No. Maybe there is an API error when iuplua_checkihandle is NULL. The
implementation is this:
Ihandle *iuplua_checkihandle(lua_State *L, int pos)
{
lua_getmetatable(L, pos); /* t2 = metatable(stack(pos)) */
lua_pushstring(L, "iup handle");
lua_gettable(L, LUA_REGISTRYINDEX); /* t = registry["iup handle"] */
if (lua_rawequal(L, -2, -1)) /* check (t2==t)? */
{
lua_pop (L, 2);
return *(Ihandle**)lua_touserdata(L, pos);
}
else
{
luaL_argerror(L, pos, "iup handle expected");
return NULL;
}
}
Compile Lua with debug information, and check in which Lua function call the
error occurs.
Best,
Scuri
From: Benoit Germain [mailto:[email protected]]
Sent: quarta-feira, 19 de fevereiro de 2014 12:42
To: IUP discussion list.
Subject: Re: [Iup-users] [IUP 3.10.1, Windows 7 64] iup.Refresh() causes a
Lua APICHECK assertion
I checked the behavior again: I have a Lua51 runtime without APICHECK (the
one from LuaBinaries), where doing iup.Refresh() indeed shows a popup about
the missing parameter. With my Lua52 runtime where APICHECK is enabled, the
program aborts because of an API error. So maybe this is specific to the
iup*52 DLLs?
2014-02-18 22:40 GMT+01:00 Benoit Germain <[email protected]>:
Ah ok my bad. I'll check again, but AFAIR, I didn't get a Lua error with a
runtime built without APICHECK. In that case, this means that malicious code
intentionally forgetting the ihandle parameter corrupts the C stack by
potentially overflowing the Lua stack.
2014-02-18 19:21 GMT+01:00 Antonio Scuri <[email protected]>:
Hi Benoit,
The iup.Refresh implementation in Lua is actually quite simple:
static int Refresh (lua_State *L)
{
IupRefresh(iuplua_checkihandle(L,1));
return 0;
}
If iuplua_checkihandle is not triggering the same problem in other
functions, I don't know where the problem is.
But notice that you Lua code is actually ignoring the Ihandle parameter:
iup.Refresh()
Then in a regular Lua run will trigger a Lua error.
Your call should be
iup.Refresh(self)
for instance.
Best,
Scuri
From: Benoit Germain [mailto:[email protected]]
Sent: quinta-feira, 30 de janeiro de 2014 11:52
To: IUP discussion list
Subject: [Iup-users] [IUP 3.10.1, Windows 7 64] iup.Refresh() causes a Lua
APICHECK assertion
Hello,
With the attached script run with a Lua runtime I built with APICHECK
enabled, I get an assertion coming from iuplua52.dll when calling
iup.Refresh(). There must be a missing lua_checkstack() somewhere :-).
Regards,
--
Benoit.
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