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Assertion failure in -[NSNextStepFrame lockFocus]
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Assertion failure in -[NSNextStepFrame lockFocus]


  • Subject: Assertion failure in -[NSNextStepFrame lockFocus]
  • From: "Apparao Mulpuri" <email@hidden>
  • Date: Wed, 14 May 2008 19:00:20 +0530

HI,

   I have a Cocoa based multi monitor application,which will run on
Mac OS X 10.3.9 onwards.

   It is working as expected in 10.3.9  and Tiger os versions. But, in
Leopard 10.5.2, its giving following exception:

** Assertion failure in -[NSNextStepFrame lockFocus],
/SourceCache/AppKit/AppKit-949.27/AppKit.subproj/NSView.m:4751
May 14 17:37:39 apparao-power-mac-g5 MyCocoaApp[123]:
-[NSNextStepFrame(0x143610) lockFocus] failed with window=0x142e60,
windowNumber=62, [self isHiddenOrHasHiddenAncestor]

  For single monitor with Leopard its working fine. With secondary
monitor, its throwing above exception. In Secondary monitor case, i am
doing window(which is custom class of NSWindow and created in IB) copy
operation(using achieving and unarchieving) and displaying it on
secondary monitor.

  I am not getting any idea from the above exception. By google, i
found that, some one is experienced the same exception with custom
window creation on Leopard.

  Any pointers on this is really appreciated.

Thanks,
- Apparao.
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