读卡器应用函数整理 2.输出金额到dat文件

 #define DEST_FILE_NAME "dest_file.dat"

 

 

//输出金额到.dat文件
  int dest_file;
  dest_file=open(DEST_FILE_NAME,O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
  if(dest_file<0)
  {
  printf("open the dest file error\n");
  exit(1);
  }
  if((write(dest_file,a,i)&&write(dest_file,tmp,sizeof(tmp)))<0)
  {
  printf("write the dest file error\n");
  exit(1);
  }
  close(dest_file); 

 

   
//输出金额到.dat文件

unsigned long int b[1];

b[0]=count;

 

  int dest_file;
  dest_file=open(DEST_FILE_NAME,O_WRONLY|O_CREAT|O_TRUNC,S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
  if(dest_file<0)
  {
  printf("open the dest file error\n");
  exit(1);
  }
  if((write(dest_file,b,4))<0)
  {
  printf("write the dest file error\n");
  exit(1);
  }
  close(dest_file);