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c - 从服务器向客户端发送 UDP 消息

转载 作者:太空宇宙 更新时间:2023-11-04 02:31:29 26 4
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我正在尝试使用 UDP 套接字从服务器向客户端发送消息...但是,我的客户端没有收到任何消息。任何反馈将不胜感激!

编辑:也许我应该澄清一下,消息似乎已成功发送,但是当我运行客户端时,它会卡在等待数据中...任何关于为什么会发生这种情况的指示都将不胜感激!

UDP 服务器

#include<stdio.h> 
#include<string.h>
#include<stdlib.h>
#include<arpa/inet.h>
#include<sys/socket.h>

#define SERVER "127.0.0.1"
#define BUFLEN 512 //Max length of buffer
#define PORT 8888 //The port on which to listen for incoming data

void die(char *s)
{
perror(s);
exit(1);
}

int main(void)
{
struct sockaddr_in si_other;

int s, i, slen = sizeof(si_other);
char buf[BUFLEN];
char message[BUFLEN];
//create a UDP socket
if ((s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
die("socket");
}

// zero out the structure
memset((char *) &si_other, 0, sizeof(si_other));
si_other.sin_family = AF_INET;
si_other.sin_port = htons(PORT);

if (inet_aton(SERVER , &si_other.sin_addr) == 0)
{
fprintf(stderr, "inet_aton() failed\n");
exit(1);
}

//bind socket to port
if( bind(s , (struct sockaddr*)&si_other, sizeof(si_other) ) == -1)
{
die("bind");
}
else
{
printf ("Success!\n");
}


while(1)
{
printf("Enter message : ");
gets(message);

//send the message
if (sendto(s, message, strlen(message) , 0 , (struct sockaddr *) &si_other, slen)==-1)
{
die("sendto()");
}
else
{
printf ("Success!\n");
}

}

close(s);
return 0;
}

UDP 客户端

#include<stdio.h> //printf
#include<string.h> //memset
#include<stdlib.h> //exit(0);
#include<arpa/inet.h>
#include<sys/socket.h>


#define BUFLEN 512 //Max length of buffer
#define PORT 8888 //The port on which to send data

void die(char *s)
{
perror(s);
exit(1);
}

int main(void)
{
struct sockaddr_in si_me, si_other;
int s, i, slen=sizeof(si_other), recv_len;
char buf[BUFLEN];
char message[BUFLEN];

if ( (s=socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
{
die("socket");
}

// zero out the structure
memset((char *) &si_me, 0, sizeof(si_me));

si_me.sin_family = AF_INET;
si_me.sin_port = htons(PORT);
si_me.sin_addr.s_addr = htonl(INADDR_ANY);

while(1)
{
printf("Waiting for data...");
fflush(stdout);

//try to receive some data, this is a blocking call
if ((recv_len = recvfrom(s, buf, BUFLEN, 0, (struct sockaddr *) &si_other, &slen)) == -1)
{
die("recvfrom()");
}

//print details of the client/peer and the data received
printf("Received packet from %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
printf("Data: %s\n" , buf);
}

close(s);
return 0;
}

最佳答案

从客户端而不是服务器调用 bind()

关于c - 从服务器向客户端发送 UDP 消息,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42699113/

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