how do i pass session handlers to test stand?

[ObiCaban]

I tried the examples, but couldn't learn anything useful.

I have a DLL from LabWindows/CVI of the following and I'm able to use (select) the DLL functions in Action Steps in TestStand.

int DLLEXPORT OpenSession (unsigned long *session, signed long *ErrorCode, char *ErrorMessage)
{
 
 *session = fnThatReturnsInt(0,OPT1,1,1);

 
 return 911;
}

int DLLEXPORT CloseSession (unsigned long sessionHandle, signed long *ErrorCode, char *ErrorMessage)
{

 deviceSessionCloserFn(sessionHandle, 0);
 
 return 912;
}

The C tester works excellent. How do I tell TestStand to store/use that session in following Action Steps from the same DLL?

Many thanks!

[ObiCaban]

Feeling more like Mr. Edison... "I have not failed. I've just found 10,000 ways that won't work."

Any guidance in the right direction or outright solution is 10000x appreciated!

[RayFarmer]

In LabVIEW there are two function to pass a session to teststand and back again called "Session to RefNum" and "RefNum to Session". Cannot remember if you have something similar for CVI. You can look in the Utilities library.

[Luke_W · Accepted solution]

Hey ObiCaban,

Is it possible to pass in the session 'By Reference' as a parameter in the module settings of TestStand? 

Kind Regards, 

Luke W

[ObiCaban]

Checking both answers... Will let you know. Thanks!

[ObiCaban]

It is as easy as passing the referernce! Thanks!

I was doing it wrong. One has to make sure the session is being handled correclty in the dll.

Then, in TestStand one passes the session reference (aka pointer) as a PARAMETER variable. In my case it was a numeric reference. It ended up being something like "Parameter.session", Number (by reference)

I called the DLL function that assigned the value to the session before calling the other functions, of course.

Thanks, all!

Please forgive my ridiculous delay to reply back.