- Problem solved again

From: [at]} <Alexander>
Date: Wed, 6 Sep 2006 12:55:41 +0700

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Hello, Marc!

MM> Oh, I spoke too soon... this new fix causes a crash where
MM> the standard distribution and the original fix did not.
MM> If my trajectory code opens a window which is sized larger
MM> than the Blackbox application window, the original BB 1.5
MM> added scrollbars to the Blackbar application window.
MM> With the new fix, I instead get a trap:

MM> -------------------------------------------------------------

MM> NIL dereference (read)

MM> Ports.Frame.Input [00000859H]
MM> .f Ports.Frame [011138D0H]
MM> .isDown BOOLEAN FALSE
MM> .modifiers SET {3, 5, 6, 10, 12..15, 17, 21}
MM> .u INTEGER 1642418874
MM> .x INTEGER 17530272
MM> .y INTEGER 1652315891

MM> -------------------------------------------------------------

MM> So, again, back to the original fix, which was efficient
MM> and didn't crash!

  What's interesting about this trap is that it doesn't point to a
  modified code. It points to Ports module instead of HostPorts.
  What is the exact position of NIL dereference? As I can see from
  above, "f" is assigned. "f.unit", "f.gx" and "f.gy" are all
  INTEGERs, so nothing to dereference here. The only thing that may be
  NIL is "f.rider" which is not shown in this trap. But I can't see
  how my patch could cause that.

  The only thing I can imagine is that "SetDC" that I removed from
  HostWindows. To check whether it is the trouble, please, combine
  HostWindows from the old patch with HostPorts and Services from the
  new patch.

  PS: I wish someone competent from OM would join us in this
  discussion...

---=====---
 Alexander

--- BlackBox
--- send subject HELP or UNSUBSCRIBE to blackbox{([at]})nowhere.xy



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Received on Wed Sep 06 2006 - 07:55:41 UTC