• 设为首页
  • 点击收藏
  • 手机版
    手机扫一扫访问
    迪恩网络手机版
  • 关注官方公众号
    微信扫一扫关注
    公众号
登陆 注册

打印lua中不同类型的数据

原作者: [db:作者] 来自: [db:来源] 收藏 邀请
类型 打印 输出
nil
print(nil)
 nil
布尔
print(true)
 true
number
print(5)
 5
number
print(3.14)
 3.14
字符串
print("Hello World!")
 Hello World!
light c function
print(print)

function: 00007FF66598EAC0

注1：该值为value_.f的16进制

注2：print映射对应c++中的luaB_print函数
c fuction

c++代码：

static int CClosureStrLen(lua_State* L)
{
    const char* upval = lua_tostring(L, lua_upvalueindex(1)); // get first upvalue

    lua_pushnumber(L, (int)strlen(upval)); /* push result */
    return 1;
}

lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS); // 获取G表并压栈
lua_pushstring(L, "cclosure upvalue"); // 创建一个字符串upvalue，内容为cclosure upvalue，并压栈

// 创建有1个upvalue的c函数闭包（upvalue为栈顶元素），成功后将栈顶1个upvalue出栈，并将自己入栈
lua_pushcclosure(L, CClosureStrLen, 1);

// 设置索引为-2处的G表的key为Lua_CClosureStrLen对应的value为c闭包CClosureStrLen(在栈顶处) 设置成功后，将栈顶的c闭包出栈
lua_setfield(L, -2, "Lua_CClosureStrLen");

 

lua代码：

print(Lua_CClosureStrLen)

function: 000002348D50EA70

注：该值为value_.gc的16进制
lua fuction
function Func1()
end
 
print(Func1)

function: 000001C75623DBE0

注：该值为value_.gc的16进制

table

lua实现
print({1,2,a=10,b=20})

table: 000001C75623B5A0

注：该值为value_.gc的16进制

table

有元表及__tostring元方法
local mt = {}
mt.__tostring = function (t)
    return "Hello " .. t.tag
end

local t = setmetatable({x=10,tag="this is t1 table."}, mt)
print(t) --输出Hello this is t1 table. 

Hello this is t1 table.

注：t的元表实现了__tostring元方法，打印t时会调用该方法的返回值来输出

table

c++实现
print(io)

table: 000001C75622B550

注：该值为value_.gc的16进制
light userdata

c++代码：

lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);// 获取G表并压栈
lua_pushlightuserdata(L, L);// 将lua_State* L作为light userdata压栈
// 设置索引为-2处的G表的key为Lua_lightuserdata对应的value为light userdata(在栈顶处) 设置成功后，将栈顶的light userdata出栈
lua_setfield(L, -2, "Lua_lightuserdata");

 

lua代码：

print(Lua_lightuserdata)

userdata: 000001B033F52B18

注：该值为value_.p的16进制

full userdata

有元表及__tostring元方法
print(io.stdin)

file (00007FF96340FC00)

注1：由于为io.stdin实现了元方法__tostring，映射对应liolib.c的f_tostring函数

       在lua中打印io.stdin，最后会调用f_tostring函数来打印

注2：该值为((luaL_Stream*)((char*)(value_.gc) + sizeof(Udata)))->f的FILE*指针

注3：sizeof(Udata)为40
full userdata
c++代码：

lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);// 获取G表并压栈
lua_newuserdata(L, 100);//创建一个内存块大小为100的full userdata，并压栈
// 设置索引为-2处的G表的key为Lua_fulluserdata对应的value为full userdata(在栈顶处) 设置成功后，将栈顶的full userdata出栈
lua_setfield(L, -2, "Lua_fulluserdata");

 

lua代码：

print(Lua_fulluserdata)   -- 注：该full userdata无元表和元方法

userdata: 000001D5CAA03EE8

注1：该值为(char*)(value_.gc) + sizeof(Udata)的16进制

注2：sizeof(Udata)为40
lua state
print(coroutine.create(function()  end))

thread: 000001C7562428C8

注：该值为value_.gc的16进制

 

