Is it possible to add a function to Lua via C++ that returns a string? -edit- Ok, this code wont work. Any help?
int flua_getinput(lua_State *L){
if(lua_isstring(L,1)){
cout << lua_tostring(L,1);
cin >> input;
cout << "\n";
lua_pushstring(L,input);
}else{
cin >> input;
cout << "\n";
lua_pushstring(L,input);
}
return 1;
}
Registering Function:
lua_register(L,"getinput",flua_getinput);
Are you trying to do something like this?
int lua_input(lua_State* L) {
string input;
cin >> input;
lua_pushstring(L, input.c_str());
return 1;
}
int main() {
lua_State* L=lua_open();
luaL_openlibs(L);
lua_register(L,"input",lua_input);
luaL_loadstring(L, "for i=1,4 do print('you typed '..input()); end");
lua_pcall(L, 0, 0, 0);
}
Have you checked out Programming in Lua?
The easiest way is to use luabind. It automatically detects and deals with std::string so you can simply take a function like, std::string f() and bind it to lua, and it'll automatically be converted to a native lua string when the lua script calls it.
If you are getting the error attempt to call global 'getinput' (a nil value) then the problem is that the lua_register call is not being hit. The getinput function must be loaded by calling the registration function, or by using require if it is in a library.
