Register Version String in C-Library for Lua

[Kritzel Kratzel]

I have written a small C-library (Windows DLL) for implementing the ping command for Lua, in which functions are registered as metamethods in the usual way. I like to extend this code with a version string feature:

lp = require "luaping"

print(lp._VERSION)

LuaPing 1.0

Is it possible to do this via the C API of Lua? If yes, how do I do this?

Thanks,

KK

...
static const struct luaL_Reg luaping_metamethods [] = {
  {"__call", luaping_ping},
  {"__call", luaping_timeout},
  {"__call", luaping_settimeout},
  {NULL, NULL}
};

static const struct luaL_Reg luaping_funcs [] = {
  {"ping", luaping_ping},
  {"timeout", luaping_timeout},
  {"settimeout", luaping_settimeout},
  {NULL, NULL}
};

DLL int luaopen_luaping(lua_State *L){
  luaL_newlib(L, luaping_funcs);
  luaL_newlib(L, luaping_metamethods);
  lua_setmetatable(L, -2);
  return 1;
}

[Sean Conner]

It was thus said that the Great 'Kritzel Kratzel' via lua-l once stated:
> I have written a small C-library (Windows DLL) for implementing the *ping*

> command for Lua, in which functions are registered as metamethods in the
> usual way. I like to extend this code with a version string feature:
>
> lp = require "luaping"
> print(lp._VERSION)
> LuaPing 1.0
>
> Is it possible to do this via the C API of Lua? If yes, how do I do this?
>
> Thanks,
> KK
>

> DLL int luaopen_luaping(lua_State *L){
> luaL_newlib(L, luaping_funcs);
> luaL_newlib(L, luaping_metamethods);
> lua_setmetatable(L, -2);
> return 1;
> }

Yes, thusly:

DLL int luaopen_luaping(lua_State *L){
luaL_newlib(L,luaping_funcs);
luaL_newlib(L,luaping_metamethods);
lua_setmetatable(L, -2);
lua_pushlstring(L,"LuaPing 1.0");
lua_setfield(L,-2,"_VERSION");
return 1;
}

-spc

[Sainan]

> lua_pushlstring(L,"LuaPing 1.0");

You probably meant lua_pushliteral or lua_pushstring.

[Sean Conner]

It was thus said that the Great 'Sainan' via lua-l once stated:

> > lua_pushlstring(L,"LuaPing 1.0");
>
> You probably meant lua_pushliteral or lua_pushstring.

Yes. I think I was partly on qutopilot there.

-spc

[Kritzel Kratzel]

Many thanks, works as expected.

-KK

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