Save TDMS files in between

Hello,

I am using the TDMS C DLL to create *.tdms files. Everything works fine and also streaming my data to the file works perfect.

The only issue is, that I can't save the file in between. I would prefer to always save the document after a data point is added. Unfortunately I always get an error message when I try to save in between. Saving and closing at the end works fine. 

I found similar problems under

http://www.ni.com/product-documentation/55159/en/ Code 281013

and https://forums.ni.com/t5/DIAdem/Function-DDC-SaveFile-from-the-DIAdem-Connectivity-Library/td-p/718290?profile.language=en

The first one is not satisfying, because I cannot check if all operations are completed. The second solution did not work for me.

I attached a picture of the code, where the problem occurs.

Thanks for your help.