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lua以xpcall实现try/catch功能
-- 打印错误信息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--[[ 尝试调一个function 这个function可以带可变参数如果被调用的函数有异常 返回false,退出此方法继续执行其他代码并打印出异常信息;]]function trycall(func, ...) local args = { ... }; return xpcall(function() func(unpack(args)) end, __TRACKBACK__);end
--测试代码:
trycall(function(param)
print("message "..param)
print("message "..nil)
end, "test trycall")
##输出结果如下:
>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
xpcall (f, err)
This function is similar to pcall
,except that you can set a new error handler.
xpcall
calls function f
in protected mode,using err
as the error handler.Any error inside f
is not propagated;instead, xpcall
catches the error,calls the err
function 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, xpcall
also returns all results from the call,after this first result.In case of any error,xpcall
returns false plus the result from err
.
lua以xpcall实现try/catch功能