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onnoj
Newbie
Joined: 24 Jun 2011
Posts: 4
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 Posted: Mon Jul 25, 2011 10:23 am
LUA Errors and triggers
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Hi,
For some reason errors thrown by LUA are not reported when the script was executed from a trigger.
I understand that it's not a good idea to pop up the error dialog (that would be annoying), but the errors aren't written to the script debugger either.
I'm hoping that I've just missed an Output-LUA-Errors-To-Log option somewhere, but, in case I haven't, there's a workaround. Put the following LUA code in an OnLoad event:
| Code: |
Debug = {};
Debug.DEBUGLastCall = "<unknown>";
function Debug:SetDEBUGLastCall(str)
self.DEBUGLastCall = str;
end
function Debug:SafeCall(object, func, ...)
self.DEBUGLastCall = "<unknown>";
local status,ret;
if(object ~= nil) then
status, ret = pcall(func, object, ...);
else
status, ret = pcall(func, ...);
end
if(status ~= true) then
print("Error occurred: (" .. self.DEBUGLastCall .. "):" .. ret);
self.DEBUGLastCall = "<unknown>";
return nil;
else
return ret;
end
end |
From then on you can use SafeCall to wrap a (table) function in an error handler. SafeCall is an table function, so you'll need to call it as follows:
| Code: |
Debug:SafeCall(table, func, arguments) where 'table' is optional (pass nil if you're calling a regular function), 'func' the function you want to call, and any number of arguments.
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So, if you have:
| Code: |
--Table/Class function:
class = {};
function class:doDance(value)
print(value);
dance(value)! --error
end
--Naked function:
function boggle()
goggle++; --error
end |
Then call doDance using:
| Code: |
Debug:SafeCall(class, class.DoDance, 123);
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or for 'naked' functions, use:
| Code: |
Debug:SafeCall(nil, boggle) |
Of course, once you DO trigger an error, you'll want additional debugging info on where it occurred. Just use Debug:SetDEBUGLastCall("my function name"); in every function you may want to debug. |
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Zugg
MASTER
Joined: 25 Sep 2000
Posts: 23379
Location: Colorado, USA
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Posted: Tue Aug 02, 2011 9:01 pm
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It is *very* difficult for CMUD to display errors that occur in the Lua thread. Lua executes in a different thread and only the main UI thread is allowed to display popup messages.
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