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Re: Interface Builder Plugin Dependency
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Re: Interface Builder Plugin Dependency


  • Subject: Re: Interface Builder Plugin Dependency
  • From: Jonathan Hess <email@hidden>
  • Date: Thu, 29 Jan 2009 18:01:27 -0800

Hey Bridger -

Does your plug-in and framework really need to create and crop an image while being unarchived and re-archived by ibtool? Perhaps you could retool your class so that the work happens lazily, and doesn't occur durring XIB compilation.

As Joey said, ibtool to runs with no window server connection to support headless build machines.

Also, if you wouldn't mind, could you file a bug report about the missing information in the Xcode build log?

Good Luck -
Jon Hess

On Jan 29, 2009, at 4:09 PM, Gary L. Wade wrote:

Looks like your plug-in is being running as a tool without a connection to
the window server.


On 01/29/2009 3:54 PM, "Bridger Maxwell" <email@hidden> wrote:

It turns out the error is completely different from what I thought it was
(isn't it always?). It turns out Xcode was omitting part of the output from
IBTool. When I tried to compile my xib from Terminal, I got this error:


Description: ibtool encountered an error while loading the ibplugin from
/Users/bridger/Development/Mercury/MercuryStation/build/Debug/ SCMercury.framew
ork/Versions/A/Resources/SCThemes.ibplugin.
Error: Error Domain=com.apple.InterfaceBuilder Code=-1 UserInfo=0x6e9e90
"Interface Builder could not load the 'Themes' plug-in because an exception
was raised.


Exception name: NSInternalInconsistencyException
Reason: Error (1002) creating CGSWindow"

I Googled around a bit, and I know it has something to do with drawing. In
fact, I have narrowed it down to these lines of code:


   NSImage * canvas = [[NSImage alloc] initWithSize: canvas_size];

   [canvas lockFocus];

...

   [canvas unlockFocus];


This is a vital part of my plugin though. I use this in an NSImage category
which crops an NSImage. Why does lockFocus cause IB compilation errors, and
can how can I fix it?



Also, here is the NSImage category in its entirety. I actually took it from
someone else on this list a while back.



- (NSImage *) imageFromRect: (NSRect) rect

{

   NSAffineTransform * xform = [NSAffineTransform transform];

    // translate reference frame to map rectangle 'rect' into first
quadrant

   [xform translateXBy: -rect.origin.x

                   yBy: -rect.origin.y];



   NSSize canvas_size = [xform transformSize: rect.size];

    NSImage * canvas = [[NSImage alloc] initWithSize: canvas_size];

   [canvas lockFocus];

    [xform concat];



   // Get NSImageRep of image

   NSImageRep * rep = [self bestRepresentationForDevice: nil];


[rep drawAtPoint: NSZeroPoint];



   [canvas unlockFocus];

   return [canvas autorelease];

return nil;

}


Thank You,

Bridger Maxwell


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