send_big_file_old.cpp

文件传输

#include "send_big_file_old.h"
int main(int argc, char* argv[]){
    int connfd, sockfd;
    char file_name[20];
    struct sockaddr_in servaddr;
    struct sockaddr_in tempaddr;
    struct sockaddr_in cliaddr;
    socklen_t clilen;
    socklen_t templen;
    size_t number_bytes;
    if((sockfd = socket(AF_INET, SOCK_STREAM,0)) == -1){//建立套接字
      perror("socket");
      exit(1);
    }
    bzero(&servaddr,sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = 0;//系统自动生成端口号
    clilen = sizeof(cliaddr);
    if (bind(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) == -1){//綁定套接子
        perror("bind");
        exit(1);
    }
    templen = sizeof(struct sockaddr);
    if (getsockname(sockfd, (struct sockaddr *)&tempaddr,&templen) == -1){//得到端口号
        perror("getsockname");
        exit(1);
    }
    printf("Server is listening on port %d\n",ntohs(tempaddr.sin_port));
    if (listen(sockfd,BACKLOG) == -1){//监听端口，等待连接
        perror("listen");
        exit(1);
    }
    for(;;){
        clilen = sizeof(cliaddr);
        connfd = accept(sockfd,(struct sockaddr *)&cliaddr,&clilen);//建立连接
        if(connfd == -1){
            perror("accept");
            continue;
        }
        if(read_cmd(connfd,file_name,sizeof(file_name))==-1){//得到要传送文件的名字
            printf("read file name error!\n");
            close(connfd);
            continue;
        }
        if(send_file(connfd,file_name)==-1){//传输文件
            printf("Send file error\n");
        }
        close(connfd);
    }
    return 0;
}