Panel Properties - Some available, some not? - SOLVED

[spiffo-smith]

This one has gone me perplexed, if I add some simple script to a button like below:

local myChannel = tostring(panel:getProperty("panelMidiOutputChannelDevice"))
console("MIDI Ch is "..myChannel)
local version = tostring(panel:getProperty("panelVersionMajor"))
console("Version Major is "..version)
local delay = tostring(panel:getProperty("panelMidiGlobalDelay"))
console("Global Delay is "..delay)
local thruH2H = tostring(panel:getProperty("panelMidiThruH2H"))
console("H2H is "..thruH2H)
local thruH2D = tostring(panel:getProperty("panelMidiThruH2D"))
console("H2D is "..thruH2D)
local thruD2H = tostring(panel:getProperty("panelMidiThruD2H"))
console("D2H is "..thruD2H)
local thruC2D = tostring(panel:getProperty("panelMidiThruC2D"))
console("C2D is "..thruC2D)
local thruD2D = tostring(panel:getProperty("panelMidiThruD2D"))
console("D2D is "..thruD2D)

I get values returned for the Output Channel, the Version Major and the Global Delay but all the MIDI Thru Properties just return nil

I'd like to be able to read and change certain MIDI Thru settings without overly confusing someone with the Main MIDI Settings Menu which imho is confusing. But it looks like some Panel Properties are available and others are not?

[dnaldoog]

Hi Spiffo,

Try this:

local myChannel = L(panel:getPropertyString("panelMidiOutputChannelDevice"))
console("MIDI Ch is "..myChannel)
local version = L(panel:getPropertyString("panelVersionMajor"))
console("Version Major is "..version)
local delay = L(panel:getPropertyString("panelMidiGlobalDelay"))
console("Global Delay is "..delay)
local thruH2H = L(panel:getPropertyString("panelMidiThruH2H"))
console("H2H is "..thruH2H)
local thruH2D = L(panel:getPropertyString("panelMidiThruH2D"))
console("H2D is "..thruH2D)
local thruD2H = L(panel:getPropertyString("panelMidiThruD2H"))
console("D2H is "..thruD2H)
local thruC2D = L(panel:getPropertyString("panelMidiThruC2D"))
console("C2D is "..thruC2D)
local thruD2D = L(panel:getPropertyString("panelMidiThruD2D"))
console("D2D is "..thruD2D)

[dnaldoog]

If you run this code:

console("type(1) = "..type(1))
console("type(\"hello world\") = "..type("hello world"))
console("type(true) = "..type(true))
console("type({}) = "..type({}))
console("type(mod) = "..type(mod))
console("type(panel:getPropertyString(\"panelMidiThruH2H\") = "..type(panel:getPropertyString("panelMidiThruH2H")))

you get:

type(1) = number
type("hello world") = string
type(true) = boolean
type({}) = table
type(mod) = userdata
type(panel:getPropertyString("panelMidiThruH2H") = userdata

So the last two type are userdata.

To parse a string contained in userdata that an object method like getPropertyString() returns, you need to surround the returned string with L() - not sure why though, but it must be a way of formulating the userdata to be acceptable for lua or Ctrlr!

[spiffo-smith]

So the L() is a Ctrlr specific thing?

[dnaldoog]

So the L() is a Ctrlr specific thing?

Yes it must be, but I can't find it in the source code. Can you?

[damiensellier]

@dnaldoog I saw that already. it's a class for LUAbind it refers to wrapForLua (L)

ctrlr/Source/Lua/JuceClasses/LCore.cpp

Line 10 in 8aa00d8

void LExpression::wrapForLua (lua_State *L)

From the luaBind doc https://luabind.sourceforge.net/docs.html:
Everything that gets registered in lua is registered in a namespace (lua tables) or in the global scope (called module). All registrations must be surrounded by its scope. To define a module, the luabind::module class is used. It is used like this:

module(L)
[
	// declarations
];

[dnaldoog]

Thanks Damien!!

[dnaldoog]

Also this from Possemo https://ctrlr.org/forums/topic/whats-the-difference-here/#post-83092

[spiffo-smith]

OK, thanks everyone, that's as detailed as it needs to be for me, all a bit confusing, especially since sometimes you need it and sometimes you don't!