读取文件数据，UDP传输代码,C代码库,德仔网

代码语言
代码分类
【C】读取文件数据，UDP传输
作者:刘畅19877 / 发布于2012/10/22/ 713
用于本地文件读取，直接进行UDP的转发
#include<stdio.h></div>
#include<stdlib.h></div>
#include<unistd.h></div>
#include<string.h></div>
#include<sys/socket.h></div>
#include<netinet/in.h></div>
#include<fcntl.h></div>
<div></div>
<div>define SERV_PORT 8000</div>
<div>define BUF_SIZE 1316*10</div>
<div>define MAX_LINE 1316*10</div>
<div>define FILE_NAME "CCTV.264ts"</div>
<div></div>
<div>/*use to read file' data to send it through socket*/</div>
<div>int read_file(int sockfd, struct sockaddr * pcliaddr, socklen_t len)</div>
<div>{</div>
<div>  int result ;</div>
<div>  char buf[BUF_SIZE];</div>
<div>  int fd = -1;</div>
<div></div>
<div>  int l_middlen = 0;</div>
<div>  int write_success = 0;</div>
<div>  char middle_buf[2*BUF_SIZE];</div>
<div>  char temp_buf[BUF_SIZE];</div>
<div>  //add recv</div>
<div>  char recv_buf[BUF_SIZE];</div>
<div>  int recv_num = -1;</div>
<div></div>
<div>  if ((fd = open(FILE_NAME, O_RDONLY)) < 0){</div>
<div>    printf("open error\n");</div>
<div>    return -1;</div>
<div>  }
<div></div>
<div>// for(;;){</div>
<div>  //---add recv</div>
<div>  recv_num = recvfrom(sockfd, recv_buf, BUF_SIZE, 0, pcliaddr,&len);</div>
<div>  printf("recv_num:%d\n",recv_num);</div>
<div></div>
<div>  while((result = read(fd, buf, BUF_SIZE)) > 0) {</div>
<div></div>
<div></div>
<div>    usleep(10000);</div>
<div>    memcpy(middle_buf+l_middlen, buf, result);</div>
<div>    l_middlen += result;</div>
<div></div>
<div>    if (l_middlen > BUF_SIZE) {</div>
<div></div>
<div>      do{</div>
<div>        write_success = sendto(sockfd, buf, BUF_SIZE, 0    }
<div></div>
<div></div>
<div>    /*if (sendto(sockfd, buf, BUF_SIZE, 0, pcliaddr, len ) < 0) {</div>
<div>      printf("----n :%d\n", n);</div>
<div>      printf("sendto error\n");</div>
<div>      return -1;</div>
<div>    }*/</div>
<div></div>
<div>// }
<div>  }
<div>  if (result < 0)</div>
<div>    printf("read error\n");</div>
<div>}
<div></div>
<div></div>
<div>/*use to recive data and then send it*/</div>
<div>void dg_echo(int sockfd, struct sockaddr * pcliaddr, socklen_t clilen)</div>
<div>{</div>
<div>  int n;</div>
<div>  socklen_t len;</div>
<div>  char mesg[BUF_SIZE];</div>
<div></div>
<div>// for ( ; ; ) {</div>
<div>    len = clilen;</div>
<div>    n = recvfrom(sockfd, mesg, MAX_LINE, 0, pcliaddr, &len);</div>
<div>    //memset(mesg, '1', BUF_SIZE);</div>
<div>    //sendto(sockfd, mesg, n, 0, pcliaddr, len);/*use to intialization*/</div>
<div>}
<div></div>
<div></div>
<div>int main(void)</div>
<div>{</div>
<div>  int   sockfd;</div>
<div>  struct sockaddr_in servaddr, cliaddr;</div>
<div></div>
<div>  sockfd = socket(AF_INET, SOCK_DGRAM, 0);</div>
<div>  memset(&servaddr, 0, sizeof(servaddr));</div>
<div></div>
<div>  servaddr.sin_family = AF_INET;</div>
<div>  servaddr.sin_addr.s_addr = htonl(INADDR_ANY);</div>
<div>  servaddr.sin_port = htons(SERV_PORT);</div>
<div></div>
<div>  bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));</div>
<div></div>
<div>  dg_echo(sockfd, (struct sockaddr *)&cliaddr, sizeof(cliaddr));</div>
<div>}
<div>                                                                    </div>
<div></div>
<div>    read_file(sockfd, pcliaddr, len);</div>
<div>// }
<div>}
试试其它关键字
　UDP传输　
同语言下
可能有用的
刘畅19877贡献的其它代码(2)