How to Pass TestStand Container with Enumerated Type as a C Struct?

Issue Details

I have a TestStand container with two properties - a number and an enum type:

I want to pass this container as a C Struct to my DLL. Assume DLL uses 1-byte packing.

My number layout is 32-bit signed:

However, my enumerated type can only be stored as Embedded Struct:

How to pass this struct to my DLL, specifically what should be the C Struct definition?

Solution

Follow the steps below:

1. Enable struct passing for the Enumeration itself. It is there that you set the numeric type that the Enumeration corresponds to.
2. Enable struct passing for the container and specify "Embedded Struct" for the Enumeration. This should cause the bits of the int (in your case) to be passed within the structure. (It seems a little weird, but an Enumeration is a named type. You will get similar behavior if you create a named Number and add it to your Container.)

Please confirm that the struct packing comes out correctly by inspecting the data within a C code module. You will want to set the value of the Enum to something like 0xdeadcafe to make sure the entire 32 bits are in the right place.