Console close feature

Idol1111222

Lets say we have a UI program with a console output button, when pressed, the console window opens, and when the same button is pressed in the main window, it closes.
How?

Samir

It's not possible for now to close a console programmaticaly once opened when using a Desktop app

Idol1111222

What about using C FFI?

Samir

Yes you can do it using FreeConsole(), but never tried it :

[Login to see the link]

Samir

Samir Don't hesitate to share if it works

Idol1111222

Thank you, i will look for it

Idol1111222

This should work:

local ui = require "ui"
local sys = require "sys"
local cmd = require "console"
local ffi = require "c"
local consoleshow = false
local c_kernel = ffi.Library("kernel32.dll")
local c_user = ffi.Library("user32.dll")

c_user.ShowWindow = "(ii)B" --       ShowWindow: arguments(int (HWND(intptr)));int hCmdShow);returns(int(BOOL))
c_kernel.GetConsoleWindow = "()i" -- GetConsoleWindow: returns(int(HWND))

local c_kernel_sw_hide = ffi.Value("int", 0)
local c_kernel_sw_show = ffi.Value("int", 5)

local function updateconsole()
  if consoleshow then
    c_user.ShowWindow(c_kernel.GetConsoleWindow(), c_kernel_sw_show)
    cmd.writeln("Console state: shown")
  else
    c_user.ShowWindow(c_kernel.GetConsoleWindow(), c_kernel_sw_hide)
    cmd.writeln("Console state: hidden")
  end
end
cmd.writeln("ConsoleToggleExample")
updateconsole()

local Window = ui.Window("WINDOW", "fixed",0,0)
Window.bgcolor = "15790320"
Window:center()
Window.x = Window.x - 128
Window.y = Window.y - 64
Window.width = 256
Window.height = 128
Window:show()

local console_button = ui.Button(Window,"Toggle console",80,48,96,32)
console_button.onClick = function()
  consoleshow = not consoleshow
  updateconsole()
end

while Window.visible do
	ui.update()
end

At first the console is hidden, but when you press the button it appears.
The functional part is only the updateconsole() function.

Samir

Great work and glad to C module in action.
What do you think about this FFI module?

Idol1111222

I think this is a great module, you need to update the documentation because not everything is described yet and add this module to static exe programs if its possible.

Samir

What kind of documentation is missing ?

Idol1111222

[Login to see the link]
Library object: Operations: Library call

Samir

Thank you the report 😉

Idol1111222

And i think this too [Login to see the link]

Samir

Thank you !
You can create issues on the LuaRT documentation GitHub repository if you found other errors 😉

Idol1111222

The last: the 'readonly' option in the variable where it says 'get/set' in the description and in the example the value is set. [Login to see the link]