[Pipmak-Devel] mouseloc() crash: Bug in loadnode?

[Andrea V. <and...@gm...>]

Hi Christian,

if you try this project:

main.lua
  version (0.27)
  title "test-mouse"
  startnode (1)

1.lua
  panel { "image.png",....}
  posx,posy=pipmak.mouseloc()
  pipmak.print(posx," ",posy)

Pipmak crash with access violation (this not happen with pipmak.clickloc() )

I'm investigated a little:

The access violation is caused by member-method thisCNode->mouseXYtoHV
which it isn't initialized as all of the methods of CNode
at time of calling mouselocLua()!

  pipmakLuaLib.c:
    static int mouselocLua(lua_State *L)
       thisCNode->mouseXYtoHV(thisCNode, mouseX, mouseY, &h, &v);

This is the calling sequence which cause te error:

  nodes.c:
    CNode *loadNode(int nodeID)
      .....
      .....
      /* at this point mouseXYtoHV isn't initialized */
      call pipmak_internal.loadnode from default.lua
           ....
           default.lua:  --now execution continue in lua
             luaDofile("node.lua")
              which call mouselocLua
                which call mouseXYtoHV  -->not defined: error!!!
      .....
      .....
      /* now mouseXYtoHV is initialized but it too late!!!*/
      case NODE_TYPE_PANEL:
        makePanelCNode(thisCNode);  //this initialize mouseXYtoHV !!!
      .....
      .....


I think it should be possible which the problem happen also with other
functions...

I think you have to move the initializing of methods of CNode before calling
pipmak_internal.loadnode

It's very interesting how you have implemented OOP in C, I never seen
before!

Andrea