Reporting error messages

["Robert Osfield" <robert.osfield@...>]

Hi,

I rather new to Lua, and have slowly progressed to the point of
successfully integrating C++ and Lua via Swig, and have a 3D app
running with an init and frame being all controlled from Lua
scripts.  Still rather simple scripts and simple C++ classes but
progress no less.  

The bit I'm currently perplexed by is how to report back errors that
occur in the Lua scripts - when errors, in my C++ code I have:

   int result = luaL_dofile(L, "frame.lua"); 

And when the script runs fine I get a 0, and when there is an error I
get 1, which is all go so far, but... where do I go next to report the
details of the error, such as the line number, and the error
message?  I have searched the lua websites and headers and can't
find anything to point me in the right direction.

Thanks in advance for you help,
Robert.