网络编程，client，server初始版

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客户端

#include <stdio.h>#include <sys/socket.h>#include <string.h>#include <stdlib.h>#include <netinet/in.h>int main(int argc,char **argv){int sockfd;int n;struct sockaddr_in servaddr,cliaddr;char sendline[1000];char recvline[1000];if(argc != 2){printf("usage:client <IP address>\n");exit(-1);}sockfd = socket(AF_INET,SOCK_STREAM,0);if(sockfd == -1){printf("socket wrong\n");exit(-1);}bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr = inet_addr(argv[1]);servaddr.sin_port = htons(32000);connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr));while(fgets(sendline,100,stdin) != NULL){sendto(sockfd,sendline,strlen(sendline),0,(struct sockaddr*)&servaddr,sizeof(servaddr));n = recvfrom(sockfd,recvline,1000,0,NULL,NULL);recvline[n] = '\0';fputs(recvline,stdout);}    return 0;}

服务器

#include <stdio.h>#include <sys/socket.h>#include <stdlib.h>#include <string.h>#include <netinet/in.h>int main(){int listenfd,connfd;int n;pid_t pid;int i;struct sockaddr_in servaddr,cliaddr;socklen_t clilen;char msg[1000];listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_addr.s_addr = htonl(INADDR_ANY);servaddr.sin_port = htons(32000);bind(listenfd,(struct sockaddr *)&servaddr,sizeof(servaddr));listen(listenfd,1024);for(;;){clilen = sizeof(cliaddr);connfd = accept(listenfd,(struct sockaddr *)&cliaddr,&clilen);if((pid = fork()) == 0){close(listenfd);while(1)    {n = recvfrom(connfd,msg,1000,0,(struct sockaddr*)&cliaddr,&clilen);if(n == 0){printf("client is close!\n");exit(0);}printf("************************\n");msg[n] = '\0';printf("%s\n",msg);printf("************************\n");for(i = 0;i < n;i++){if((msg[i] >= 'a') && (msg[i] <= 'z')){msg[i] = msg[i] - 32;}}sendto(connfd,msg,n,0,(struct sockaddr *)&cliaddr,sizeof(cliaddr));}close(connfd);}}close(listenfd);    return 0;}

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