🔒 Locked

Defining global / local variable in lua

Started by iliak Feb 28, 2007 at 3:25 AM 3 replies 2.8k views

Original Post

Feb 28, 2007 at 3:25 AM

Hello Can someone point me to an url / source / ... where I can define a variable in lua from c++ ? Here's what I want in pseudo code : From C++: std::string variable = "arg1"; int value = 10; SetLuaVariable(variable.c_str(), value); CallLUAFunction("func"); From Lua: function func() print ("arg1 = "..arg1) end Lua doc is not realy clear. Thx

Kylotan

Feb 28, 2007 at 7:47 AM

Find 'lua_setglobal' on that page and give that a go.

iliak

Feb 28, 2007 at 8:47 AM

Thanks Kylotan

Here's what I do now :

cLevel *level = new cLevel();...lua_pushinteger(Lua, elapsed);lua_setglobal(Lua, "elapsed");lua_pushlightuserdata(Lua, Level);lua_setglobal(Lua, "level");SendEvent("UPDATE");

Everything works well excepted that "level" in lua fire this error :

attempt to index global 'level' (a userdata value)

How can I set it correctly in lua ?

Kylotan

Feb 28, 2007 at 10:12 AM

Lua doesn't know what to do with userdata. After all, it could represent absolutely anything. You have to write functions to handle userdata in the way that you need.

iliak

Mar 2, 2007 at 4:01 AM

For the curious ones, here's how a solved my problems :

Passing variables from C++ to lua with luabind :

	template<class T>	void SetScriptGlobal(const char *name, T value)	{		globals(Lua)[name] = value;	}

Topic Locked

This topic has been locked by a moderator. New replies are not allowed.