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Calling lua functions from C++ with luabind?

CodaKiller · 2009-05-18T03:16:09

I've been trying to call a lua function from C++ so I can run event functions but I can't get it to work. I have to send a reference to a window to the function so that it will know which window is being closed. Here is what I tried: luabind::call_function<E_WINDOW*>(g_Lua, "On_WindowClose", g_Windows); E_WINDOW is my window class and it's been added to luabind, g_Lua is the global lua state, "On_WindowClose" is the name of the event function I'm trying to call and g_Windows is a vector of all windows that have been created. Here is the lua code: // Create window. WindowDesc = Window_Desc() WindowDesc.name = "Ether" WindowDesc.icon = "Ether.ico" WindowDesc.left = 0 WindowDesc.top = 0 WindowDesc.width = 1024 WindowDesc.height = 768 WindowDesc.close = true WindowDesc.maximize = false WindowDesc.minimize = true WindowDesc.sizeable = false GameWindow = Window( WindowDesc ) //Close window event function. function On_WindowClose( window ) if (window == GameWindow) then Exit() end end Here is the error I get: Quote: First-chance exception at 0x764cf328 in Ether.exe: Microsoft C++ exception: luabind::error at memory location 0x0017f6b0.. The program '[7520] Ether.exe: Native' has exited with code 0 (0x0). And lastly this is the function it crashes on in the luabind header: // pops the return values from the function call stack_pop pop(L, lua_gettop(L) - top + m_params); My guess as to whats going wrong is that I can't send pointers to classes like that or something. [Edited by - CodaKiller on May 16, 2009 11:09:06 AM]

General and Gameplay Programming Programming

Started by CodaKiller May 16, 2009 10:26 AM

12 comments, last by CodaKiller 14 years, 11 months ago

bobofjoe

322

May 17, 2009 08:17 PM

Looks like you never define operator==.

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CodaKiller

108

Author

May 18, 2009 12:09 AM

Quote:Original post by bobofjoe
Looks like you never define operator==.

I don't understand, can you clarify your statement please? I've never heard of operator until today and I have no idea what I need to do.

I thought you may be talking about the std operators so I tried this:

	bool std::operator==(E_WINDOW);

But it returns the same error as the luabind operators:

Quote:
1>.\Main.cpp(966) : error C2838: '==' : illegal qualified name in member declaration

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Fire Lancer

189

May 18, 2009 02:37 AM

You need to define how the operator works in the context of your class, eg:

class MyClass{    int x;public:    MyClass(int _x):x(_x){}    bool operator ==(const MyClass&rhs)    {        return x == rhs.x;    }};int main(){    MyClass a(5), b(10), c(5);    a == a;//true    a == b;//false    a == c;//true    b == c;//false};

CodaKiller

108

Author

May 18, 2009 03:16 AM

Quote:Original post by Fire Lancer
You need to define how the operator works in the context of your class, eg:
*** Source Snippet Removed ***

Yay!!! It works! Thanks guys!

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