Thanks for a quick reply =)
I noticed I wasn't pushing the nil,
my code now looks exactly like yours, but it's still error-ing;
correct me if I'm wrong but,
when you go to recurse, you pass in an index of -1 for lua_next to
use, which is the top of the stack, yet in the function you then push
a nil, which is then at the top of the stack, thus using -1 to
reference the table would be wrong?
-Raymond
On 1/19/07, Jérôme VUARAND <jerome.vuarand@gmail.com> wrote:
> 2007年1月19日, Raymond Jacobs <raymondj@gmail.com>:
> > int idx=LUA_GLOBALSINDEX;
> > lua_getfenv(l,idx);
> >
> > while(lua_next(l,idx)!=0)
> > {
> > const char* key=lua_tostring(l,-2);
> >
> > //get value at -1 index and check type of it
> >
> > //do somthing with key and value based on type of
value
> > //if value is a table call this function again to
traverse it, then
> > continue here
> >
> >
> > lua_pop(l,1);
> > }
> >
> > it seems in theory it should be as simple as doing another
lua_next,
> > however I've not been able to get it to work, and I end up
crashing,
> > likely due to corupting the stack; either my logic or how I'm
going
> > about it is wrong, an example of how to do this in the C API
would be
> > really helpful.
>
> You forget to push an initial nil on the stack before entering you
> while loop (see lua_next documentation example). Here is what your
> code could look like :
>
> int dosomestuff(lua_State* L, int index)
> {
> // Do something with value at index (which is not a table)
> return 1;
> }
>
> int parsetable(lua_State* L, int index)
> {
> // Push an initial nil to init lua_next
> lua_pushnil(L);
> // Parse the table at index
> while (lua_next(index)!=0)
> {
> if (lua_istable(L, -1)
> {
> parsetable(L, -1);
> }
> else
> {
> dosomestuff(L, -1);
> }
> // Pop value, keep key
> lua_pop(L, 1);
> }
> return 1;
> }
>
> int parseglobals(lua_State* L)
> {
> parsetable(L, LUA_GLOBALSINDEX);
> return 0;
> }
>