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mandrake_lazy
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 Posted: Tue Jun 22, 2004 3:42 pm Post subject: pssssst bjorn |
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hey bjorn, you rock with a sock when it comes to Lua, or so I've heard....I have a question-> if I where to call a script in Lua, and I wanted to have some variables sent to it as global varaibles, would all I have to do is just push these varaibles onto the stack?
EDIT:
whoops. sorry about the name spelling.
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Bjorn
Demon Hunter
Joined: 29 May 2002
Posts: 1425
Location: Germany
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| Posted: Tue Jun 22, 2004 10:37 pm Post subject: |
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I think you can just set the globals before calling the script... There is a table holding the globals, I think it's called _G. Grab a reference to the table, then set your globals in the table. This can all be done using the C API. When you're done, call the script.
We'll see if I rock with a sock. :P
If that's too complicated, what about executing a dynamically created string like:
| Code: | lua_State *L = lua_open();
char *script = new char[32];
int varValue = 56;
snprintf(script, 32, "globalVarName = %d\n", varValue);
lua_dostring(L, script); |
Though I think it's quite ugly. :)
Last edited by Bjorn on Tue Jun 22, 2004 10:49 pm; edited 1 time in total
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biggerUniverse
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Joined: 18 Nov 2003
Posts: 326
Location: A small, b/g planet in the unfashionable arm of the galaxy
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| Posted: Tue Jun 22, 2004 10:45 pm Post subject: |
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I heard he was rocking with a stocking... but I don't know if that's the same thing...
_________________
We are on the outer reaches of someone else's universe.
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Bjorn
Demon Hunter
Joined: 29 May 2002
Posts: 1425
Location: Germany
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| Posted: Tue Jun 22, 2004 11:01 pm Post subject: |
[quote] |
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Figured it out from the manual, this should do it:
| Code: | lua_pushstring(L, "globalVarName");
lua_pushnumber(L, varValue);
lua_settable(L, LUA_GLOBALSINDEX); |
Notice also that in lua.h, there is a convenience function to set global variables:
| Code: | #define lua_setglobal(L,s) \
(lua_pushstring(L, s), lua_insert(L, -2), lua_settable(L, LUA_GLOBALSINDEX)) |
Which can be used as follows:
| Code: | lua_pushnumber(L, varValue);
lua_setglobal(L, "globalVarName"); |
lua.h and lauxlib.h contain quite a bit of convenience functions that are not in the manual, you should check them out.
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Mandrake
elementry school minded asshole
Joined: 28 May 2002
Posts: 1341
Location: GNARR!
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| Posted: Wed Jun 23, 2004 3:52 am Post subject: |
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I think I will actually. Thanks, the help is much appriciated. I'm working on doing some scripting for teh Changeling- originally I was going to do it in Python, but Python is not very easy to use to extend a program (although extending Python with C is easy, but extending C with Python is not...agh. What a mess). And Lua, from what I had used earlier, seemed to be very simple to get up and running.
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Xmark
http://pauljessup.com
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