pcd file format problem

[NtYRajzx]

Hello,
I would like to generate a real-time octomap system based on rvis by using the pcl_data_tmp.pcd file which is produced by the program as the system runs. However, I currently find that the stored point cloud data seems to be unable to be used later. I wonder whether it is the file format problem. If so, how can we generate correct format pcd files in real time?
thank you
best regards