TCP之client.c和common.h

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</pre><p>client.c </p><pre class="cpp" name="code">#include "../Common/common.h"  int main(int argc, char *argv[])  {      int clientfd;        if(argc!=2)      {          fprintf(stderr,"Usage:./fileclient <IP_Address>\n");          exit(1);      }      struct sockaddr_in clientaddr;      bzero(&clientaddr,sizeof(clientaddr));          clientaddr.sin_family=AF_INET;      clientaddr.sin_addr.s_addr=htons(INADDR_ANY);      clientaddr.sin_port=htons(0);            clientfd=socket(AF_INET,SOCK_STREAM,0);            if(clientfd<0)         {          perror("socket");          exit(1);      }        if(bind(clientfd,(struct sockaddr*)&clientaddr,sizeof(clientaddr))<0)      {          perror("bind");          exit(1);      }        struct sockaddr_in svraddr;      bzero(&svraddr,sizeof(svraddr));  //将字符串形式的IP地址转换成网络字节序    if(inet_aton(argv[1],&svraddr.sin_addr)==0)      {          perror("inet_aton");          exit(1);      }      svraddr.sin_family=AF_INET;      svraddr.sin_port=htons(PORT);            socklen_t svraddrlen=sizeof(svraddr);      if(connect(clientfd,(struct sockaddr*)&svraddr,svraddrlen)<0)          {          perror("connect");          exit(1);      }            //recv file imformation      char buff[BUFFSIZE];      char filename[FILE_NAME_MAX_SIZE];      int count;      bzero(buff,BUFFSIZE);        count=recv(clientfd,buff,BUFFSIZE,0);      if(count<0)      {          perror("recv");          exit(1);      }      strncpy(filename,buff,strlen(buff)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buff));        printf("Preparing recv file : %s from %s \n",filename,argv[1]);         //recv file      FILE *fd=fopen(filename,"wb+");      if(NULL==fd)      {          perror("open");          exit(1);      }      bzero(buff,BUFFSIZE);        int length=0;      while(length=recv(clientfd,buff,BUFFSIZE,0))      {          if(length<0)          {              perror("recv");              exit(1);          }          int writelen=fwrite(buff,sizeof(char),length,fd);          if(writelen<length)          {              perror("write");              exit(1);          }          bzero(buff,BUFFSIZE);      }      printf("Receieved file:%s from %s finished!\n",filename,argv[1]);      fclose(fd);      close(clientfd);      return 0;  }

common.h

#ifndef __COMMON_H_#define __COMMON_H_#include <stdio.h>  #include <stdlib.h>  #include <unistd.h>  #include <string.h>  #include <sys/types.h>  #include <sys/stat.h>  #include <sys/socket.h>  #include <netinet/in.h>    #define PORT 6000  #define LISTENQ 20  #define BUFFSIZE 4096  #define FILE_NAME_MAX_SIZE 512#endif

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