luaScript object is a way to call LUA script from inside QML script. Backward call (from lua to qml) is not possible. So QML should use functions’ calls to get fresh data from script always.

Object has next methods (functions):

• luaScript.callI – returns Integer;
• luasScript.callS – returns String;
• luaScript.callV – returns nothing (Void);
• luaScript.callSL – returns Strings List;

All those methods accept LUA’s function name as 1st parameter. 2nd parameter is optional and can be: integer, string, integer list (array), string list(array).

Sample:

Button {
        id: brun
        x: 6
        y: 454
        anchors.left: parent.left
        anchors.leftMargin: 6
        anchors.top: textBG.bottom
        anchors.topMargin: 172
        onClicked: luaScript.callV("run_clicked",edit.text)
        skin: "./run.png"
    }

This sample declares some button when it’s clicked it calls lua function “run_clicked” and passes text from “text edit box” to it. Lua file should have next:

function run_clicked(what)
  local f,err = loadstring(what)
  if f == nil then
     showMsg(string.format("Error: %s",err))
  else
     local s,m = pcall(f)
     if not s then
       showMsg(string.format("Error: %s",m))
     end
  end
end

This version is not final but is minimal to solve tasks like programming I/O COM port terminal completelly using scripts.