error handling questions

[Jacek Popławski <jacekpoplawski@...>]

1) When I call lua function from my C++ game, I use:

int result=lua_pcall(L,nargs,nresults,0);
if (result!=0)
        PrintError();

And it works perfectly. PrintError prints result and string taken from stack
(with lua_tostring(L,-1)).

2) When I run scripts with functions I call:

int result=lua_dofile(L, filename);

I can read result, but I can't read anything from stack. I know that file is
wrong, but I don't know why, I must check it by hand (sometimes it requires few
tries).

3) When I run command from user (game console) I call:

int result=lua_dostring(L,s);

Same problem - nothing on stack.

4) Why following script doesn't work?

function errorFallback(msg)
        s=string.format("lua error (callback): %s\n",msg);
        DevConPrint(s);
end;

setfallback('error',errorFallback);

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