TestStand can not find that all exported DLL functions

Hi all

My problem is the following:

I have a DLL that I compile with Visual Studio with 40 functions. When I want to use this DLL in teststand, there are two missing functions. If I check with the dependency walker, the 2 missing function in teststand tool are well implemented.

The missing function prototype:

struct HModemBoardOpaqueType * mbCreateModemBoard (void)

Good function prototype:

enum UbtDllErrorCode mbDisconnectFromModemboard(struct HModemBoardOpaqueType *)

Is that possible that teststand does not structure opaque type correctly?

If I export my function type C (with extern C) no function is missing from the test bench

Thank you

What version of TestStand do you use? Older versions of TestStand only supported zero, digital and Boolean data types for the return values of the adapter of the dll. More recent versions of TestStand are now supported pointer/handle as well. New versions of TestStand I expect you can use such a prototype with the handle/pointer data type. However, if you want to convert this struct to an equivalent TestStand custom data type, you need to make a parameter instead of a return value, as the card does not support the conversion of struct for return values.

Basically returning a struct pointer this way (as return value) is dangerous in C/C++, because it is not possible to know who owns the memory. The type of pointer/handle allows you to do anyway, but it must be properly to maintain life of memory return you at a lower level (i.e. maybe with an exported function that uses the pointer who knows how free it).

Hope this helps,

-Doug

Tags: NI Software

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