Create Different Instances of a Class

[Ben]

Gotcha warning!

Do not make the template part of the class. It MAY work in the development environment but in an exe LV does NOT concider the clone a member of the class so all private and protected methods can not be used.

Been there done that.

Ben

[Suneel]

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@Ben wrote:

If I understand you correctly yes a method will act on the Class instance in the wire it is passed. Provided the class instances are unique. 

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Hi Ben

I have the following situation. I have a Graph Class consisting of a method with Graph Display as one method. I have a button(s) which when clicked will Create an instance of the class and Call the Graph Display method. Now, when i first click the button, the Graph Display launches. But when i Click on the button again it throws an error saying the "The VI is not in a state compatible with this operation."

I have attached an example of the same. In the example, i have created two static instances of the Graph Class. I have two buttons in the Front Panel each launching a different instance in a event structure.

Thanks and Regards

Suneel

[Ben]

Did that link to my image library not work for you?

The last image in the series I posted for you is shown below but larger.

If you look at where I have included the comment "Open a re-entrant clone to use as an instance of the specified object" you will see I am using a switch to load the instance as re-entrant.

From the error message you reported I suspect the first instance is not being loaded and run as re-entrant so when you attempt to run load the second instance it opens a ref to the the first (after all it is NOT re-entrant) and an attempt to run an already running VI is a "right out".

If you want to get a better idea of the mind-blowing factors involved in re-entrancy and a simple example that was discussed at length by the community then please review my Nugget on Using Occurences that can be found here. It includes a zip of the code used in that Nugget and the topic of re-entrancy what beat to death.

BTW: I don't think LVOOP is your issue here. Using LVOOPish words in your question is limiting the potential number of readers/responders.

I hope that helps,

Ben

[Suneel]

Hi Ben

I got, it worked. I had missed the reentrant option setting while calling the vi dynamically.

Thanks and Regards

Suneel