UDP聊天实现（简单版）

两者代码基本一致

关于套接字：

甲方：

  1 #include <stdio.h>

  2 #include <string.h>

  3 #include <netinet/in.h>

  4 #include <stdlib.h>

  5 #include <sys/socket.h>

  6 #include <fcntl.h>

  7 

  8 int main()

  9 {

 10         int ret = 0;

 11         int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 12         if(fd < 0){

 13                 perror("socket");

 14                 exit(EXIT_FAILURE);

 15         }

 16         struct sockaddr_in gg;

 17         gg.sin_family = AF_INET;

 18         gg.sin_port = htons(9527);

 19         gg.sin_addr.s_addr = inet_addr("192.168.1.10");

 20         ret = bind(fd, (struct sockaddr *)&gg, 16);

 21         if(ret < 0){

 22                 perror("bind");

 23                 return 1;

 24         }

 25         unsigned char buff[1024] = {0};

 26         unsigned char data[1024] = {0};

 27         struct sockaddr_in mm;

 28         mm.sin_family = AF_INET;

 29         mm.sin_port = htons(9528);

 30         mm.sin_addr.s_addr = inet_addr("192.168.1.10");

 31         int mm_len = 0;

 32         while(1){

 33                 fd_set st;

 34                 FD_ZERO(&st);

 35                 FD_SET(fd, &st);

 36                 FD_SET(0, &st);

 37                 ret = select(fd+1, &st, 0, 0, 0);

 38                 if(ret < 0){

 39                         perror("select");

 40                         return 1;

 41                 }

 42                 if(FD_ISSET(fd, &st)){

 43                         memset(buff, 0, 1024);

 44                         ret = recvfrom(fd, buff, 1024, 0, (struct sockaddr *)&mm, &mm_len);

 45                         if(ret < 0){

 46                                 perror("recvfrom");

 47                                 exit(EXIT_FAILURE);

 48                         }

 49                         printf("gg said :%s", buff);

 50                 }

 51                 if(FD_ISSET(0, &st)){

 52                         memset(data, 0, 1024);

 53                         read(0, data, 1024);

 54                         ret = sendto(fd, data, strlen(data), 0, (struct sockaddr *)&mm, 16);

 55                          if(ret < 0){

 56                                 perror("sendto");

 57                                 exit(EXIT_FAILURE);

 58                         }

 59                 }

 60 

 61         }

 62         close(fd);

 63 }

View Code

乙方：

  1 #include <stdio.h>

  2 #include <string.h>

  3 #include <netinet/in.h>

  4 #include <stdlib.h>

  5 #include <sys/socket.h>

  6 #include <fcntl.h>

  7 

  8 int main()

  9 {

 10         int ret = 0;

 11         int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 12         if(fd < 0){

 13                 perror("socket");

 14                 exit(EXIT_FAILURE);

 15         }

 16         struct sockaddr_in mm;

 17         mm.sin_family = AF_INET;

 18         mm.sin_port = htons(9528);

 19         mm.sin_addr.s_addr = inet_addr("192.168.1.10");

 20         ret = bind(fd, (struct sockaddr *)&mm, 16);

 21         if(ret < 0){

 22                 perror("bind");

 23                 return 1;

 24         }

 25         unsigned char buff[1024] = {0};

 26         unsigned char data[1024] = {0};

 27         struct sockaddr_in gg;

 28         gg.sin_family = AF_INET;

 29         gg.sin_port = htons(9527);

 30         gg.sin_addr.s_addr = inet_addr("192.168.1.10");

 31         int gg_len = 0;

 32         while(1){

 33                 fd_set st;

 34                 FD_ZERO(&st);

 35                 FD_SET(fd, &st);

 36                 FD_SET(0, &st);

 37                 ret = select(fd+1, &st, 0, 0, 0);

 38                 if(ret < 0){

 39                         perror("select");

 40                         return 1;

 41                 }

 42                 if(FD_ISSET(fd, &st)){

 43                         memset(buff, 0, 1024);

 44                         ret = recvfrom(fd, buff, 1024, 0, (struct sockaddr *                                                                    )&gg, &gg_len);

 45                         if(ret < 0){

 46                                 perror("recvfrom");

 47                                 exit(EXIT_FAILURE);

 48                         }

 49                         printf("mm said :%s", buff);

 50                 }

 51                 if(FD_ISSET(0, &st)){

 52                         memset(data, 0, 1024);

 53                         read(0, data, 1024);

 54                         ret = sendto(fd, data, strlen(data), 0, (struct sockaddr *)&gg, 16);

 55                          if(ret < 0){

 56                                 perror("sendto");

 57                                 exit(EXIT_FAILURE);

 58                         }

 59                 }

 60         }

 61         close(fd);

 62 }

~        

View Code