ObjCreate failing on some COM objects

[fritsbrasmussen 0]

Trying to access Agilent VISA-COM object(s) with this code:

$oRM = ObjCreate("VISA.GlobalRM")
;$oRM = ObjCreate("shell.application") ; OK
;$oRM = ObjCreate("IVIConfigServer.IVIDriverSession") ; OK
;$oRM = ObjCreate("AgilentRM.SRMCls")
;$oRM = ObjCreate("AgM918x.AgM918x")
;$oRM = ObjCreate("AgilentGPIB.GpibSvr")
Msgbox(0,"RM", "Obj: " & IsObj($oRM) & "  Err: " & @error)

$oINSTR = ObjCreate("VISA.BasicFormattedIO")
Msgbox(0,"INSTR", "Obj: " & IsObj($oINSTR) & "  Err: " & @error)

$oINSTR.IO = ObjCreate($oRM.Open("GPIB0::22"))
Msgbox(0, "IO", "IO: " & IsObj($oINSTR.IO) & "  Err: " & @error)

I get

IsObj($oRM) = 0 and & @error = 0

IsObj($oINSTR) = 0 and  @error = 0

$oINSTR.IO = ObjCreate($oRM.Open("GPIB0::22")) generates this AutoIt error

$oINSTR^ERROR

Error: Variable must be of type "Object"

so apparently oRM and oINSTR are not objects.

When I view the Agilent Visa COM object(s) with OLE/COM viewer there is no reference to a Typelib.

Could this be the cause, and if so is the any way to circumvent?
 

Thanks for any help

Frits B Rasmussen

Edited July 4, 2013 by fritsbrasmussen

[water 1,847]

To get detailed information about COM errors I suggest to add a COM error handler.

Please check the help file for ObjEvent.

[fritsbrasmussen 0]

Thanks MVP,

First error reported by errorhandler is: 0x80004002 'No such interface supported'

I am afraid this still leaves me in the dark not being an expert on COM objects.

I got a Visual C# recipe:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Ivi.Visa.Interop;

namespace TG1B1A_VISA_demo

{

class Program

{

static void Main(string[] args)

{

// resource manager and message-based session manager

ResourceManager rMgr = new ResourceManagerClass();

FormattedIO488 src = new FormattedIO488Class();

FormattedIO488 BERT = new FormattedIO488Class();

(end of code excerpt)

Can this in any way be translated to AutoIt?

Regards

Frits B Rasmussen

[water 1,847]

The help file describes that AutoIt version 3.3.8.1 only supports the IDispatch interface.

"AutoIt uses the IDispatch interface for automation. This interface 'exposes' all scriptable methods and properties that the object supports. If it does not exist, you can't use the object in an AutoIt script."

A lot of things have changed with the latest beta. But unvortunately I'm not too familiar with COM.

[fritsbrasmussen 0]

From VPP-4.3.4 Visa Implementation Specification for COM it appears that IUnknown interface is needed,

so this is about as far as I get I suppose.

Thanks for your assistance.

Frits

[water 1,847]

The latest beta has a new feature to implement interfaces: ObjCreateInterface.