编写/读取文件时出错

Question

我有2个功能与同一文件一起使用。第一个函数从文件中读取：

myRepositoryPointCloud::point3d myRepositoryPointCloud::Reading(int i, int j, int k)
{
  ifstream rf("C:\\PointCloud.dat", ios::out | ios::binary);
  if (!rf) {
      cout << "Cannot open file!" << endl;
  }

  point3d resultPt;
  rf.seekg((i * GetCntPointY() * GetCntPointZ() + j * GetCntPointZ() + k) * sizeof(point3d));

  rf.read((char *)&resultPt, sizeof(point3d));

  rf.close();
  if (!rf.good()) {
      cout << "Error occurred at reading time!" << endl;
  }
  return resultPt;
}

secnd函数在同一文件中写入：

void myRepositoryPointCloud::Writing(int i, int j, int k, point3d & APoint)
{
  ofstream wf("C:\\PointCloud.dat", ios::out | ios::binary);

  if (!wf) {
      cout << "Cannot open file!" << endl;
  }

  wf.seekp((i * GetCntPointY() * GetCntPointZ() + j * GetCntPointZ() + k) * sizeof(point3d));

  wf.write((char *)&APoint, sizeof(point3d));

  wf.close();
  if (!wf.good()) {
      cout << "Error occurred at writing time!" << endl;
  }
}

它们都在循环中调用：

      point3d CurrentPoint;

      for (int i = 0; i < EndPoint.i - StartPoint.i; i++)
        {
          for (int j = 0; j < EndPoint.j - StartPoint.j; j++)
            {
              for (int k = 0; k < EndPoint.k - StartPoint.k; k++)
                {
                  CurrentPoint = FPointCloud->Reading(i, j, k);

                  if (!CurrentPoint.deleted) 
                  {
                    Sphere->CalcIntersectSphereToPoint(&CurrentPoint);                    

                    if (CurrentPoint.deleted || CurrentPoint.visible)
                    {
                       FPointCloud->Writing(i, j, k, &CurrentPoint);
                    }
                  }
            }
        }
    }

第一个函数从文件中读取变量值，然后程序对其进行某些操作，然后此变量值写入文件第二在同一位置i，j，k的功能。问题发生在循环的第二步。阅读功能返回“错误发生在阅读时间！”。无需打电话循环第二函数写作 - 一切都很好。也许我没有在第二个功能中释放一些资源？