OpenEuphoria

Subclassing crash

• Posted by George Papadopoulos <georgp at otenet.gr> Jan 24, 2003
• 490 views

Hi all

Please, take a look at this:

--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D

function ControlProc (atom hWnd,atom wMsg,atom wParam,atom lParam)

integer  c , ret

c=3D1

ret=3Dc_func(CallWindowProc,{SubControl, hWnd, wMsg, wParam, lParam})

      if c then  end if

return ret

end function

SubControl=3Dcall_back(routine_id("ControlProc"))

--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

It's the  hook procedure for a subclassed control.
On execution, i get a machine level crash with a message like:

"The instruction at 0040bd67 referenced memory at fffffff8
The memory could not be read from
Click on OK to terminate the application"

If i comment line "if c then end if", works ok.
It seems like var c has been destroyed.
If i declare c outside the function, works ok, also.
Why does it happens?

Thanks
-George-