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> I registered this function with lua_register(...) and it works, but
> when I try in Lua:
> h=GetHello()
> h:SayIt()
> it throws an error, saying it attempted to access global variable 'h'

I think the problem is that you have mismatched tags. You have to something
like :-

  lua_pushusertag(L, (void *) myhello, tolua_tag(L,"Hello"));

Or, you could use toLua to create the Hello object. Just expose the
constructor Hello::Hello()

eg. toLua pkg:
class Hello {
  void SayIt();

then Lua code:

h = Hello:new() -- Hello::Hello()
h:delete() -- Hello::~Hello()