Checking existence of function

Question

I was testing my channel on an older Roku running Firmware 3.1 and got this error

Member function not found in BrightScript Component or interface. (runtime error &hf4) in ...G56RN/pkg:/source/appMain.brs(98)
098: busydialog.EnableOverlay(true)

which leads to two questions.

1) Is there a way to check if an function is available before calling it? For example in javascript you could do this
if (busydialog.EnableOverlay) {
busydialog.EnableOverlay(true)
}

2) according to the docs (http://sdkdocs.roku.com/display/sdkdoc/ifMessageDialog) the EnableOverlay is listed as available since version 2.7. So why does it fail on a 3.1 box?

JesUltra · Answer

The global function&nbsp;FindMemberFunction is described to return "Invalid" if the function does not exist, or otherwise a reference to the interface defining the function.&nbsp; I do not know from what version&nbsp;FindMemberFunction is available, though.FindMemberFunction(object as Object, funName as String) As Interface

RokuKC · Answer

FindMemberFunction has been around for many years.&nbsp; To be exact, the old release notes in the SDK documentation says it was added in Roku OS version 6.1 - 12/04/2014.Generally speaking, for any function that is documented in the current SDK BrightScript reference without any annotation regarding it only being added in a recent firmware version, you can take its availability for granted.&nbsp;

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Checking existence of function

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