CODEWITHSUNDEEP
c++clua
霜月幻夜
霜月幻夜

Reputation: 85

How to create a lua table from a string?

I have a c function, used to return a table to lua, but the table is created from a string, not lua_newtable, how to do this?

int GetTable(lua_State* L)
{
    //this string is generated at runtime, so i can not use lua_newtable
    const char* TableFromStr = "{a = 123, b = 456, d = {x = 1, y = 9} }";
    //i want to push the table to the top stack
    luaL_loadstring(L, TableFromStr);
    //return 1 table, lua code can get the table
    return 1;
}

Upvotes: 1

Views: 307

Answers (1)

Konrad
Konrad

Reputation: 7198

You have to use luaL_dostring

https://www.lua.org/manual/5.1/manual.html#luaL_dostring

If you're using Lua 5.1 make sure luaL_dostring is correctly defined. See: http://lua-users.org/lists/lua-l/2006-04/msg00218.html

In Lua 5.1, luaL_dostring is defined as luaL_loadstring(L, s) || lua_pcall(L, 0, 0, 0)

and so it ignores returns.

Try this:

#undef luaL_dostring
#define luaL_dostring(L,s)    \   (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))

It's possible that you will also have to prepend your string with return

Upvotes: 3

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