Using NIGLOBAL.BAS AND VBIB-32.BAS IN VB6

[Steven Hedgepeth]

I downloaded the sample programs and successfully ran DMMSimple
(Simple.vbp). Using the same functions that are used in DMMSimple,
ildev, ilclr, ilwrt and ilrd, I am unable to duplicate the success of these
functions using a program written with VB6. Should I use VB5 only when
I use these functions?

[gpibtester]

You should be able to use ildev, ilclr, ilwrt, and ilrd in a Visual Basic
6.0 application without any problems. What sort of problems are you having?

Liz

"Steven Hedgepeth" wrote:
>>I downloaded the sample programs and successfully ran DMMSimple>(Simple.vbp).
Using the same functions that are used in DMMSimple, >ildev, ilclr, ilwrt
and ilrd, I am unable to duplicate the success of these>functions using a
program written with VB6. Should I use VB5 only when>I use these functions?

[Steven Hedgepeth]

The following code results in the DMM displaying the "remote" message but
the
return I receive for ValueStr is "" instead of the expected "Fluke, 45, 1234567,
x.x, Dx.x":
' The application writes the text in DMMCommand to the multimeter.
ilwrt Dev%, DMMCommand.Text, Len(DMMCommand.Text)
If (ibsta And EERR) Then
Call GPIBCleanup("Unable to write to device")
End If

' The application reads the ASCII string from the multimeter into
' the ValueStr variable.
ilrd Dev%, ValueStr, Len(ValueStr)
If (ibsta And EERR) Then
Call GPIBCleanup("Unable to read from device")
End If
Thank you for your help.


"Liz" wrote:
>>You should be able to use ildev, ilclr, ilwrt, and ilrd in a Visual Basic>6.0

application without any problems. What sort of problems are you having?>>Liz>>"Steven
Hedgepeth" wrote:>>>I downloaded the sample programs
and successfully ran DMMSimple>(Simple.vbp).> Using the same functions that
are used in DMMSimple, >ildev, ilclr, ilwrt>and ilrd, I am unable to duplicate
the success of these>functions using a>program written with VB6. Should
I use VB5 only when>I use these functions?>

[Steven Hedgepeth]

Oops, silly me. After I initialize ValueStr (ValueStr = Space(40)), it works
correctly. When will I ever learn?

"Steven Hedgepeth" wrote:
>>The following code results in the DMM displaying the "remote" message but>the>return
I receive for ValueStr is "" instead of the expected "Fluke, 45, 1234567,>x.x,
Dx.x":> ' The application writes the text in DMMCommand to the multimeter.>
ilwrt Dev%, DMMCommand.Text, Len(DMMCommand.Text)> If (ibsta And EERR)
Then> Call GPIBCleanup("Unable to write to device")> End If>>
' The application reads the ASCII string from the multimeter into> '
the ValueStr variable.> ilrd Dev%, ValueStr, Len(ValueStr)> If (ibsta
And EERR) Then> Call GPIBCleanup("Unable
to read from device")>
End If>Thank you for your help.>>>"Liz" wrote:>>>You
should be able to use ildev, ilclr, ilwrt, and ilrd in a Visual Basic>6.0>application
without any problems. What sort of problems are you having?>>Liz>>"Steven>Hedgepeth"
wrote:>>>I downloaded the sample programs>and successfully
ran DMMSimple>(Simple.vbp).> Using the same functions that>are used in DMMSimple,
>ildev, ilclr, ilwrt>and ilrd, I am unable to duplicate>the success of these>functions
using a>program written with VB6. Should>I use VB5 only when>I use these
functions?>

[gpibtester]

Steven,

Congratulations of figuring out the problem! Yeah, it looks like you ran
into one of those gotchas with Visual Basic where you need to set aside space
for a buffer in Visual Basic before calling the ibrd (or ilrd) call.

If you run into problems like this again, you might check out the following
web page:

http://www.ni.com/support/gpib/langint/qth.htm

It has answers to some of the common questions like yours ("Why does the
read operation return an empty buffer?").

Regards,
Liz

"Steven Hedgepeth" wrote:
>>Oops, silly me. After I initialize ValueStr (ValueStr = Space(40)), it
works>correctly. When will I ever learn?>>"Steven Hedgepeth"
wrote:>>>The following code results in the DMM display
ing the "remote" message
but>the>return>I receive for ValueStr is "" instead of the expected "Fluke,
45, 1234567,>x.x,>Dx.x":> ' The application writes the text in DMMCommand
to the multimeter.>> ilwrt Dev%, DMMCommand.Text, Len(DMMCommand.Text)>
If (ibsta And EERR)>Then> Call GPIBCleanup("Unable to write to
device")> End If>> > ' The application reads the ASCII string from the
multimeter into> '>the ValueStr variable.> ilrd Dev%, ValueStr, Len(ValueStr)>
If (ibsta>And EERR) Then> Call GPIBCleanup("Unable to read from
device")> > End If>Thank you for your help.>>>"Liz"
wrote:>>>You>should be able to use ildev, ilclr, ilwrt, and ilrd in a Visual
Basic>6.0>application>without any problems. What sort of problems are you
having?>>Liz>>"Steven>Hedgepeth"> wrote:>>>I downloaded
the sample programs>and successfully>ran DMMSimple>(Simple.vbp).> Using the
same functions that>are used in DMMSimple,>>ildev, ilclr, ilwrt>
and ilrd,
I am unable to duplicate>the success of these>functions>using a>program written
with VB6. Should>I use VB5 only when>I use these>functions?>