lua以xpcall實現try catch功能

--

列印錯誤資訊
local
function
__trackback__(errmsg)
local track_text = debug.traceback(tostring(errmsg), 6
);    
print("
---------------------------------------- trackback ----------------------------------------");
print(track_text, "
lua error");
print("
---------------------------------------- trackback ----------------------------------------");
local exception_text = "
lua exception\n
".. track_text;
return
false
;end
--[[
嘗試調乙個function 這個function可以帶可變引數
如果被呼叫的函式有異常 返回false，退出此方法繼續執行其他**並列印出異常資訊；
]]function
trycall(func, ...)
local args =;
return
xpcall(function() func(unpack(args)) end
, __trackback__);
end--
測試**：
trycall(
function
(param)
print("
message 
"..param)
print("
message 
"..nil
)        
end, "
test trycall
")

##輸出結果如下：

>lua -e "io.stdout:setvbuf 'no'" "itertor_test.lua"

message test trycall

---------------------------------------- trackback ----------------------------------------

itertor_test.lua:45: attempt to concatenate a nil value

stack traceback:

itertor_test.lua:43: in main chunk

[c]: ? lua error

---------------------------------------- trackback ----------------------------------------

>exit code: 0

this function is similar topcall,except that you can set a new error handler.

xpcallcalls functionfin protected mode,usingerras the error handler.any error insidefis not propagated;instead,xpcallcatches the error,calls theerrfunction with the original error object,and returns a status code.its first result is the status code (a boolean),which is true if the call succeeds without errors.in this case,xpcallalso returns all results from the call,after this first result.in case of any error,xpcallreturnsfalseplus the result fromerr.

lua以xpcall實現try catch功能

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