Changing a .net constructor node with VI Scripting?

[BertMcMahan]

I'm trying to make a tool to generate wrappers around a specific .NET dll.

I created the node, then tried writing the property Constructor Node Class Name. I got error 1113, "LabVIEW: (Hex 0x459) Internal Error. The external object class was not found."

So, I manually made a node then read that property- aha, I need to add ".NET:" to the beginning of the method name; all well and good.

So, now I can write the property with that name and it works... until I go to write a different name.

Long story short, I seem to be able to write a type to a Constructor Node if I've manually set that node to that type before.

In other words, say my .NET assembly has methods A/B/C/D/E. If I manually set my constructor node to Method A, then B, then C, VI scripting lets me change it to A, B, and C, but not D or E. If I manually configure it to method D, now I can change it to A, B, C, and D, but still not E, until I manually configure it to E- then I can do whatever.

Any tips on getting this to work? I'm using "Assembly.LoadFrom" then "Assembly.GetTypes" to get a list of all Types. I thought this would pull the whole assembly into memory but it appears I'm not understanding something. 

[paul_a_cardinale]

Well, you're ahead of me.  I can't even create a property node for a contructor.

[raphschru · Accepted solution]

Hi Bert,

What about using private VI Server Application method ".NET > Load Assembly to ObjMgr" prior to scripting the constructor node?

See https://forums.ni.com/t5/LabVIEW/Scripting-a-NET-Constructor-Node-in-LabVIEW/m-p/4154118#M1198663

However, I haven't found a way to select a specific constructor implementation.

Regards,

Raphaël.

[BertMcMahan]

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@paul_a_cardinale wrote:

Well, you're ahead of me.  I can't even create a property node for a contructor.

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I "cheated" and just used a VI with one on there already as a template (not a .vit or anything).

@raphschru wrote:

Hi Bert,

What about using private VI Server Application method ".NET > Load Assembly to ObjMgr" prior to scripting the constructor node?

See https://forums.ni.com/t5/LabVIEW/Scripting-a-NET-Constructor-Node-in-LabVIEW/m-p/4154118#M1198663

However, I haven't found a way to select a specific constructor implementation.

Regards,

Raphaël.

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That did it, thanks a ton! I don't have the "which specific constructor do you want" issue so I can't comment there, but after calling the private VI you mentioned I can now set my constructor node to whichever specific constructor I need. Thanks for the tip!

[raphschru]

Creating the constructor node is easily done:

[paul_a_cardinale]

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@raphschru wrote:

Creating the constructor node is easily done:

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Here it is wrapped up in a callable VI.