Load DLL with LUA Loadlib command

[MaxAigner]

hi everyone,

 

I have just tried to implement an DLL into lua with the loadlib command.

http://www.lua.org/pil/8.2.html#C-packages

they say it should work but it does not

 

Main.lua

path = "c:\\windows\\system32\\user32.dll"
   local GetSystemMetrics = assert(loadlib(path, "GetSystemMetrics"))

 

Error:

"Script Error:

Attempt to call global 'loadlib' (a nil value)

 

Is there a way of enabling this?

 

It would increase the possibilities of Leadwerks and Lua a Lot and it would allow us to make better leadwerks projects so that leadwerks can get more famous and bought more often!!

[Olby]

Have you turned off sandboxing mode?

[Rick]

Tools->Options->uncheck Sandbox Lua. Note this means your game won't work in the LE Game Launcher app then.

[MaxAigner]

I already did this .. The two lines of code really work for you?

Maybe you can test one for me a bit

for me it shows the errormessage...

[Einlander]

You simply can not use a regular dll for lua. It must be built for lua http://lua-users.org/wiki/CreatingBinaryExtensionModules and http://lua-users.org/wiki/CreatingBinaryExtensionModules . If you really want to use a dll, there are probably ways to do it, but all of them are non trivial. I recommend luajit because leadwerks supports that. http://luajit.org/ext_ffi_tutorial.html

 

Quick and dirty:

 

local ffi = require( 'ffi' )

ffi.cdef [[

int GetSystemMetrics(int test);

]]

local user32 = ffi.load(ffi.os == "Windows" and "user32" )

error("Screen Dimensions " .. tostring(user32.GetSystemMetrics(0)) .. "x" .. tostring(user32.GetSystemMetrics(1)))

 

You will be searching through header files.

[MaxAigner]

ok I will try it out - Thank you Einlander!