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vrf VEE & VISA-COM

Question asked by VRFuser on Jun 27, 2005

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Hi VRF

Is there a way to trap events from a .NET or COM DLL in vee,
So that I can read a buffer each time it is full?

Regards

Henrik R. Jakobsen.

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VRFuser Jun 23, 2005 2:37 AM
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Hi Tobias,

A question to answer your question - why do you want to hook into VISA-COM from VEE? There are plenty of other hooks in VEE to talk to instruments (and they take a wide range of routes down through the IO).

Now, I may be proved wrong here, but I think you will find the VISA-COM presents a COM interface, i.e. it does not behave as an ActiveX Server or ActiveX control. Thus, I think this will preclude its (easy) use within VEE. I spent a week trying to get VISA-COM working with VBScript - to now avail. I reverted to an ocx that is supplied with the 34401 Intuilink software that enables you to hook into VISA-COM that way (gives you an HP-BASIC style relationship with your IO). But again, why would you want to do VISA-COM from VEE?

Hope this helps,

Andy

-----Original Message-----
From: HANNEMANN,TOBIAS (A-Germany,ex1)
[mailto:tobias_hannemann@agilent.com]
Sent: 23 June 2005 17:19
To: PDL-LISTS,VRF (A-Lists,unix1)
Subject: [vrf] VEE & VISA-COM

HI,
I am trying to use VEE PRO 7.51 together with VISA-COM but it won't work.
Has anyone ever used this together?
Could the one please send me a sample program, so I know how to get started with it?

Thanks,

Tobias

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VRFuser Jun 23, 2005 3:19 AM
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HI,
I am trying to use VEE PRO 7.51 together with VISA-COM but it won't work.
Has anyone ever used this together?
Could the one please send me a sample program, so I know how to get started with it?

Thanks,

Tobias

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VRFuser Jun 23, 2005 2:43 PM
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VRFuser Jun 23, 2005 4:29 PM
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Further info...

So iow there seems to be something wrong with your End Now button. Try using
pskill (I think that's the name). Hang on...

Yes - there's a link to pskill here:
http://www.oswegosw.com/SearchVRF.php?mi=6964

That was from 2002 though. If it's broken just google on pskill.
-SHAWN-

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VRFuser Jun 23, 2005 6:00 PM
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Hi Andy,

I know that they are many ways in VEE to talk to instruments. And that is also the reason why I am trying to do it also with VISA- COM. I am going to write example programms, which show how to talk to instruments with VEE using different libraries. (specially how to talk to N490X).

I allready managed to too use IVI- COM and VISA (the VISA32.dll) in VEE, but I have difficulties to do so using VISA- COM. There are VISA- COM interfaces available in VEE through .net support (with interop classes), but I even can't read the IDN string from the instrument. As mentioned recently, I can get a Ressource Manager Object and open an IVisaSession (so I am connected to the device), but I would need an IMessage (or any other similar Interface) to send an SCPI Command to the Instrument. In other languages it is easy done by doing a "typecast" from IVisaSession to IMessage, but this does not work for VEE.

I think there is a way to talk to instruments with VEE and VISA- COM. So, I am asking you and vrf users if they tried it and have an example programm.
I allready have a little VB6 example with VISA- COM. I can send it you if it would help you.

Hope you now understand why I try to use VISA- COM with VEE and what's the problem.

Regards,

Tobias

-----Original Message-----
From: STREET,ANDY (A-England,ex2) [mailto:andy_street@agilent.com]
Sent: Thursday, June 23, 2005 6:38 PM
To: PDL-LISTS,VRF (A-Lists,unix1)
Subject: RE: [vrf] VEE & VISA-COM

Hi Tobias,

A question to answer your question - why do you want to hook into VISA-COM from VEE? There are plenty of other hooks in VEE to talk to instruments (and they take a wide range of routes down through the IO).

Now, I may be proved wrong here, but I think you will find the VISA-COM presents a COM interface, i.e. it does not behave as an ActiveX Server or ActiveX control. Thus, I think this will preclude its (easy) use within VEE. I spent a week trying to get VISA-COM working with VBScript - to now avail. I reverted to an ocx that is supplied with the 34401 Intuilink software that enables you to hook into VISA-COM that way (gives you an HP-BASIC style relationship with your IO). But again, why would you want to do VISA-COM from VEE?

Hope this helps,

Andy

-----Original Message-----
From: HANNEMANN,TOBIAS (A-Germany,ex1)
[mailto:tobias_hannemann@agilent.com]
Sent: 23 June 2005 17:19
To: PDL-LISTS,VRF (A-Lists,unix1)
Subject: [vrf] VEE & VISA-COM

HI,
I am trying to use VEE PRO 7.51 together with VISA-COM but it won't work.
Has anyone ever used this together?
Could the one please send me a sample program, so I know how to get started with it?

Thanks,

Tobias

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VRFuser Jun 23, 2005 10:52 PM
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Hi Shawn!

The idea sounds good, but unfortunately I can't call QeryInterface.

Regards,
Tobias

> In other languages it is easy done
> by doing a "typecast" from IVisaSession
> to IMessage, but this does not work
> for VEE.

Well it may be possible if you can call QueryInterface through the IVisaSession interface. You'll need the interface id of IMessage, and the object heirarchies have to allow it.

msg = Create empty IMessage
ses = Create empty IVisaSession
Obtain IVisaSession interface
ses.QueryInterface(IID_IMessage, msg)
-SHAWN-

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