invalid lv client error

[smittywood]

I created a .Net interop assembly with LV2009 and added it to a Visual Studio 2005 VB.net project.  When I run the project I get a "Invalid LV Client" error when it calls one of the functions in the interop assembly.

Anyone got any ideas on this?

Thanks!

[Liam_A]

Hi there!

It may be one of a couple of issues.

Firstly, does your VI contain any dynamic loading of other VIs, and if so are they set to be always included - essentially a missing dependency?

If this does not move any distance to solving the issue, could you let me know what OS you are using please.

[smittywood]

As far as I know this doesn't call any dlls.  This is running on Windows XP SP3.  It's the Eurotherm 35xx instrument driver package found on the NI instrument drivers site that I converted over to an interop assembly.

Thanks

[Liam_A]

Hi there again!

Which version or versions of LabVIEW are you running or have you installed on the machine previously?

I will continue to look into this in the meantime.

[smittywood]

I have 6.1, 8.5.1, 2009 SP1, and 2010 installed.

[Liam_A]

Are these all 32 bit or do you have 64 bit installed also?

[smittywood]

32bit only

[Liam_A]

Is this error occuring on the computer that you have created the .NET on or another, and do you have the NI VISA Run-time engine?

[smittywood]

This has not been deployed yet - so yes, the error happens on the dev pc.  I have everything installed that comes with the developers suite.  NI Visa RT 4.6.1 is installed.

[Liam_A]

Hi there,

Here are a couple of things that you could perhaps try to resolve this issue.

Below is the Help link on how to build a .NET Interop,

http://zone.ni.com/reference/en-XX/help/371361F-01/lvhowto/building_a_net_assembly/

it might be a case of making the .NET interop again following the guidance above ensuring every function prototype is properley defined, as this may cause a problem.

Otherwise, you could use the Driver export wizard in LabVIEW 6.1, this is no longer included since LabVIEW 8.2.

Please let me know if this helps!