Configuring Call Library Function, function prototype

[Candice]

Hey everybody,

I'm getting some weird garbldygook in my function prototype in the Call Library Function configuration window:

 

My function is void Norm(...)

Anybody know where these extra symbols are coming from?

Thanks in advance.

Message Edited by Candice on 06-25-2009 01:31 PM

[JeffL]

Hi Candice,

If you delete the node, drop a new one, then set it up again, does it have the same problem?

[smercurio_fc]

It appears you are dealing with a C++ DLL. LabVIEW does not handle C++ DLL. It can only handle C DLLs, or at the very minimum, you need to adorn each prototype with extern "C". This is discussed in Step 3 of this document: Building a DLL with Visual C++.

[Candice]

My prototype does include the extern "C" statement.

[smercurio_fc]

The bottom line is that whatever compiler you are using is adorning the function names. That function is being seen as a C++ function, and LabVIEW cannot call it. You need to look at the documentation for your compiler on how to prevent this. This KB article is old, but it still applies (see section "Function Name is Decorated).

[Candice]

I was told that while labview cannot call C++ functions, I can still write in C++ using only C callable functions and Labview can use it. Is this true or false.

btw, the mangling on the prototype "magically" fixed itself, after closing out of labview and restarting 😕

Message Edited by Candice on 07-02-2009 12:03 PM

[smercurio_fc]

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Candice wrote:

I was told that while labview cannot call C++ functions, I can still write in C++ using only C callable functions and Labview can use it. Is this true or false.

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As long as the interface that LabVIEW sees is C then yes, that's generally true.

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btw, the mangling on the prototype "magically" fixed itself, after closing out of labview and restarting 😕

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That's just bizarre.

[Candice]

Yes, because nothing is ever magical. I just can't see the reason for it 😞