去掉元表对__tostring元方法的重写，使用lua api中的tostring进行原始输出

function tostringraw( t )
    if not t then
        return ""
    end

    local mt = getmetatable(t)
    if not mt then
        return tostring(t)
    end

    local fts = rawget(mt, "__tostring")
    if not fts then
        return tostring(t)    
    end

    rawset(mt, "__tostring", nil)
    local output = tostring(t)
    rawset(mt, "__tostring", fts)

    return output
end

 

使用lua输出

使用原生的print打印G表中的内容

for i,v in pairs(_G) do
    print("["..i.."] => "..tostring(v))
end

输出结果如下：

[rawlen] => function: 00007FF9A6038CB0  // luaB_rawlen
[utf8] => table: 000001C73CD1FD90
[next] => function: 00007FF9A60391B0  // luaB_next
[require] => function: 000001C73CD1F8D0
[select] => function: 00007FF9A603A100  // luaB_select
[debug] => table: 000001C73CD1FA10
[tonumber] => function: 00007FF9A6038690  // luaB_tonumber
[pcall] => function: 00007FF9A603A2B0  // luaB_pcall
[_VERSION] => Lua 5.3
[dofile] => function: 00007FF9A6039E70  // luaB_dofile
[table] => table: 000001C73CD1FB90
[collectgarbage] => function: 00007FF9A6038EE0  // luaB_collectgarbage
[coroutine] => table: 000001C73CD1FC10
[rawequal] => function: 00007FF9A6038C00  // luaB_rawequal
[string] => table: 000001C73CD1FCD0
[ipairs] => function: 00007FF9A60394A0  // luaB_ipairs
[error] => function: 00007FF9A60389D0  // luaB_error
[type] => function: 00007FF9A6039110  // luaB_type
[getmetatable] => function: 00007FF9A6038A40  // luaB_getmetatable
[tostring] => function: 00007FF9A603A5E0  // luaB_tostring
[_G] => table: 000001C73CD1F750
[arg] => table: 000001C73CD1FE10
[setmetatable] => function: 00007FF9A6038B00  // luaB_getmetatable
[math] => table: 000001C73CD1FD50
[load] => function: 00007FF9A6039AA0  // luaB_load
[rawget] => function: 00007FF9A6038D60  // luaB_rawget
[os] => table: 000001C73CD1FA90
[io] => table: 000001C73CD1FBD0
[print] => function: 000001C73CE093A0  // luaB_print
[pairs] => function: 00007FF9A6039290  // luaB_pairs
[assert] => function: 00007FF9A603A060  // luaB_assert
[package] => table: 000001C73CD1F910
[xpcall] => function: 00007FF9A603A410  // luaB_xpcall
[rawset] => function: 00007FF9A6038E20  // luaB_rawset
[loadfile] => function: 00007FF9A6039700  // luaB_loadfile

 

使用实现的printx来递归打印G表中的内容（带元表输出）

test3.lua代码如下：

local test3 = {}

test3.var1 = 100
function test3:func1()
end

return test3

main.lua代码如下：

function printx ( t )  
    local printx_cache={} -- 防止打印过的table被重复展开打印，造成死循环
    local function sub_printx(t,indent) -- indent为分隔字符串  当前为2个空格
        if (printx_cache[tostring(t)]) then
            print(indent.."*** has print ***")
        else
            printx_cache[tostring(t)]=true
            if (type(t)=="table") then
                local mt = getmetatable(t)
                if (mt~=nil) then -- 打印当前表的元表
                    print(indent.."table's meta"..tostring(mt).." {")
                    sub_printx(mt,indent..string.rep(" ",2))
                    print(indent.."}")
                end
                for pos,val in pairs(t) do
                    local spos = tostring(pos)
                    if (type(val)=="table" or type(val)=="userdata") then
                        print(indent.."["..spos.."] => "..tostring(val).." {")
                        sub_printx(val,indent..string.rep(" ",string.len(spos)+8))
                        print(indent..string.rep(" ",string.len(spos)+6).."}")
                    elseif (type(val)=="string") then
                        print(indent.."["..spos..'] => "'..val..'"')
                    else
                        print(indent.."["..spos.."] => "..tostring(val))
                    end
                end
            elseif type(t)=="userdata" then
                local mt = getmetatable(t)
                if (mt~=nil) then -- 打印当前userdata的元表
                    print(indent.."userdata's meta"..tostring(mt).." {")
                    sub_printx(mt,indent..string.rep(" ",2))
                    print(indent.."}")
                end
            else
                print(indent..tostring(t))
            end
        end
    end
    if (type(t)=="table" or type(t)=="userdata") then
        print(tostring(t).." {")
        sub_printx(t,"  ")
        print("}")
    else
        sub_printx(t,"  ")
    end
end

gt = {120,key1="Hello"}
require("test3")
printx(_G)  -- 打印G表中的内容

 

