Lua and C + + Interactive learning record four: Global table interaction

The main content is reproduced from: Zilong People Blog (strongly recommended to go to the sub-Longshan blog completely learn it again)

Part of the content is read from: "Lua 5.3 Reference Manual," the Chinese version of the translator Cloud wind production KAVCC

vs2013+lua-5.3.3

1.c++ reading a table in Lua

① set a global table in Hello.lua:

1 2.34 " test_string "}

② read in C + +

1         //lua->stack, get global table, position -12Lua_getglobal (L,"global_c_read_table");3 4         //-------------------Get the first value----------------------------5         //C->STATCK, set the key value, position 1 (above-1 to-2)6Lua_pushstring (L,"Integer_val");7 8         //Lua->statck, the 1-bit key value pops up, the value of the corresponding key is obtained from LUA, and the result is placed in the position of-19         //If there is no value, the result is TnilTenLua_gettable (L,-2); One  A         //statck->c -         if(Lua_isinteger (L,-1)){ -printf"integer_val:%lld\n", Lua_tointeger (L,-1)); the         } -  -         //Popup-1-bit result, after which the global table's position is restored to-1 -Lua_pop (L,1); +  -         //-------------------Repeat the above steps to get the second value---------------------------- +Lua_pushstring (L,"Double_val"); ALua_gettable (L,-2); at         if(Lua_isnumber (L,-1)){ -printf"double_val:%g\n", Lua_tonumber (L,-1)); -         } -Lua_pop (L,1); -         //-------------------Repeat the above steps to get a third value---------------------------- -Lua_pushstring (L,"String_val"); inLua_gettable (L,-2); -         if(Lua_isstring (L,-1)){ toprintf"string_val:%s\n", Lua_tostring (L,-1)); +         } -Lua_pop (L,1);

2.c++ Writing tables to Lua

①c++ Write

1         //C->stack, create a new table and put it in the position of-12 lua_newtable (L);3 4         //C->stack, add a key, put it in the position of-1, the table position becomes-25Lua_pushstring (L,"Integer_val");6 7         //C->stack, add the value corresponding to the key, put in the-1 position, the key position becomes -2,table position becomes-38Lua_pushinteger (L,1);9         Ten         //set the key and Val to the table and eject the key and Val, where the table position becomes-1 OneLua_settable (L,-3); A  -         //Stack->lua, the table is assigned to LUA and the table pops up -Lua_setglobal (L,"global_c_write_table");

② in Hello.lua for LUA reading

1  for inch Pairs  Do 2     Print ("", K,"", v) 3 End

Lua and C + + Interactive learning record four: Global table interaction