sizeof(container)?

[RJM]

Hi, I have to interface TS directly to a DLL supplied by a third party. As part of the DLL call interface, structures(containers) are passed back and forth.

I have built type for the structures and set them up as C++ structures. Howeverm the interface also wants the sizeof() the structure itself not just a pointer to it.

In C, I always used sizeof(structname). How do I get the container (structure) size from TS?

rjmiller

[Scott_Richardson]

To rjmiller -
TestStand has no way of reading the header file and knowing this. sizeof() only works within C/C++. You will have to determine this manually or add the line of code to a function call and see what it returns.

Scott Richardson (NI)

[RJM]

Thanks Scott. Can TS determine the sizeof a TS container?

rjmiller

[Scott_Richardson]

To rjmiller -
A TS container is an object which can have references to other objects, so there is not way to determine a size because it is not continuous in memory.

If the object is a type and structure packing settings for the type are specified, TestStand knows how to pack and unpack the object data into a struct parameter of that type.

I guess the struct passing settings dialog box could display what it thinks that the corresponding size is for the struct, but it currently does not do this.

Scott Richardson (NI)

[RJM]

That would be a very nice enhancement, especially with the packing rules being applied. I just got caught simply counting bytes and forgetting the packing rules and ended up writing a little C routine which returned the sizeof() the structures I was interested in - OK when you have the compiler I guess (:-

rjmiller

[R1M]

Hello, Any change with the lasts versions of TestStand?