inet.h>#include <unistd.h>#define SERVPORT 3333#define BACKLOG 10#define MAXSIZE 1024/* *自定义信息 */typedef struct MyMessage{ int ID; char info[256];}MyMessage,*pMyMessage;int main() {int sockfd, client_fd;struct sockaddr_in my_addr;struct sockaddr_in remote_addr;//创建套接字if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {perror("socket create failed!");exit(1);}//绑定端口地址my_addr.sin_family = AF_INET;my_addr.sin_port = htons(SERVPORT);my_addr.sin_addr.s_addr = INADDR_ANY;bzero(&(my_addr.sin_zero), 8);if (bind(sockfd, (struct sockaddr*) &my_addr, sizeof(struct sockaddr))== -1) {perror("bind error!");exit(1);}//监听端口if (listen(sockfd, BACKLOG) == -1) {perror("listen error");exit(1);}while (1) {//int sin_size = sizeof(struct sockaddr_in);socklen_t sin_size = sizeof(struct sockaddr_in);if ((client_fd = accept(sockfd,(struct sockaddr*) &remote_addr,&sin_size)) == -1){perror("accept error!");continue;}printf("Received a connection from %s\n", (char*)inet_ntoa(remote_addr.sin_addr));//子进程段if (!fork()){//接受client发送的请示信息int rval;char buf[MAXSIZE];if ((rval = read(client_fd, buf, MAXSIZE)) < 0) {perror("reading stream error!");continue;}printf("%s\n", buf);//向client发送信息//char* msg = "Hello,Mr hqlong, you are connected!\n";MyMessage data;memset((void *)&data,0,sizeof(MyMessage));data.ID=123;strcpy(data.info,"This message come from ServSocket!");if(send(client_fd,(void*)&data,sizeof(MyMessage),0) == -1){perror("send error!");}close(client_fd);exit(0);}close(client_fd);}return 0;}
客户端：
[c++ code]
/* * MyMainClient.cpp * * Created on: 2012-9-19 * Author: zhb */#include <stdio.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include <sys/wait.h>#include <arpa/inet.h>#include <unistd.h>#define SERVPORT 3333#define MAXDATASIZE 100#define SERVER_IP "127.0.0.1"#define DATA "this is a client message"/* *自定义信息 */typedef struct MyMessage{ int ID; char info[256];}MyMessage,*pMyMessage;int main(int argc, char* argv[]) {int sockfd, recvbytes;//char buf[MAXDATASIZE];MyMessage recvData;struct sockaddr_in serv_addr;if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {perror("socket error!");exit(1);}bzero(&serv_addr, sizeof(serv_addr));serv_addr.sin_family = AF_INET;serv_addr.sin_port = htons(SERVPORT);serv_addr.sin_addr.s_addr = inet_addr(SERVER_IP);if (connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(struct sockaddr))== -1) {perror("connect error!");exit(1);}write(sockfd, DATA, sizeof(DATA));memset((void *)&recvData,0,sizeof(MyMessage));if ((recvbytes = recv(sockfd, (void *)&recvData,sizeof(MyMessage), 0)) == -1) {perror("recv error!");exit(1);}//buf[recvbytes] = '\0';printf("Received:ID=%d,Info= %s",recvData.ID,recvData.info);close(sockfd);return 0;}
不足：服务器没有进行多线程处理！当多个Client接入时，应考虑多线程编程。以后继续深入...
相关链接：基于windows平台的TCP/IP协议的C++网络编程：http://blog.csdn.net/nuptboyzhb/article/details/7391150