Why would you create a property node

[strider9315]

Hi,

I have been working with an instrument driver that deals extensively with property nodes. I have never worked with them before and their purpose is a bit unclear to me. What is the programming reasoning behind property nodes and what kind of applications are they useful for?

Thanks

[billko]

Right-click on any of the property nodes and select "Help For Property Node."  This is a very important LabVIEW concept.  It allows you to manipulate the properties of a control programattically.  For instance, you could change a control's enabled property to gray it out.

[edit]

Actually, it is called the "disabled" property.  Go figure.  😉

[/edit]

[crossrulz]

I'd have to see the code to see exactly what they are doing with it.  But Property Nodes can do all kinds of fun things.  They set/get the properties of a control/indicator, VI, VISA Session, DAQmx Task, DAQmx Channel, etc.  They are often abused to set the value to a control/indicator, which is not a proper way of using them.  The most common thing I do with property nodes is to disable and gray out a control to keep users from playing with a control when I don't won't them to.