21 posts
C:\Windows\System32\
2427 posts
UK
21 posts
C:\Windows\System32\
21 posts
C:\Windows\System32\
function foo ()
shell.run("file")
end
if pcall(foo) then
print("no error")
else
print("yes error")
end
2427 posts
UK
21 posts
C:\Windows\System32\
function makeError(n)
return 'N'+n;
end
if pcall(makeError,n) then
print("no error!")
else
print("That method is broken, fix it!")
end
2427 posts
UK
--# in this example I want to pass the variable 'a' as an argument to a function which I am pcall-ing
--# I'm using the function 'print' as the function I want to call but this works the same for any function
--# what we are passing is not important for this example
local a = "abcd"
--# define a wrapper function which passes the argument for us
local function f()
print(a)
end
--# pass pcall the wrapper function
pcall(f)
--# alternatively you could use an anonymous function
--# think this as a temperary wrapper function which is discarded after use
pcall(function() print(a) end)
--# if you run this code you should find that it prints 'abcd' twice on two seperate lines
21 posts
C:\Windows\System32\
3057 posts
United States of America
local filename = "foo"
local file = fs.open( filename )
local data = file.readAll()
file.close()
pcall( loadstring( data, filename ) )
21 posts
C:\Windows\System32\
3057 posts
United States of America
21 posts
C:\Windows\System32\
467 posts
Van Diemen's Land
local error = function() return nil end
local printError = function() return nil end
3057 posts
United States of America
Was gonna say, if you want to completely disable errors you could just do..That would disable errors for that program, but would fix itself outside of it.local error = function() return nil end local printError = function() return nil end
8543 posts
2427 posts
UK
467 posts
Van Diemen's Land
I wonder what lead me to belive otherwise, did CC not have this for a while?
3057 posts
United States of America
Well it makes sense. If you want to 'pcall' creating a new box or something with specific diameters and catch an error if something was put in wrong then you would need those extra arguments..
pcall( function() createNewBox( a, b, c, d ) end )
7083 posts
Tasmania (AU)
I wonder what lead me to belive otherwise, did CC not have this for a while?
467 posts
Van Diemen's Land
Well it makes sense. If you want to 'pcall' creating a new box or something with specific diameters and catch an error if something was put in wrong then you would need those extra arguments..
Not necessarily. You could always wrap it in an anonymous function. Obviously it's more convenient to pass the arguments to pcall though.pcall( function() createNewBox( a, b, c, d ) end )