Linux下TCP网络编程与基于Windows下C#socket编程间通信

 1 /* server.c */
 2 #include <sys/types.h> 
 3 #include <sys/socket.h>
 4 #include <sys/ioctl.h>
 5 #include <netinet/in.h>
 6 #include <stdio.h>
 7 #include <stdlib.h>
 8 #include <string.h>
 9 #include <unistd.h>
10 #define PORT   2000    //定义端口号
11 #define BUFFER_SIZE 1024  
12 #define MAX_QUE_CONN_NM 5  //最大缓冲队列
13 int main(void)
14 {
15 
16 /*下面该以太网套接字地址结构体非常重要*/
17 struct sockaddr_in server_addr,client_addr; 
18 int sin_size,recvbytes,wbytes;
19 int ser_fd,cli_fd;  
20 char buf[BUFFER_SIZE];
21 /*  建立 socket 连接，IPv4 协议，字节流套接字  */
22 if((ser_fd = socket(AF_INET,SOCK_STREAM,0))== -1)
23 {
24 perror("socket");
25 exit(1);
26 }
27 printf("Socket id = %d\n",ser_fd);
28 /*  初始化 sockaddr_in 结构体  */
29 server_addr.sin_family = AF_INET;
30 server_addr.sin_port = htons(PORT);
31 server_addr.sin_addr.s_addr = INADDR_ANY;
32 bzero(&(server_addr.sin_zero),8);
33 /*  绑定函数 bind */
34 if(bind(ser_fd,(struct  sockaddr  *)&server_addr,sizeof(struct 
35 sockaddr))==-1)
36 {
37 perror("bind");
38 exit(1); 
39 }
40 printf("Bind success!\n");
41 
42 /*  调用 listen 函数，进行监听  */
43 if(listen(ser_fd,MAX_QUE_CONN_NM)== - 1) 
44 {
45 perror("listen");
46 exit(1); 
47 }
48 printf("Listening......\n");
49 
50 /*  调用 accept 函数，等待客户端的连接  */
51 if((cli_fd = accept(ser_fd,(struct sockaddr *)&client_addr,&sin_size))==-1)
52 {
53 perror("accept");
54 exit(1); 
55 }
56 printf("Have client ready for connecting\n");
57 
58 /*  调用 recv 函数接收客户端的请求  */
59 memset(buf,0,sizeof(buf));
60 if((recvbytes = recv(cli_fd,buf,BUFFER_SIZE,0))== -1)
61 {
62 perror("recv");
63 exit(1); 
64 }
65 /*  将收到的信息(客服端发来的信息)打印出来  */
66 printf("Received a message:%s\n",buf); 
67 /*对客户端发过来的数据进行处理，只是将首字符加2，再发给客户端*/
68 buf[0]=buf[0]+2;
69 if( ( wbytes = write(cli_fd,buf,strlen(buf)) ) == -1 )
70 {
71 perror("handle send");
72 exit(1);
73 }
74 else 
75 printf("handle buf is %s\n",buf);
76 /*  关闭 socket */
77 close(ser_fd);
78 return 0;
79 }

 1 /*client*/
 2 #include<sys/types.h>
 3 #include<sys/socket.h>
 4 #include<sys/ioctl.h>
 5 #include<netinet/in.h>
 6 #include<netdb.h>
 7 #include<stdio.h>
 8 #include<stdlib.h>
 9 #include<string.h>
10 #include<unistd.h>
11 #define PORT 2000  //端口号
12 #define BUFFER_SIZE 1024
13 int main(int argc,char *argv[])
14 {
15 struct sockaddr_in server_addr;
16 int sockfd,sendbytes,rbytes;
17 //int ser_fd;
18 char buf[BUFFER_SIZE];
19 struct hostent *host;
20 /*指定输入参数为3个，否则出错*/
21 if(argc!=3)
22 {
23 perror("Usage:./clinet IP address Text\n");
24 exit(1);
25 }
26 /*地址解析函数*/
27 if( ( host = gethostbyname(argv[1]) ) == NULL )  //得到主机名及相应信息
28 {
29 perror("gethostbyname");
30 exit(1);
31 }
32 memset(buf,0,sizeof(buf));
33 sprintf(buf,"%s",argv[2]);
34 buf[strlen(buf)+1]=‘\0‘;
35 /*建立socket连接，IPv4协议，字节流套接字*/
36 
37 if( ( sockfd = socket(AF_INET,SOCK_STREAM,0) ) == -1 )
38 {
39 perror("socket");
40 exit(1);
41 }
42 printf("Socket id = %d\n",sockfd);
43 
44 /*初始化sockaddr_in 结构体*/                 
45 server_addr.sin_family = AF_INET;    //TCP/IP协议簇
46 server_addr.sin_port = htons(PORT);  // sin_port存储端口号（使用网络字节顺序）  htons将unsigned short从主机字节序转化为网络字节序
47 server_addr.sin_addr = *((struct in_addr *)host->h_addr); //前面指过的，host主机名及相应信息的指针，这里为IP地址
48 bzero(&(server_addr.sin_zero),8);   //等同于memset，清空作用
49 /*调用connect函数主动发起对服务器的连接*/
50 if( ( connect(sockfd,(struct sockaddr *)&server_addr,sizeof(struct sockaddr)) ) == -1 )  //第2个参数，指向要连接套接字的sockaddr结构体的指针
51 {
52 perror("connect");
53 exit(1);
54 }
55 printf("connect server success!\n");
56 /*发送消息给服务器端*/
57 if( ( sendbytes = send(sockfd,buf,strlen(buf),0) ) == -1 )
58 {
59 perror("send");
60 exit(1);
61 }
62 else  printf("buf is %s\n",buf);
63 /* 将服务器处理后的数据读取出来 */
64 if ((rbytes=read(sockfd,buf,100))==-1)
65 {
66 printf("read handle error\n");
67 exit(0);
68 }
69 else 
70 printf("read handle buf is %s \n",buf);
71 close(sockfd);
72 return 0;
73 }