UDP聊天实现（简单版）
2024-10-10 11:13:29
两者代码基本一致
关于套接字：
甲方：
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <fcntl.h> int main()
{
int ret = ;
int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(fd < ){
perror("socket");
exit(EXIT_FAILURE);
}
struct sockaddr_in gg;
gg.sin_family = AF_INET;
gg.sin_port = htons();
gg.sin_addr.s_addr = inet_addr("192.168.1.10");
ret = bind(fd, (struct sockaddr *)&gg, );
if(ret < ){
perror("bind");
return ;
}
unsigned char buff[] = {};
unsigned char data[] = {};
struct sockaddr_in mm;
mm.sin_family = AF_INET;
mm.sin_port = htons();
mm.sin_addr.s_addr = inet_addr("192.168.1.10");
int mm_len = ;
while(){
fd_set st;
FD_ZERO(&st);
FD_SET(fd, &st);
FD_SET(, &st);
ret = select(fd+, &st, , , );
if(ret < ){
perror("select");
return ;
}
if(FD_ISSET(fd, &st)){
memset(buff, , );
ret = recvfrom(fd, buff, , , (struct sockaddr *)&mm, &mm_len);
if(ret < ){
perror("recvfrom");
exit(EXIT_FAILURE);
}
printf("gg said :%s", buff);
}
if(FD_ISSET(, &st)){
memset(data, , );
read(, data, );
ret = sendto(fd, data, strlen(data), , (struct sockaddr *)&mm, );
if(ret < ){
perror("sendto");
exit(EXIT_FAILURE);
}
} }
close(fd);
}
乙方：
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <fcntl.h> int main()
{
int ret = ;
int fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if(fd < ){
perror("socket");
exit(EXIT_FAILURE);
}
struct sockaddr_in mm;
mm.sin_family = AF_INET;
mm.sin_port = htons();
mm.sin_addr.s_addr = inet_addr("192.168.1.10");
ret = bind(fd, (struct sockaddr *)&mm, );
if(ret < ){
perror("bind");
return ;
}
unsigned char buff[] = {};
unsigned char data[] = {};
struct sockaddr_in gg;
gg.sin_family = AF_INET;
gg.sin_port = htons();
gg.sin_addr.s_addr = inet_addr("192.168.1.10");
int gg_len = ;
while(){
fd_set st;
FD_ZERO(&st);
FD_SET(fd, &st);
FD_SET(, &st);
ret = select(fd+, &st, , , );
if(ret < ){
perror("select");
return ;
}
if(FD_ISSET(fd, &st)){
memset(buff, , );
ret = recvfrom(fd, buff, , , (struct sockaddr * )&gg, &gg_len);
if(ret < ){
perror("recvfrom");
exit(EXIT_FAILURE);
}
printf("mm said :%s", buff);
}
if(FD_ISSET(, &st)){
memset(data, , );
read(, data, );
ret = sendto(fd, data, strlen(data), , (struct sockaddr *)&gg, );
if(ret < ){
perror("sendto");
exit(EXIT_FAILURE);
}
}
}
close(fd);
}
~
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