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Lynxz Gaming
Expert Cheater
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Joined: 01 Jul 2017
Posts: 208
Location: help
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 Posted: Sat Jul 21, 2018 5:15 am Post subject: how to try catch exception [help] |
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Hello,
How to try catch exception
like we do in vb or c# but in lua
ty
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my english is bad
discord : rynx#9828 |
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FreeER
Grandmaster Cheater Supreme
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Joined: 09 Aug 2013
Posts: 1091
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| Posted: Sat Jul 21, 2018 5:35 am Post subject: |
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pcall or xpcall, however iirc many functions provided by CE don't seem to support it (you'll get an error through the lua engine rather than a lua error placed on the stack that you can catch)... I practically never use it, preferring to instead write code that simply won't cause an error 
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atom0s
Moderator
 Reputation: 205
Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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| Posted: Sat Jul 21, 2018 11:49 am Post subject: |
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My modded version of someone elses implementation:
| Code: |
----------------------------------------------------------------------------------------------------
-- func: try (try, catch, finally)
-- desc: Implements C++ style try/catch handlers, and introduces C# style finally.
-- cred: djfdyuruiry
-- link: https://github.com/djfdyuruiry/lua-try-catch-finally/blob/master/try-catch-finally.lua
----------------------------------------------------------------------------------------------------
function try(trycb)
local status, err = true, nil;
-- Handle the try block if it is a proper function..
if (type(trycb) == 'function') then
status, err = xpcall(trycb, debug.traceback);
end
------------------------------------------------------------------------------------------------
-- func: finally
-- desc: Implements the 'finally' callback handling for the try/catch/finally setup.
------------------------------------------------------------------------------------------------
local finally = function(finallycb, hascatchcb)
-- Invoke the finally callback if present..
if (type(finallycb) == 'function') then
finallycb();
end
-- Throw error if no catch callback is defined..
if (not hascatchcb and not status) then
error(err);
end
end
------------------------------------------------------------------------------------------------
-- func: catch
-- desc: Implements the 'catch' callback handling for the try/catch/finally setup.
------------------------------------------------------------------------------------------------
local catch = function(catchcb)
local hascatchcb = type(catchcb) == 'function';
-- Invoke the catch callback if valid and an error was caught..
if (not status and hascatchcb) then
local e = err or '(Unknown Error)';
catchcb(e);
end
-- Return a table exposing the finally handler..
return {
finally = function(finallycb)
finally(finallycb, hascatchcb);
end
};
end
-- Return a table exposing the catch and finally handlers..
return {
catch = catch,
finally = function(finallycb)
finally(finallycb, false);
end
};
end |
Example usage from one of my hooks:
| Code: |
------------------------------------------------------------------------------------------------
-- event: beginscene
-- desc : Invoked when a Direct3D scene is beginning.
-- ret : (No returns.)
------------------------------------------------------------------------------------------------
['beginscene'] = {
name = 'beginscene',
default = nil,
handler = function(self, callbacks, ...)
-- Loop and invoke each callback..
for k, v in ipairs(callbacks) do
try(function()
v.c();
end).catch(function(e)
print(string.format('Event callback error was caught. (%s:%s) Error: %s', self.name, k, e));
end);
end
end
},
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Lynxz Gaming
Expert Cheater
![]() Reputation: 4
Joined: 01 Jul 2017
Posts: 208
Location: help
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| Posted: Sat Jul 21, 2018 9:05 pm Post subject: |
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| atom0s wrote: | My modded version of someone elses implementation:
| Code: |
----------------------------------------------------------------------------------------------------
-- func: try (try, catch, finally)
-- desc: Implements C++ style try/catch handlers, and introduces C# style finally.
-- cred: djfdyuruiry
-- link: https://github.com/djfdyuruiry/lua-try-catch-finally/blob/master/try-catch-finally.lua
----------------------------------------------------------------------------------------------------
function try(trycb)
local status, err = true, nil;
-- Handle the try block if it is a proper function..
if (type(trycb) == 'function') then
status, err = xpcall(trycb, debug.traceback);
end
------------------------------------------------------------------------------------------------
-- func: finally
-- desc: Implements the 'finally' callback handling for the try/catch/finally setup.
------------------------------------------------------------------------------------------------
local finally = function(finallycb, hascatchcb)
-- Invoke the finally callback if present..
if (type(finallycb) == 'function') then
finallycb();
end
-- Throw error if no catch callback is defined..
if (not hascatchcb and not status) then
error(err);
end
end
------------------------------------------------------------------------------------------------
-- func: catch
-- desc: Implements the 'catch' callback handling for the try/catch/finally setup.
------------------------------------------------------------------------------------------------
local catch = function(catchcb)
local hascatchcb = type(catchcb) == 'function';
-- Invoke the catch callback if valid and an error was caught..
if (not status and hascatchcb) then
local e = err or '(Unknown Error)';
catchcb(e);
end
-- Return a table exposing the finally handler..
return {
finally = function(finallycb)
finally(finallycb, hascatchcb);
end
};
end
-- Return a table exposing the catch and finally handlers..
return {
catch = catch,
finally = function(finallycb)
finally(finallycb, false);
end
};
end |
Example usage from one of my hooks:
| Code: |
------------------------------------------------------------------------------------------------
-- event: beginscene
-- desc : Invoked when a Direct3D scene is beginning.
-- ret : (No returns.)
------------------------------------------------------------------------------------------------
['beginscene'] = {
name = 'beginscene',
default = nil,
handler = function(self, callbacks, ...)
-- Loop and invoke each callback..
for k, v in ipairs(callbacks) do
try(function()
v.c();
end).catch(function(e)
print(string.format('Event callback error was caught. (%s:%s) Error: %s', self.name, k, e));
end);
end
end
},
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ooo thank you at0m
_________________
my english is bad
discord : rynx#9828 |
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