Re: Setting the lua_pcall error string on exception (catch block)?

[Tom N Harris <telliamed@...>]

On 04/03/2012 05:58 PM, Eric Wing wrote:
> I want to use Objective-C's exception handling mechanism with Lua. It
> is very similar to C++'s exception handling mechanism (and in fact
> they are unified behind the scenes with Apple's modern runtime).
>
> I modified luaconf.h and ldo.c  (Lua 5.1) and this seems to work
> pretty well and catches both Lua and Obj-C errors which is what I
> think I want .
>
> But in the case of an exception originating from Obj-C (not Lua), I
> would like to set the Lua error message to pass the Obj-C exception
> description (string) pcall returns this error string. How do I set the
> Lua error string while inside LUAI_TRY (catch block)?
>
>
> Thanks,
> Eric

It should be enough to just push the error message as part of LUAI_TRY. 
With C++ it would be something like:

#define LUAI_TRY(L,c,a) try { a } \
    catch(std::exception e) \
        { lua_pushstring(L, e.what()); (c)->status = -1; } \
    catch(...) \
        { if ((c)->status == 0) (c)->status = -1; }

--
- tom
telliamed@whoopdedo.org