Linux下编写Lua扩展so文件和调用方法实例

代码如下：

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <errno.h>

#include <string.h>

 

#include <unistd.h>

#include <fcntl.h>

#include <sys/stat.h>

#include <limits.h>

 



#include <math.h>

#include "lua.h"

#include "lualib.h"

#include "lauxlib.h"




/*  库 open 函数的前置声明   */

int luaopen_mylib(lua_State *L);




static int l_sin (lua_State *L) 

{

double d = luaL_checknumber(L, 1);

lua_pushnumber(L, sin(d));

//printf("ok now is  luahook!\n");

return 1; /* number of results */

}




static const luaL_Reg mylib[] =

{

{"lsin", l_sin},

{NULL, NULL} /* 必须以NULL结尾 */

};




 int luaopen_mylib(lua_State *L) 

{

  luaI_openlib(L, "mylib", mylib, 0);

return 1;

}

如果是.cpp文件，在luaopen_mylib一定要加 extern "C", 否则导出的函数会被重命名，切记切记

编译：gcc mylibs.c -fPIC -shared -o libmylib.so -llua

代码如下：

Makefile文件

CXX =gcc

LIBNAME:=libmylib.so

HDRNAME:=mylibs.c

TARGETNAME:=mylibs

CNAME:=$(patsubst %,%.c,$(TARGETNAME))

ONAME:=$(patsubst %,%.o,$(TARGETNAME))

all:libmylib

libmylib: $(ONAME)

$(CXX) -g -shared -Wl,$(LIBNAME) \

-o $(LIBNAME) $(ONAME) -llua

%.o: %.c

$(CXX) -fPIC -c -Wall $(CNAME)clean:$(RM) *.o *.so

代码如下：

local one, two, three = package.loadlib("libmylib.so", "luaopen_mylib")()

print(mylib.lsin(10))