CODEWITHSUNDEEP
cwindowslua
AlgoRythm
AlgoRythm

Reputation: 1389

Lua c lib Windows: The specified procedure could not be found

I have Lua 5.3.5 64-bit installed on my machine. I am compiling a 64-bit dll to test the c api process. Here is my file, driver.c:

#define LUA_LIB

#include "lua/lua.h"
#include "lua/lualib.h"
#include "lua/lauxlib.h"

static int returnone(lua_State *L) {
    return 1;
}

static const luaL_Reg lualib[] = {
    {"returnone", returnone},
    {NULL, NULL}
};

int luaopen_lualib(lua_State *L) {
    luaL_newlib(L, lualib);
    return 1;
}

This outputs to lualib.dll

I created a script, test.lua in the same directory as lualib.dll.

require("lualib");

I get this:

$ lua.exe test.lua
C:\Program Files\Lua\lua.exe: error loading module 'lualib' from file '.\lualib.dll':
        The specified procedure could not be found.

stack traceback:
        [C]: in ?
        [C]: in function 'require'
        test.lua:1: in main chunk
        [C]: in ?

Then I try

print(package.loadlib("lualib", "luaopen_lualib"));

And I get

$ lua.exe test.lua
nil     The specified procedure could not be found.
        init

I am stumped. Where's my library?

Upvotes: 2

Views: 1612

Answers (1)

Aki
Aki

Reputation: 2938

When building to Lua module to windows DLL you need to use __declspec(dllexport) e.g. this should be enough for the most simple cases:

__declspec(dllexport) int luaopen_lualib(lua_State *L) {
    luaL_newlib(L, lualib);
    return 1;
}

Please refer to Building Modules on lua-users.

As for a more verbose example I would suggest luasocket: source, header.

Upvotes: 5

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