NiRFSA_Rea​dPowerSpec​trumF64 function call in TestStand 4.5.1 cause system error

Question

I am using TestStand with niRFSA.dll to call the function niRFSA_ReadPowerSpectrumF64. This function will make the NI RFSA takes a spectrum sweep and return an array of amplitudes, as well as a structure that contains the frequencies information. My teststand sequence file is attached. The sequence editor will execute this function call, and actually retrieve correct data from the RFSA, I can see all the data in the Locals variables. The data are correct. However, the sequence editor also throws out system error, with no further details.
See the error window also attached.
Once in a while, the sequence editor will work just fine, executing the same function call without throwing out error, this is less than 10% of the time.
I am using this on Windows 7.
Let me know if you have any insight.
Attachments:
RFSA Sequence.seq ‏7 KB
Capture.JPG ‏33 KB

Answer 1

Hi Doug:
Yes this is what I suspected also. Since the container type was a TS custom type I created to accept the C struct from the instrument. But when the data come back from the dll is a C struct, and there lays the conflict, I think its the packaging layer semantics have some conflict, even though each of the element in the C struct matches the TS type definitions, as I received all that data correctly in TS.
Thanks,
Juswanto