How to invoke COM DLL from Forte

Is there a sample available for C wrapper for COM Methods ?

Talking to a COM object from Forte is possible if the COM object uses apartment model threading. Anything else and you will have problems.
Refer to the "Integrating with windows and macintosh" manual and the chapter on OLE integration. COM is just OLE with extras. DCOM is just COM/OLE with remote support. Microsoft likes to put fancy names on old tech.
You will need to use the olegen program supplied with forte to generate a forte supplier plan that wraps the COM object. Then you can use the forte objects just like a COM object.
Be aware though that COM has a number of limitations that you must be carefull of. You MUST talk to the COM object using the same thread that you created the COM object in. Don't initialise in the Init method and then call it from somewhere else (Service object Init methods are run from a different thread).
It is useally safest to single thread all access to the object.

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here I'm attach my Vi and really hope someone willing to help.
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Attachments:
bodeplot.vi ‏1049 KB

On Sep 17, 6:40 am, cckoh <[email protected]> wrote:
> Dear all expert,
> I'm a student and very new in Labview programming.
> Currently i have build a simple vi and need to convert it to dll so that i can call it from my VB.net. But the problem is how to call the labview dll from my VB.net?
>  
> I know we must declare function something like this,
>  
> Auto function Bodeplot Lib"..\\Bodeplot.dll" (Byval Val1 as double, Byval Val2 as double,...) as double
>  
> but how to determine Val1, Val2 (and so on) is input for which data?  if my vi have 10 input (frequency, Kc,Fcz,Fcp,Wzrhp,Wp,k,Wz,Beta and Operation) ? and how to select the output (my application have 3 possible output : magnitup loop,phase loop, and degree loop)
>  
> In addition, since I'm using Labview 8.0 , and as i know apllication  builder for this version cannot convert vi to dll which contain Mathscript (but unfortunely, my vi all use Mathscript), so really hope someone can help me to convert my vi to dll using Labview 8.2 (which remove this limitation).
>  
> here I'm attach my Vi and really hope someone willing to help.
>  
> Thank you.
>  
>
> bodeplot.vi:http://forums.ni.com/attachments/ni/170/272124/1/bodeplot.vi
If you insist on using Labview with your project then you should
consider using ActveX in place of using a dynamic link library to
interface to your VB.net code. You don't need "Application Builder"
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of Labview for Windows come with ActiveX capability. For more
information on ActiveX look up the subject ActiveX in Labview's Help
File.
Howard

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