socket udp编程

[yuanzhenhai]

rtsp，在完成 describe ，进入setup之后，vlc给服务器发送一个client_port=55990-55991 么，想问一下 socket编程，
udp如何向已知IP 和端口号 的目标发送数据？？

[yuanzhenhai]

struct sockaddr_in client;
client.sin_family=AF_INET;
clientr.sin_port=htons(DEST_PORT);
clientr.sin_addr.s_addr=inet_addr(DEST_IP);
socket1=socket(AF_INET,SOCK_DGRAM,0);
connect(socket1, (const sockaddr *)&client, len) ;//申请UDP套接字

send(socket1,buffer,size,0);

似乎这种方法可行，不知道有没有别的方法？？
比如用sendto()，注意已知道IP和端口号

[Atoric]

struct sockaddr_in client;
client.sin_family=AF_INET;
client.sin_port=htons(DEST_PORT);
client.sin_addr.s_addr=inet_addr(DEST_IP);
sock =socket(AF_INET,SOCK_DGRAM,0)；

sendto(sock, data, datalen, 0, (struct sockaddr*)client, sizeof(client));

[uv_yifan]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>


int main(int argc, char** argv)
{
struct sockaddr_in saddr;
int sock;
int addr_len;
int len;
char buf[128];
int yes;

if((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
perror("socket");
exit(errno);
}else
{
printf("created socket success\n");
}

yes = 1;

setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &yes, sizeof(yes));

saddr.sin_family = AF_INET;
if(argv[2])
{
saddr.sin_port = htons(atoi(argv[2]));
}else
{
saddr.sin_port = htons(7838);
}
if(argv[1])
{
saddr.sin_addr.s_addr = inet_addr(argv[1]);
}else
{
printf("ip\n");
return -1;
}

addr_len = sizeof(saddr);
strcpy(buf,"hello world!");
len = sendto(sock, buf, strlen(buf), 0, (struct sockaddr *)&saddr, addr_len);
if( len < 0 )
{
printf("send fail\n");
}else
{
printf("send success\n");
}

return 0;
}
不知道这个符合lz的要求不，注释就不用写了，都比较明了。希望对lz有所帮助。