default table in C functions
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- Subject: default table in C functions
- From: jseb <gmane2010@...>
- Date: 2011年1月05日 15:32:51 +0100
Hello,
For some time, i couldn't accessing datas from a table i send to a C
function.
I was accessing table members like this:
char *params[]={"rotx","roty","rotz","posx","posy","posz",
"md2_id","current_anim","current_frame",0};
int nb_params=(sizeof(params)/sizeof(char*))-1;
for (int i=0; params[i]; i++) {
lua_getfield(L,1,params[i]);
}
You can see that the extracted parameters are all pushed (they are put
into C vars after the loop. And yes, i check if there's enough room on
the stack before doing it).
The problem was that nothing was retrieved.
So i've dumped the lua stack, at the very beginning of my C function.
** STACK DUMP (top: 2) **
type [table] unknown @ 1 <- ??? unknown table
type [table] unknown @ 2 <- my table
Seeing that, i just changed the stack index in "lua_getfield" to "2".
Ok, it works.
Now, my question is : what is exactly this table ? Does it contain
interesting things, or raise it no point for an average programmer like me ?
I tried a google search with "c environment lua table" (and some minor
variations), with no luck.
Thank you.