1.从txt文件中按指定格式 读出：

int read_raw_hex_data(const char* path,int data_length ,int* a) {
  FILE* fpRead = NULL;
  int ret = 0;
  int i = 0;
  fopen_s(&fpRead, path, "r");
  if (fpRead == NULL)
  {
    printf("Fail to read raw data file!");
    ret = -1;
    return ret;
  }

  for (i = 0; i < data_length; i++)
  {
    fscanf_s(fpRead, "%x", &a[i]);
  }
  fclose(fpRead);

  return ret;
}

 2. 按指定格式保存到txt文件中：

int  save_data(const char* path, int data_length, double* a) {
  FILE* fpWrite = NULL;
  int i = 0;
  fopen_s(&fpWrite, path, "w");
  if (fpWrite == NULL)
  {
    printf("Failed to save data!");
    exit(1);
  }
  for (i = 0; i < data_length; i++)
    fprintf(fpWrite, "%.8f\n", a[i]);
  fclose(fpWrite);
  return 0;
}