RE: Problems with creating a table from backend

[jdarling@...]

Its actually generic Pascal.  I am using Delphi to test in as it still
works a bit better then Lazarus in my openion, but I can also compile
it in Pascal.

Just to make a sanity check then (I'll leave out all specific code) it
should look something like this then:

lua_newtable(L);
tbl = lua_gettop(L);
lua_pushstring(L, 'Params');
lua_pushvalue(L, tbl);
lua_settable(L, LUA_GLOBALSINDEX);
lua_pushnumber(L, 1);
lua_pushstring(L, 'Value 1');
lua_settable(L, tbl);
lua_pushnumber(L, 2);
lua_pushstring(L, 'Value 2');
lua_settable(L, tbl);
lua_remove(L, tbl);

then in my lua:
function Test(v, k)
  print(v..' '..k.."\n")
end
table.foreach(Params, Test)

In theory my output should be: 
1 Value 1
2 Value 2

If so then this blows up in my face as well.  No warnings or errors, the
app just closes and dies.  I can read/write C/C++ as well, if you happen
to have some sample code of embedding a table in a table that would be
excelent :)

 - Jeremy

"Help I suffer from the oxymoron Corporate Security."


> -------- Original Message --------
> Subject: Re: Problems with creating a table from backend
> From: Matt Campbell <mattc@freedombox.cc>
> Date: Thu, April 13, 2006 11:08 am
> To: Lua list <lua@bazar2.conectiva.com.br>
> 
> Hello Jeremy:
> 
> The problem is that in the second procedure, you create the table, 
> retrieve its stack index, and then call lua_settable to make it a global 
> variable.  Calling lua_settable pops the newly created table from the 
> stack, making your stored stack index invalid.  Instead, that function 
> should begin as follows:
> 
>   lua_newtable(L);
>   tbl := lua_gettop(L);// get the table reference
>   lua_pushstring(L, 'Params');
>   lua_pushvalue(L, tbl); // push it again to make it a global
>   lua_settable(L, LUA_GLOBALSINDEX);//set the var name "Params" = table 
> instance
> 
> To keep your pushes and pops balanced, the function should now have this 
> at the end:
> 
>   lua_remove(L, tbl);
> 
> I hope this helps.
> 
> BTW, is this Delphi, or some other form of Pascal?  I don't really know 
> Pascal, but the relevant code was similar enough to C that I could 
> follow it.
> 
> -- 
> Matt Campbell
> Lead Programmer
> Serotek Corporation
> www.freedombox.info
> "The Accessibility Anywhere People"