[ZeroBrane Studio] RES: Re: Call arbitrary Windows DLL Function
- From: "William Wolff" <wolff@xxxxxxxxxx>
- To: <zerobrane@xxxxxxxxxxxxx>
- Date: Thu, 2 Oct 2014 19:52:23 -0300
Hi Steve,
I´m starting now with Zerobrane too, but this question is about Lua Itself
where i can help a little.
To reach the result you want probably the main problem you will face off is
about the LuaThread you need open to have the same context of execution between
the components.
Since in your proxy DLL , or in a App running toguether , you have the same
entry point on the application(where you open the first Luathread to bind your
functions)
The Treads in Lua are interesting because after you create the first one, you
can open as many you need just “copying “ it from the original thread , and in
this way all the components working as one main
Lua execution.
I have this implemented on my 3D engine and its working fine where I have 3
LuaThreads working with the same script to run the game(1 for the game, 1 for
the 3D component (DLL), 1 for the system parameters)
And they can share informations where in the Game script you can change the
system parameters in execution time if you want.
I hope it helps.
Kind Regards.
Wolff
De: zerobrane-bounce@xxxxxxxxxxxxx [mailto:zerobrane-bounce@xxxxxxxxxxxxx] Em
nome de Rob Probin
Enviada em: quinta-feira, 2 de outubro de 2014 04:11
Para: zerobrane@xxxxxxxxxxxxx
Assunto: [ZeroBrane Studio] Re: Call arbitrary Windows DLL Function
Not sure about the Lua built into ZBS, but standard Lua doesn't support such
things without extension. But that's not difficult.
For instance LuaforWindows https://code.google.com/p/luaforwindows/ has various
extension libraries, for instance Alien - which allows access to unknown DLLs.
There are other ones like LuaInterface that allows access to the CLR.
You can use Alien even if you are not using LuaForWindows - it's available as a
LuaRock, for instance, the Lua package manager.
On 1 Oct 2014, at 11:56, "Steve Russell" <steve.russell@xxxxxxxxxxxxxxxxxxxxx>
wrote:
Hi,
Does anybody know if it is possible to call a function in any system DLL in
Windows/Lua 5.2/ZBS?
I would like to call 3rd party and system functions. Ideally I’d call the DLL
functions from Lua directly, but I’m also considering writing a proxy DLL for
Lua to load and this would then load the 3rd party DLL and interact with the
functions contained therein.
I started by creating a Win32 DLL in VS2010 but Lua command line and ZBS 0.80
hang/crash during the ‘require(“LuaProxy”)’, here’s the C code:
// LuaProxy.cpp : Defines the exported functions for the DLL application.
//
#include "stdafx.h"
#include <iostream>
// LuaProxy.cpp : Defines the exported functions for the DLL application.
//
#include <lua.hpp>
extern "C"
{
static int funval = 10;
static int function_1(lua_State* l)
{
std::cout << "[DLL] Function 1 is very funny." << std::endl;
std::cout << "[DLL] It's fun value is: " << funval << std::endl;
lua_pushnumber(l, funval);
return 1;
}
static int function_2(lua_State* l)
{
std::cout << "[DLL] Function 2 is twice as funny!" << std::endl;
std::cout << "[DLL] It's fun value is: " << 2*funval << std::endl;
lua_pushnumber(l, 2*funval);
return 1;
}
/*
* Registering functions
*/
static const struct luaL_Reg cfunctions[] = {
{"fun1", function_1},
{"fun2", function_2},
{NULL, NULL}
};
int __declspec(dllexport) luaopen_LuaProxy(lua_State* l)
{
// luaL_newlibtable(l, cfunctions);
// luaL_setfuncs(l, cfunctions, 0);
luaL_openlib(l, "lp", cfunctions, 0);
std::cout << "fun1(), fun2()" << std::endl;
return 1;
}
} // end extern "C"
Cheers,
Steve
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