Passing arrays from LUA to C++
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- Subject: Passing arrays from LUA to C++
- From: <Andreas.Volz@...>
- Date: 2007年8月23日 16:35:16 +0200
Hello,
I'm using tolua++ to embedd LUA in my C++ application. Works for most stuff, but now I like to give a array with dynamic size from LUA to C++. tolua++ is only able to handle fixed size arrays. So I try to mix tolua++ with the LUA C-API. I used some example code to get starting.
This is my C++ function:
void TestClass::X(lua_State *L, lua_Object t, lua_Object o2)
{
if (lua_istable (L, t))
{
printf ("1: is a table");
}
else
{
printf ("1: isn't a table");
}
/* table is in the stack at index 't' */
lua_pushnil(L); /* first key */
while (lua_next(L, t) != 0) {
/* uses 'key' (at index -2) and 'value' (at index -1) */
printf("%s - %s : %d\n",
lua_typename(L, lua_type(L, -2)),
lua_typename(L, lua_type(L, -1)),
lua_tonumber(L, -1)
);
/* removes 'value'; keeps 'key' for next iteration */
lua_pop(L, 1);
}
double number = lua_tonumber(L, o2);
printf ("Parameter1: %f", number);
return;
}
This is my LUA function:
function eb_test2()
tc=TestClass:new()
a={4,5,"hello",7}
tc:X(a,8)
end
Here is the result:
C++: TestClass::TestClass ()
1: is a table
number - number : 1023
number - number : 1024
number - string : 1
number - number : 1025
Parameter1: 8.000000
The C++ code does detect the table type, the correct table size and the element types (string/number). But I don't understand the values I get (1023,1024,1,1025). Ok, the string is for sure handled wrong with lua_tonumber, but also the other numbers are wrong. Could anyone tell me why this happens?
regards
Andreas Volz
--
Dipl.-Inf. (FH) Andreas Volz, ES1
Elektrobit
Phone: +49 (9131) 7701 167, mailto:Andreas.Volz@elektrobit.com
Fax: +49 (9131) 7701 333, http://www.elektrobit.com
Elektrobit Automotive GmbH, Am Wolfsmantel 46, 91058 Erlangen, Germany
Managing Director Otto Fößel
Register Court Fürth HRB 4886
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