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client.c
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client.c
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#include <stdio.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
void SocketCommon(int sock, struct sockaddr_in* server)
{
char buf[1024];
struct sockaddr_in peer;
while(1)
{
socklen_t len = sizeof(peer);
printf("Please Enter# \n");
fflush(stdout);
ssize_t s = read(0,buf,sizeof(buf)-1);
if(s > 0)
{
buf[s-1] = 0;
sendto(sock,buf,strlen(buf),0,(struct sockaddr*)server,sizeof(*server));
ssize_t _s = recvfrom(sock,buf,sizeof(buf)-1,0,(struct sockaddr*)&peer,&len);
if(_s > 0)
{
buf[_s] = 0;
printf("server echo# %s\n",buf);
}
}
}
}
int main(int argc,char *argv[])
{
if(argc < 3)
{
perror("argc");
exit(1);
}
//创建 socket 文件描述符
//AF_INET ipv4地址类型
//SOCK_DGRAM udp类型
//0 默认使用SOCK_DGRAM类型
int sock = socket(AF_INET,SOCK_DGRAM,0);
if(sock < 0)
{
perror("socket");
exit(2);
}
struct sockaddr_in server;
server.sin_family = AF_INET;//ipv4地址类型
server.sin_port = htons(atoi(argv[2]));//端口号
server.sin_addr.s_addr = inet_addr(argv[1]);//ipv4地址转换 因为输入的是点分十进制
SocketCommon(sock,&server);
return 0;
}