LuaRT 2.0.0 released

Samir

Hi Community,

LuaRT 2.0.0 has just been released. You can download it here : [Login to see the link]

Binary modules support for static compilation

The main highlight is the support of binary modules for static exe compilation : you can now link Lua binary modules with your executables without the need to use lua54.dll

To do this, LuaRT uses custom dynamic linking with the LuaRT interpreter. This means that if you want to link third party Lua 5.4 binary modules with your executable, you will need to recompile the binary module using the new lua54-static.lib library instead of lua54.lib.

Such modules have "-static" appended to their names (ie webview-static.dll)

The static executables are still lightweight : An executable linked with Webview module is just 450kb on x86 and 520kb on x64

New `serial` module

A new module for serial port communication is now available.
You can connect to a COM port, send and receive data asynchronously with the famous Task object

The release comes with new community asked features and a lot of bug fixes.

Hope you will appreciate it !

Regards,

Samir

steve64

A first look to LuaRT 2.0.0 is promising.
I have been already able to build my previous apps as single exe without the Lua DLL.
I will now try the new serial port module.
However, it would be also very useful to add a uilt-in LuaRT function to query the available COM ports.
So far I was using a pipe approach that is not so easy and also it does not work anymore in LuaRT 2.0.0.
This was the code previously working with LuaRT 1.9.5:

local com_ports = {}
local pipe = sys.Pipe('cmd.exe')
await(pipe:read())
pipe:write('reg query HKEY_LOCAL_MACHINE\\HARDWARE\\DEVICEMAP\\SERIALCOMM\n')
local result = await(pipe:read())
for line in result:gmatch("([^\n]*)[\n]") do
  if line:match('Device') then
    local pos = line:find('COM')
    table.insert(com_ports, line:sub(pos))
  end
end

steve64

In the meanwhile I have found a better way using the registry, see below.
Anyway, a built-in function would be still preferable...

local com_ports = {}
for i = 0, 20 do
  local key = 'HARDWARE\\DEVICEMAP\\SERIALCOMM'
  local entry = sys.registry.read( 'HKEY_LOCAL_MACHINE', key, '\\Device\\Serial'..i)
  if entry then table.insert(com_ports, entry) end
  entry = sys.registry.read( 'HKEY_LOCAL_MACHINE', key, '\\Device\\VCP'..i)
  if entry then table.insert(com_ports, entry) end  
end

There is still an issue: on my PC I can open "COM3" but not "COM15", is it an issue with the number 15 being over 9 ?

Samir

Yes it's a limitation of the Windows API. I will see if I can bypass it, I guess...

steve64

I just found that prefixing as follows it seem to work:

port_name = 'COM15'
COM_PORT = serial.Port('\\.\'..port_name)
...

Samir

Yes that's it for Com ports over COM9