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Set Combo Box Items

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Game Hacking Dojo
Master Cheater

Reputation: 1

Joined: 17 Sep 2023
Posts: 250

Posted: Tue Nov 26, 2024 10:02 am Post subject: Set Combo Box Items

How do I set items of a combo box to table items or directly insert an item?

#################

Okay, solved thank you

Code:

local combobox = createComboBox()
local table = {}

if table ~= {} then
for i = 1, #table do
combobox.items.add(table[i])
end
end

atom0s
Moderator

Reputation: 205

Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1

Posted: Tue Nov 26, 2024 3:24 pm Post subject:

Just a heads up, this is not a valid means of comparison in Lua:

Code:

if table ~= {} then

When you define a table by setting something to just {} (an empty table) this creates a new instance of a unique table object. For example:

Code:

local t1 = {};
local t2 = {};

This would create two separate instances of a table object into t1 and t2 respectively. However, they are not equal to the same thing, meaning doing:

Code:

if (t1 == t2) then

Would always be false.

Based on what you're showing in your main post, it looks more like you would want to check the length of the table instead. Such as:

Code:

if (#t1 > 0) then
-- add elements of table to the combobox..
end

_________________

- Retired.

LeFiXER
Grandmaster Cheater Supreme

Reputation: 20

Joined: 02 Sep 2011
Posts: 1069
Location: 0x90

Posted: Wed Nov 27, 2024 10:19 am Post subject: Re: Set Combo Box Items

Game Hacking Dojo wrote:

How do I set items of a combo box to table items or directly insert an item?

#################

Okay, solved thank you

Code:

local combobox = createComboBox()
local table = {}

if table ~= {} then
for i = 1, #table do
combobox.items.add(table[i])
end
end

In addition to what atom0s has said. I would like to point out that this code is very specific and will cause you to copy/paste for every situation where you want to add items from a table to a combobox. It would be better to do this:

Code:

-- Cleanup the form if it already exists
if exampleForm then exampleForm.destroy(); exampleForm = nil end

-- Define items for the combobox
local items = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '10' }

-- Create the form
exampleForm = createForm(getMainForm())
exampleForm.Name = 'frmMain'
exampleForm.Caption = 'Combobox Example Form'
exampleForm.Width = 300
exampleForm.Height = 100
exampleForm.Position = 'poDesktopCenter'

-- Create a label for the combobox
local cbItemsLabel = createLabel(exampleForm)
cbItemsLabel.Caption = 'Combobox Items:'
cbItemsLabel.Top = 20
cbItemsLabel.Left = 10

-- Create the combobox
local cbItems = createComboBox(exampleForm)
cbItems.Name = 'myCombo'
cbItems.Width = exampleForm.Width - 20
cbItems.Top = 40
cbItems.Left = 10
cbItems.Text = ''

-- Function to add items from a table to a combobox
local function addTableToCombobox(form, combobox, tbl)
local function getFormComponent(form, componentName)
if form == nil then error('Must provide a valid form.') end
for i = 0, form.getComponentCount() - 1 do
local component = form.getComponent(i)
if component.Name == componentName then
return component
end
end
error('Invalid component.')
end

-- Check if the table is valid
if tbl == nil or #tbl == 0 then error('Must provide a valid table.') end

-- Get the combobox component
local comboboxComponent = getFormComponent(form, combobox.Name)

-- Add the items from the table to the combobox
for i = 1, #tbl do
comboboxComponent.Items.add(tbl[i])
end
end

-- Add the items to the combobox, here I am passing the variable names, rather than the name of the component
addTableToCombobox(exampleForm, cbItems, items)

This way, you can add table items to any combobox on any form. I would highly recommend modular programming because it breaks down a program into smaller, manageable pieces, each handling a specific task. This makes the code easier to understand, maintain, and debug. It also allows for code reuse, faster development, and better collaboration among team members. By isolating functionality into separate modules, changes in one part of the code are less likely to affect others, improving overall efficiency and scalability. Just something I thought I should point out.

Game Hacking Dojo
Master Cheater

Reputation: 1

Joined: 17 Sep 2023
Posts: 250

Posted: Wed Nov 27, 2024 1:31 pm Post subject:

atom0s wrote:

Just a heads up, this is not a valid means of comparison in Lua:

Code:

if table ~= {} then

When you define a table by setting something to just {} (an empty table) this creates a new instance of a unique table object. For example:

Code:

local t1 = {};
local t2 = {};

This would create two separate instances of a table object into t1 and t2 respectively. However, they are not equal to the same thing, meaning doing:

Code:

if (t1 == t2) then

Would always be false.

Based on what you're showing in your main post, it looks more like you would want to check the length of the table instead. Such as:

Code:

if (#t1 > 0) then
-- add elements of table to the combobox..
end

Thank you for the feedback, I really appreciate it. fixed.

LeFiXER wrote:

Thank you for the tip. I try to work by that prioritising efficiency and readability.

This is what I needed this for:
https://forum.cheatengine.org/viewtopic.php?t=622886

Any feedback or criticism is apperciated.

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