A Lua type that allows arbitrary C data to be stored in Lua variables. It's used to represent new types created by an application program or a library written in C.
Questions tagged [lua-userdata]
56 questions
0
votes
1 answer
Reuse lua_newuserdata() returned pointer
¿Is posible reuse lua_newuserdata() returned pointer?
The idea is not allocate a new userdatum every time for the same object and allow equality check (example) done by lua.
obj1 = c_api__foobar();
obj2 = c_api__foobar();
if obj1 == obj2 then
…
kapodamy
- 65
- 8
0
votes
2 answers
LuaU script (Roblox), how can I make a Key get pressed with a script
An example would have been like
local E = game:GetService('UserInputService').SetKeyDown(Enum.KeyCode.E)
but it doesnt work ofcourse because i cant jsut make my game press E by itself with this thing, so it requieres soemthing longer and if you…
demxkero
- 26
- 1
- 3
0
votes
1 answer
Attempt to call a userdata value
So i'm trying to make a part disapear when the player touch it but it says : Workspace.RedCastle.Grid.Script:1: attempt to call a userdata value
Here's my code :
script.Parent.Part.Touched(function(part)
for i, part in…
Linkthehero2222
- 305
- 4
- 16
0
votes
0 answers
lua - check if userdata is nil
I trying to use lua cjson to parse to following json :
{
"data" : null,
"message" : "Your session has expired. Please login again.",
"code" : "390112",
"success" : false
}
it's parsed to the following map…
Eyal leshem
- 995
- 2
- 10
- 21
0
votes
1 answer
Converting Go Struct instance to Lua table
I have an instance of a Go Struct and will like to pass the instance to a Lua method using GopherLua.
My Go code goes like this:
dog := new(Animal)
runParam := lua.P{
Fn: L.GetGlobal("run"),
NRet: 1,
Protect: true,
}
mt :=…
Sulaiman Adeeyo
- 485
- 6
- 19
0
votes
3 answers
How to extend SWIG's userdata in Lua code?
I am using SWIG to bind C++ code to Lua. So far it looks good, but now I need to "cheat" and extend a single userdata from within Lua, adding custom fields and methods, etc.
I can't find a way to accomplish it while working within SWIG's directives.…
Kaa
- 677
- 6
- 17
0
votes
1 answer
Hand over global custom data to Lua-implemented functions
Within my Lua-application I have some own functions defined that are registered with lua_register("lua_fct_name","my_fct_name") so that they are known to the Lua script.
Now I have some custom/user data that need to be accessible within…
Elmi
- 5,899
- 15
- 72
- 143
0
votes
3 answers
does Lua allow metamethods with weird number of arguments?
For example, can I declare a metamethod for __index which takes two arguments, then do something like myuserdata[somearg1, somearg2]? Not that I want to use it or that I have any idea of why it would be useful, I'm just wondering if in my library…
Lorenzo Pistone
- 5,028
- 3
- 34
- 65
-1
votes
1 answer
create lightuserdata in lua for luaglut glReadPixels
I'm using luaglut and when I try to use the glReadPixels to capture a frame, I cannot prepare the last input argument for it successfully.
This is how I call the function:
glReadPixels(0, 0, 250, 250, GL_RGB, GL_UNSIGNED_BYTE, img)
The img is…
user1514071
- 21
- 3
-2
votes
1 answer
Using C++ objects in Lua scripts
How I can use C++ objects in lua script?
example class:
class cMyClass
{
int a;
void myTest(int b){};
}
cMyClass MyObject;
example using in lua(is what i need):
MyObjectLuaName.myTest(7);
MyObjectLuaName.a=12;
Thanks!
Nataly
- 15
- 2
-4
votes
1 answer
Lua memory leak when add lua table in userdata object
When I pressed the 'btn' memory rose up from 80M to 240M.
And I pressed the 'btn2' to remove the object(self.sprite) include many lua table, but the memory didn't go down.
What wrong with this code? Or it is a lua bug?
I used…
superyyl
- 3
- 3