What type of component do Labview developers prefer? COM/ActiveX, C++ DLL, C DLL?

The last time I used Labview was about 5 years ago and I have not kept
up with the changes.
I assume Labview can use COM components, ActiveX (COM with a GUI), C
DLL's, and possibly C++ DLLs. Of these types, which do Labview users
prefer?
Background
I need to develop a component that can be used by both VB and Labview
users.

Ed,
LaBVIEW can use COM/ActiveX components, C dll's and C++ dll provided that the c++ dll has direct function calls(you can always use a wrapper dll to call functions inside a class)
As far as what labVIEW users prefer, this is kind of a difficult question to answer since it is mostly dependant on the users knowledge of each of those components.here are a few links that may interests you.
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/5401be584fbaeece862567c2006d36c7?OpenDocument
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/7f41004ee990d4da86256a9d0064d522?OpenDocument
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/3a1f4b7cbc68b636862567cc004d5cca?OpenDocument
and more gener
ally
http://zone.ni.com/devzone/devzone.nsf/webcategories/4161F118BF99CCE686256AB7006A68EB?opendocument&node=DZ53001_US
Regards,
Cyril Bouton
Applications Engineer
National Instruments
Cyril Bouton
Active LabVIEW Developper

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"getOutput" method - to correspond with your
value binding expression in the page:
#{esriWolDSS.output}
It would be helpful to see the contents of this method
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-rogerI do have corresponding methods like:
ArrayList output;
//output
public void setOutput (ArrayList al)     { this.output = al; }
public ArrayList getOutput()          { return this.output; } in the bean;
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<w:multiline width="400" height="300" title="Simulation Results"
xlabel="Years" ylabel="Results"
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[email protected]
"Rolf" wrote in message news:...
> A LabVIEW file refnum is an internal Magic Cookie to LabVIEW and there is no
> way to directly extract the actual information assigned to that Magic
> Cookie.
> However the CIN Reference Manual describes one function which allows to
> retrieve a lower level "File" handle and at least on Windows 32 bit and
> LabVIEW
> from version 5 up to and including 6.1 this "File" LabVIEW datatype directly
> maps
> to the Win32 API "FILE" Handle.
>
> The function to use is
>
> MgErr FRefNumToFD(LVRefNum refNum, File *fdp);
>
> It is declared in extcode.h or one of its dependant headers and exported
> from "labview.lib"
> all located in the cintools directory and you can link this lib also to a
> normal DLL project.
> However calling this DLL then from any other process than LabVIEW or a
> LabVIEW
> executable will not initialize the DLL anymore correctly.
>
> Your best option if you need to write in C(++) should be to use the LabVIEW
> file manager
> functions described on the External Code Manual (manual/lvexcode.pdf) on
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> that although currently
> the "File" in the LabVIEW file manager functions matches the FILE in Windows
> 32 bit API
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> LabVIEW version
> may actually use a different datatype for its "File" parameter to the
> LabVIEW file manager calls
> and your use of assuming File == FILE may simply crash.
>
> Also operating on a file refnum in LabVIEW which has been accessed directly
> with Win API
> functions may result in strange behaviour such as the file read/write mark
> not being updated as
> you would maybe expect it.
>
> "Jo" wrote in message
> news:50650000000800000016520000-1023576873000@exchange.ni.com...
> > How can I pass a file refnum into and out of external c++ code? What
> > type does it convert to in c++?
> >
> > I am trying to write external c++ code that will read a file already
> > opened by Labview and therefore assigned a refnum. (Unfortunately, I
> > definately can't use the standard Labview vis.) However I am not sure
> > what c++ type to use in order to manage the refnum.
> > All help and thoughts appreciated. Thanks,
> > Joanna

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What type of component do Labview developers prefer? COM/ActiveX, C++ DLL, C DLL?

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