A problem about calling Labview vi in VB

[hanwei]

Hi all:

I meeting a problem about data transfer and parallel operation between VB and Labview.

Actually, I want develop a VB program, in which, the Labview VI can be called and corresponding parameters can be transferred to Labview. and then, I also can operate my system by VB program at same time. something like parallel operation (VB and Labview program).

 But the question is :

1.   If I use "Call" method of ActiveX in VB,  and the LabVIEW subvi is not stopped (for example, a loop structure), I can not do  parallel operation on VB program. The error message is "other application is busy" which is attached below. The sample codes is also attached.

2.   I tried to use other methods like "OpenFrontPanel" and "Run", but I am not sure how to transfer the parameter??

3.  Then I tried to use "SetControlValue" to set the parameters, but there is a error " := expected", which is very strange, because the statement  I wrote is followed with the help documents [ eg: VI.SetControlValue ("string", value)], why it is still need a "=" ??

Does anybody know something about it? Thanks a lot

Message Edited by hanwei on 11-07-2008 03:18 PM

[hanwei]

anybody can help me?

I really appreciate your time

[hanwei]

nobody knows it??

[Claire_Reid]

Hi,

I saw that no one had posted a reply yet, so hopefully this will start some activity on this forum. Have you seen the DevZone article Calling LabVIEW as an ActiveX Server from Visual Basic? Take a look at this and let me know if this helps you at all.

[Julia2013]

Hi:

Did you put a while loop in your labview VI?

Because the loop will only pass parameters out when the loop has stopped.

I encountered the same problem with a while loop in my VI,

but solved as soon as I removed the loop.

[Yamaeda]

I sure hope OP has solved it by now. 🙂

/Y