dynamically called vi, PDM invalid file reference

Hello

I can't explain a strange behavior, I hope someone can give me a hint.

First of all, do not ask why I need this way to go, I would like to understand why this is happening.

We have a FGV which has 3 actions: Init, write data and close. It works on the TDMS files. The action of the init creates a TDMS file reference that is stored in a shift register to be prepared, used by writing and finally narrow cases.

Everything is OK, if I use this FGV simply in a main VI directly from the block diagram. So that I can init, write data and finally close the PDM file.

However, for some reason, appeared a new requirement: to be able to 'Init' and 'Close' the TDMS file using the FGV, but within a dynamically called VI (a pop-up window that may not stop the execution of the appellant).

So in primary VI, I call dynamically VI one another by using the asynchronous call (flag x 80, "call and forget" method), and it dynamically called VI fires the FGV TDMS.

When I probe the reference of TDMS files, I can see that it gets its value correctly after the case 'Init' of fire. After this 'init' which happened (from Dynamics called VI), a location in the MAIN VI starts calling this FGV with enum action 'Write '. I can see via sensors, the case of writing Gets the same number of REF TDMS file which has been stored in the shift register after the case 'Init '.

But even so, the VERY first function TDMS write throws an error msg "TDMS file invalid reference '! How is it possible, if the file reference is OK and the same as that created by the function 'File open TDMS' in case 'init '?

Again, if I execute 'init' action also directly the main VI, not a third dynamically called VI, everything is OK, it works.

I hope that my explanation is not too bad

Thanks for the tips and if no idea, I'll try to recreate/replicate this behavior in a test project that is small, and I'll post it...

The problem is that when the dynamic called vi stops all references that he open invalid.

To see what I want to say, change the dynamics vi delay like 30 seconds before she stops, the savings loop works fine until the dynamics vi stops, then the error returns.

Mike...

Tags: NI Software

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