输出结果如下：

table: 00000226C79D02D0 {
  [utf8] => table: 00000226C79CFE50 {
              [codepoint] => function: 00007FF9A6066A60  // codepoint
              [codes] => function: 00007FF9A6067370  // iter_codes
              [len] => function: 00007FF9A6066770  // utflen
              [charpattern] => "[-�-�][�-�]*"
              [char] => function: 00007FF9A6066D60  // utfchar
              [offset] => function: 00007FF9A6066ED0  // byteoffset
            }
  [_VERSION] => "Lua 5.3"
  [package] => table: 00000226C79D0410 {
                 [cpath] => "I:\pubcode\LuaTest\LuaCode/?.dll"
                 [loaded] => table: 00000226C79D03D0 {
                               [utf8] => table: 00000226C79CFE50 {
                                           *** has print ***
                                         }
                               [package] => table: 00000226C79D0410 {
                                              *** has print ***
                                            }
                               [table] => table: 00000226C79D0210 {
                                            [remove] => function: 00007FF9A6063C80  // tremove
                                            [move] => function: 00007FF9A6063E20  // tmove
                                            [concat] => function: 00007FF9A6064110  // tconcat
                                            [pack] => function: 00007FF9A6064560  // pack
                                            [unpack] => function: 00007FF9A60646A0  // unpack
                                            [sort] => function: 00007FF9A6064D50  // sort
                                            [insert] => function: 00007FF9A6063AE0  // tinsert
                                          }
                               [io] => table: 00000226C79D01D0 {
                                         [close] => function: 00007FF9A6046660  // io_close
                                         [stderr] => file (00007FF9B1A3A510) {
                                                      userdata's metatable: 0000026A4EADF7D0 {
                                                        [__name] => "FILE*"
                                                        [lines] => function: 00007FF992497050
                                                        [seek] => function: 00007FF992498C00
                                                        [flush] => function: 00007FF992499160
                                                        [write] => function: 0000026A50891090
                                                        [read] => function: 00007FF992497E40
                                                        [__tostring] => function: 00007FF992496320
                                                        [__index] => table: 0000026A4EADF7D0 {
                                                                       *** has print ***
                                                                     }
                                                        [__gc] => function: 00007FF992496720
                                                        [close] => function: 00007FF9924965D0
                                                        [setvbuf] => function: 00007FF992498EB0
                                                      }
                                                    }
                                         [stdout] => file (00007FF9B1A3A4B8) {
                                                      userdata's metatable: 0000026A4EADF7D0 {
                                                        *** has print ***
                                                      }
                                                    }
                                         [stdin] => file (00007FF9B1A3A460) {
                                                      userdata's metatable: 0000026A4EADF7D0 {
                                                        *** has print ***
                                                      }
                                                    }
                                         [output] => function: 00007FF9A6046F00  // io_output
                                         [popen] => function: 00007FF9A6046B00  // io_popen
                                         [type] => function: 00007FF9A6046110  // io_type
                                         [read] => function: 00007FF9A6047DC0  // io_read
                                         [input] => function: 00007FF9A6046EE0  // io_input
                                         [lines] => function: 00007FF9A60470B0  // io_lines
                                         [open] => function: 00007FF9A6046870  // io_open
                                         [tmpfile] => function: 00007FF9A6046CF0  // io_tmpfile
                                         [write] => function: 00000226C7AA8F40  // io_write
                                         [flush] => function: 00007FF9A60490D0  // io_flush
                                       }
                               [coroutine] => table: 00000226C79D0250 {
                                                [create] => function: 00007FF9A603CDA0  // luaB_cocreate
