invoke nodes no methods

[juanni]

As previous users have noted, the invoke nodes functions are not working on my VI after upgrade to labview 8.2.  I previously used these VI's with labview 7 w/o any problem.  I can do as has been suggested and switch methods, causing the nodes in the main vi to work, but when I try to do this for sub-vi nodes, I get a greyed out "no methods" message.  What gives?  Jonathan

[Kallis]

Which methods are you looking for?

[juanni]

I am very new to Labview.  I am not sure what the methods are... I am trying to modify a program provided to me by Horiba-Jobin Yvon, and used to control one of their monochromators via USB.  Thus, I don't know what the methods are or from whence they come.  All I know is that I place a node, select class (activex), and the options that I seek suddenly appear.  It also seems that if I just reselect the type of local going into the original nodes, the problem can be solved even more simply. 

[Kallis]

OK, so what exactly is (was?) the problem?

[juanni]

I upgraded labview, and suddenly my monochromator control vi doesn't work.  I check the errors, and there are a bunch of errors saying "invoke node: invalid method" and "invoke node: invalid refnum class".  I assume that this is activex lingo that is beyond my 'turn the light on/off' knowledge of labview.  I seem to have blundered my way through that problem.  Now, I can't figure out how to make my little ni usb daq board work.  aargh. 

[Kallis]

Can you post the VI (or part of it)? Check out the example programs to know how to get USB DAQ to work with LV 8.2.

[NathanT]

Which USB DAQ device are you using?

NathanT

[alexandrehardt]

Hello!

I am having the same problems.

I was trying to open an .IOD from Catman (HBM) using an example VI (LV Open_IOD.vi) that I got from the guys from HBM. When I open the file, everything seems fine, but the VI doesn't work. The error messages are:

invoke node: invalid method
invoke node: invalid refnumclass

I using LV 8.2. Does anybody have an idea?
Thanks a lot!

[juanni]

You have to right click the reference (the upper blue green boxes that input into the nodes), go to "select item" and then select the appropriate option.  In my case, I had to select "mono refnum". This will automatically reset the nodes attached to the reference as well.  Does this help? 

[alexandrehardt]

Oh yeah! That did solve the problem! Thanks a lot!

Alexandre