简单的UDP-Client

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>#include <errno.h>int main(int argc, char* argv[]){    char buf[1024];    int ret;    int i, len, sockfd;    struct sockaddr_in dest_addr;    sockfd = socket(AF_INET ,SOCK_DGRAM, 0);    if(sockfd == -1){        printf("%s\n", strerror(errno));        return -1;    }    memset(&dest_addr, 0, sizeof(dest_addr));    dest_addr.sin_family=AF_INET;    dest_addr.sin_port = htons(10000);    dest_addr.sin_addr.s_addr=inet_addr("192.168.2.8");    ret = connect(sockfd,(struct sockaddr *)&dest_addr, sizeof(dest_addr));    if(ret != 0){        printf("%s\n", strerror(errno));        return -1;    }    i = 0;    len =  sizeof(buf);    while(i<10000)    {        i++;        int ret = sendto(sockfd, buf, len, 0, (struct sockaddr *)&dest_addr, sizeof(dest_addr));        if (ret < 0)        {            perror("write error");            break;        }    }    printf("send number:%d\n",i);    close(sockfd);    return 0;}