                                                [status] => function: 00007FF9A603D060  // luaB_costatus
                                                [resume] => function: 00007FF9A603CBE0  // luaB_coresume
                                                [wrap] => function: 00007FF9A603CE50  // luaB_cowrap
                                                [isyieldable] => function: 00007FF9A603D470  // luaB_yieldable
                                                [yield] => function: 00007FF9A603CFC0  // luaB_yield
                                                [running] => function: 00007FF9A603D4A0  // luaB_corunning
                                              }
                               [test3] => table: 000001CB6C2BC9F0 {
                                            [func1] => function: 000001CB6C291540
                                            [var1] => 100
                                          }
                               [debug] => table: 00000226C79CFE90 {
                                            [sethook] => function: 00007FF9A603EFD0   // db_sethook
                                            [setlocal] => function: 00007FF9A603E440  // db_setlocal
                                            [getregistry] => function: 00007FF9A603D650  // db_getregistry
                                            [traceback] => function: 00007FF9A603FD90  // db_traceback
                                            [upvalueid] => function: 00007FF9A603E960  // db_upvalueid
                                            [getlocal] => function: 00007FF9A603E0F0  // db_getlocal
                                            [debug] => function: 00007FF9A603F9A0  // db_debug
                                            [getupvalue] => function: 00007FF9A603E910  // db_getupvalue
                                            [getuservalue] => function: 00007FF9A603D7A0  // db_getuservalue
                                            [setuservalue] => function: 00007FF9A603D800  // db_setuservalue
                                            [setmetatable] => function: 00007FF9A603D720  // db_setmetatable
                                            [setupvalue] => function: 00007FF9A603E920  // db_setupvalue
                                            [gethook] => function: 00007FF9A603F690  // db_gethook
                                            [upvaluejoin] => function: 00007FF9A603EB20  // db_upvaluejoin
                                            [getmetatable] => function: 00007FF9A603D670  // db_getmetatable
                                            [getinfo] => function: 00007FF9A603D9D0  // db_getinfo
                                          }
                               [math] => table: 00000226C79D0050 {
                                           [tointeger] => function: 00007FF9A604BDF0  // math_toint
                                           [log] => function: 00007FF9A604C720  // math_log
                                           [ceil] => function: 00007FF9A604C000  // math_ceil
                                           [huge] => inf
                                           [abs] => function: 00007FF9A604B700  // math_abs
                                           [modf] => function: 00007FF9A604C3D0  // math_modf
                                           [maxinteger] => 9223372036854775807
                                           [acos] => function: 00007FF9A604BB80  // math_acos
                                           [mininteger] => -9223372036854775808
                                           [atan] => function: 00007FF9A604BC50  // math_atan
                                           [pi] => 3.1415926535898
                                           [random] => function: 00007FF9A604CCA0  // math_random
                                           [type] => function: 00007FF9A604CF60  // math_type
                                           [cos] => function: 00007FF9A604B910  // math_cos
                                           [sqrt] => function: 00007FF9A604C560  // math_sqrt
                                           [tan] => function: 00007FF9A604B9E0  // math_tan
                                           [randomseed] => function: 00007FF9A604CEA0  // math_randomseed
                                           [fmod] => function: 00007FF9A604C150  // math_fmod
                                           [asin] => function: 00007FF9A604BAB0  // math_asin
                                           [deg] => function: 00007FF9A604C9C0  // math_deg
                                           [rad] => function: 00007FF9A604CA90  // math_rad
                                           [min] => function: 00007FF9A604CB60  // math_min
                                           [max] => function: 00007FF9A604CC00  // math_max
                                           [ult] => function: 00007FF9A604C640  // math_ult
                                           [floor] => function: 00007FF9A604BEB0  // math_floor
                                           [exp] => function: 00007FF9A604C8F0  // math_exp
