When you call a function in a shared library, are copied locally settings?

I have a shared library with a function which the header is:

void __cdecl nextevent (double entry [], int32_t len);

When it is called it sends the values in [entry] to the input control:

This vi is compiled into a DLL that uses the header above.

Now, my question is: which of these operations is good:

1. the input control is a reference to the entry in array [], no value is copied.

2. the values of the Input [] array are copied into the input control, the local copy is used by the vi, then the values of the local copy is deleted/trimmed.

It seems reasonable that 1 is good, but I can't be sure, and I see no way to check.

For this particular case, option 2 is valid. The reason is that the tables of LabVIEW are not just pointers to a memory location but the handles. And there is no legal way to create valid LabVIEW handles of a runtime C allocated memory pointer. If LabVIEW transforms the table pointer entering a handle which is basically nothing else that allocate the handle with a sufficient size to contain all the data in the table and then copy the data from the table pointer in this handle. After the call, the handle is properly released.

Tags: NI Software

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