Changeset 8080 in orxonox.OLD for branches

Timestamp:

Jun 1, 2006, 4:25:03 PM (19 years ago)

Author:

snellen

Message:

added example how to return values to lua

Location:

branches/script_engine/src/lib/script_engine

Files:

• account.cc (modified) (2 diffs)
• lunartest2.lua (modified) (1 diff)

branches/script_engine/src/lib/script_engine/account.cc

@@ -43 +43 @@
 
         //lua Interface
-        int getCallCount(lua_State* L){int calls = getCallCount(); lua_pushnumber(L,(lua_Number)calls);return 1;}
+        //function that returns a value to lua
+        int getCallCount(lua_State* L)
+        {
+         int calls = getCallCount();
+         lua_pushnumber(L,(lua_Number)calls); 
+         return 1; // return number of values that the function wants to return to lua
+        }
 
+         //function that takes an argument from lua
+         int takeParam(lua_State* L)
+         { 
+          int param = (int)lua_tonumber(L,-1);
+          takeParam(param);
+          return 0; 
+         }
+
+        //meber functions
+        void takeParam(int i)
+        {
+         printf("Lua passed %i to c++\n",i);
+        }
 
         int printName(lua_State* L)
@@ -65 +84 @@
       method(Object, printName),
       method(Object, getCallCount),
+      method(Object, takeParam),
       {0,0}
     };

branches/script_engine/src/lib/script_engine/lunartest2.lua

@@ -18 +18 @@
   io.write("main received ", arg)
   io.write(" as parameter\n")
+  --call member
   Obj:printName()
+
+  --create object
+
+  o = Object()
+  o:printName()
+
+  --take returnvalue from c
   callCount = Obj:getCallCount()
   io.write("callCount is now ",callCount)
   io.write("\n")
+  
+  --pass parameters to a c++ method
+  Obj:takeParam(3)
 
+  --print object information
   print('a =', a)
   print('b =', b)