help getting info panel plugin to work
 

I am trying to learn how to do some very basic lua coding. I successfully got one plugin to work(Anymeter= I am still testing it but it seems to work good).

I copied and modified a layout.lua file for my LDB display. It shows my info blocks and does not have any errors. If I create a frame like this.

local cp = CreateFrame("Frame","cp_frame")
cp:SetFrameStrata("BACKGROUND")
cp:SetPoint("TOPLEFT", UIParent, "TOPLEFT", 0, 0)
cp:SetWidth(900)
cp:SetHeight(15)
cp:SetScale(1.2)
cp:SetBackdropColor(0, 0, 0)
cp:SetClampedToScreen(true)
cp:EnableMouse(true)
cp:Show()

Now the problem. When I modify my nUI InfoPanel Plugin.lua code to try and re parent the frame to the info panel it gives an error. Attempt to index global cp_frame (a nil value). Both lua files run fron the same folder\TOC

layout.lua
plugin.lua

My plugin.lua relevent sections

plugin.setEnabled = function( enabled )

if plugin.enabled ~= enabled then

plugin.enabled = enabled;

cp_frame:ClearAllPoints ();
cp_frame:SetPoint ("TOPLEFT", plugin.container, "TOPLEFT", 0, 0);

end
end

-------------------------------------------------------------------------------

plugin.setSelected = function( selected )

if selected ~= plugin.selected then

plugin.selected = selected;

if selected then

cp_frame:Show ();

else

cp_frame:Hide ();

end

end
end

I hope I have given enough info here if not just ask. Thanks for trying to help me understand lua.

If it is all in the same file, then you can use the local variable "cp" instead of the global "cp_frame"

If the frame is being created in one file and accessed in another, you can access it like this...

local cp_frame = _G["cp_frame"];

which looks in the global table for the global variable named "cp_frame"

This got me a little farther
 

I have been reading wowwiki and looking through other addons. I am still having trouble with this thing.
I get an error saying show is a nil value when the addon creates the panel or when I hit the button and the panel changes I get a hide is a nil value.
So it seems to be close.
Thank You for your help and patience.

Why don't you post the code you have at present as an attachment in this thread, then we can look at the code and see where you're going wrong.

ok here is the layout and infopanel is in attachment
 

layout lua

-- Create the Frame
local cp = CreateFrame("Frame","CargoPanel_Frame");
cp:SetPoint("CENTER",UIParent,"CENTER",0,0);
cp:SetWidth(250);
cp:SetHeight(25);
cp:SetAlpha(1.0);

local rep = cargoShip("|cffffb366Ara|r Reputations")
rep:SetPoint("TOPRIGHT", CargoPanel_Frame, "TOPRIGHT", 0, 0)


I get my layout without an issue.
I get it to be moved to the infopanel.
I get an error message when it trys to show the panel.
.UI_InfoPanel_CargoPanel\nUI_InfoPanel_CargoPanel.lua:137: attempt to call method 'show' (a nil value)

Thank You again

Ah, you need to redefine CargoPanel_Frame in each function you want to access it in as they are local to the function unless you set it outside the function.

Thank You. It is now working
 

Here is a SS of the infopanel in action. I have moved a few items out of Fortress and into my new LDB display info panel.
I am learning and thanks again for the help.