                                           [sin] => function: 00007FF9A604B840  // math_sin
                                         }
                               [string] => table: 00000226C79CFDD0 {
                                             [gmatch] => function: 00007FF9A605EB90  // gmatch
                                             [len] => function: 00007FF9A605C6D0  // str_len
                                             [packsize] => function: 00007FF9A60619A0  // str_packsize
                                             [dump] => function: 00007FF9A605D6B0  // str_dump
                                             [match] => function: 00007FF9A605EA50  // str_match
                                             [rep] => function: 00007FF9A605CEF0  // str_rep
                                             [unpack] => function: 00007FF9A6061CB0  // str_unpack
                                             [format] => function: 00007FF9A605FB10  // str_format
                                             [reverse] => function: 00007FF9A605CA00  // str_reverse
                                             [lower] => function: 00007FF9A605CBB0  // str_lower
                                             [pack] => function: 00007FF9A60608E0  // str_pack
                                             [upper] => function: 00007FF9A605CD50 // str_upper
                                             [sub] => function: 00007FF9A605C790  // str_sub
                                             [find] => function: 00007FF9A605EA40  // str_find
                                             [gsub] => function: 00007FF9A605F2F0  // str_gsub
                                             [byte] => function: 00007FF9A605D2D0  // str_byte
                                             [char] => function: 00007FF9A605D520  // str_char
                                           }
                               [os] => table: 00000226C79CFF90 {
                                         [clock] => function: 00007FF9A6050FA0  // os_clock
                                         [time] => function: 00007FF9A60516C0  // os_time
                                         [date] => function: 00007FF9A60511B0  // os_date
                                         [difftime] => function: 00007FF9A6051BE0  // os_difftime
                                         [execute] => function: 00007FF9A6050AE0  // os_execute
                                         [setlocale] => function: 00007FF9A6051CC0  // os_setlocale
                                         [getenv] => function: 00007FF9A6050EB0  // os_getenv
                                         [rename] => function: 00007FF9A6050CE0  // os_rename
                                         [remove] => function: 00007FF9A6050BC0  // os_remove
                                         [tmpname] => function: 00007FF9A6050E20  // os_tmpname
                                         [exit] => function: 00007FF9A6051EE0  // os_exit
                                       }
                               [_G] => table: 00000226C79D02D0 {
                                         *** has print ***
                                       }
                             }
                 [searchpath] => function: 00007FF9A604E150  // ll_searchpath
                 [preload] => table: 00000226C79D0390 {
                              }
                 [config] => "\
;
?
!
-
"
                 [searchers] => table: 00000226C79CFD50 {
                                  [1] => function: 00000226C79D00D0
                                  [2] => function: 00000226C79D0290  // LuaLoader_Callback
                                  [3] => function: 00000226C79D0110
                                  [4] => function: 00000226C79D0350
                                }
                 [loadlib] => function: 00007FF9A604DCE0  // ll_loadlib
                 [path] => "I:\pubcode\LuaTest\LuaCode/?.lua"
               }
  [dofile] => function: 00007FF9A6039E70
  [require] => function: 00000226C79CFFD0
  [tostring] => function: 00007FF9A603A5E0
  [rawlen] => function: 00007FF9A6038CB0
  [next] => function: 00007FF9A60391B0
  [assert] => function: 00007FF9A603A060
  [xpcall] => function: 00007FF9A603A410
  [table] => table: 00000226C79D0210 {
               *** has print ***
             }
  [type] => function: 00007FF9A6039110
  [gt] => table: 000001CB6C2BBD30 {
            [1] => 120
            [key1] => "Hello"
          }
  [error] => function: 00007FF9A60389D0
  [pairs] => function: 00007FF9A6039290
  [loadfile] => function: 00007FF9A6039700
  [rawset] => function: 00007FF9A6038E20
  [collectgarbage] => function: 00007FF9A6038EE0
  [select] => function: 00007FF9A603A100
  [pcall] => function: 00007FF9A603A2B0
  [tonumber] => 
                       
                    
                    
 
                      





鲜花




握手




雷人




路过




鸡蛋
该文章已有0人参与评论

请发表评论

全部评论

专题导读
More+
上一篇：
C调用lua的table里面的函数发布时间：2022-07-22
下一篇：
Lua如何调用C打包的动态库发布时间：2022-07-22
热门推荐
More+
热门话题
More+
阅读排行榜

扫描微信二维码

查看手机版网站

随时了解更新最新资讯

139-2527-9053

在线客服（服务时间 9:00～18:00）

在线QQ客服
地址：深圳市南山区西丽大学城创智工业园
电邮：jeky_zhao#qq.com
移动电话：139-2527-9053

Powered by 互联科技 X3.4© 2001-2213 极客世界.|Sitemap