C++中Socket网络编程实例详解

//服务器端  
    
  #include<stdio.h>  
  #include<stdlib.h>  
  #include<string.h>  
  #include<errno.h>  
  #include<sys/types.h>  
  #include<sys/socket.h>  
  #include<netinet/in.h>  
    
  #define MAXLINE 4096  
    
  int main(int argc, char** argv)  
  {  
    int  listenfd, connfd;  
    struct sockaddr_in   servaddr;  
    char  buff[4096];  
    int   n;  
    
    if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1 ){  
    printf("create socket error: %s(errno: %d)\n",strerror(errno),errno);  
    exit(0);  
    }  
    
    memset(&servaddr, 0, sizeof(servaddr));  
    servaddr.sin_family = AF_INET;  
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);  
    servaddr.sin_port = htons(6666);  
    
    if( bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == -1){  
    printf("bind socket error: %s(errno: %d)\n",strerror(errno),errno);  
    exit(0);  
    }  
    
    if( listen(listenfd, 10) == -1){  
    printf("listen socket error: %s(errno: %d)\n",strerror(errno),errno);  
    exit(0);  
    }  
    
    printf("======waiting for client's request======\n");  
    while(1){  
    if( (connfd = accept(listenfd, (struct sockaddr*)NULL, NULL)) == -1){  
      printf("accept socket error: %s(errno: %d)",strerror(errno),errno);  
      continue;  
    }  
    n = recv(connfd, buff, MAXLINE, 0);  
    buff[n] = '\0';  
    printf("recv msg from client: %s\n", buff);  
    close(connfd);  
    }  
    
    close(listenfd);  
  }

客户端  
    
  #include<stdio.h>  
  #include<stdlib.h>  
  #include<string.h>  
  #include<errno.h>  
  #include<sys/types.h>  
  #include<sys/socket.h>  
  #include<netinet/in.h>  
    
  #define MAXLINE 4096  
    
  int main(int argc, char** argv)  
  {  
    int  sockfd, n;  
    char  recvline[4096], sendline[4096];  
    struct sockaddr_in  servaddr;  
    
    if( argc != 2){  
    printf("usage: ./client <ipaddress>\n");  
    exit(0);  
    }  
    
    if( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){  
    printf("create socket error: %s(errno: %d)\n", strerror(errno),errno);  
    exit(0);  
    }  
    
    memset(&servaddr, 0, sizeof(servaddr));  
    servaddr.sin_family = AF_INET;  
    servaddr.sin_port = htons(6666);  
    if( inet_pton(AF_INET, argv[1], &servaddr.sin_addr) <= 0){  
    printf("inet_pton error for %s\n",argv[1]);  
    exit(0);  
    }  
    
    if( connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0){  
    printf("connect error: %s(errno: %d)\n",strerror(errno),errno);  
    exit(0);  
    }  
    
    printf("send msg to server: \n");  
    fgets(sendline, 4096, stdin);  
    if( send(sockfd, sendline, strlen(sendline), 0) < 0)  
    {  
    printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);  
    exit(0);  
    }  
    
    close(sockfd);  
    exit(0);  
  }