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- Subject: RE: How do I check for errors returned from a C function?
- From: "Dolan, Ryanne Thomas (UMR-Student)" <rtdmr6@...>
- Date: Fri, 30 Dec 2005 10:06:12 -0600
two ways i can think of:
Just return a boolean from your C function, and have your Lua script check this value against true:
if not Entity:SendText ("Hello!") then
print ("SendText failed!");
Or, use lua_error in your C function and call SendText in a protected environment:
local success, error_msg = pcall (Entity:SendText, "Hello!");
if not success then
print ("SendText failed: ", error_msg);
From: email@example.com on behalf of John Klimek
Sent: Fri 12/30/2005 9:05 AM
To: Lua list
Subject: How do I check for errors returned from a C function?
For my game I plan to have lots of objects running scripts (players,
npcs, rooms, items, etc). Whenever an object runs a script I create a
global lua userdata called "Entity". The lua script can then check
for the actual entity type by using Entity:GetType.
Now suppose that only player entities can use the SendText C function.
The following code would be invalid:
if (Entity:GetType() == 'item') then
Entity:SendText("Hello!"); // invalid, item Entity's cannot use SendText
So what I'd like to do is for the C function SendText is throw back an
error. I'm aware that I can push the error message to the stack and
then use lua_error but how do I check for the error inside of my lua
Also, does my above script engine logic seem OK?