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NSImage and PDF

One thing that seems to annoy people about NSImage is the fact that although you can get TIFF data by using the -TIFFRepresentation method, there is no obvious way to turn one directly into a PDF. This seems like an odd omission when you consider that Quartz directly supports PDF… anyway, I thought I'd rectify the situation by posting some code that implements a -PDFRepresentation method.

Anyway, here's the code, for those that want to have a look. By the way, I'd be interested to hear any comments anyone may have as to the approach I took to do this.

Update: I've just fixed the link to the code, which broke when I re-organised my site.

Posted by alastair on September 17, 2003 at 6:39 PM Digg It | | Comments (5) | TrackBacks (0)

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The link seems to be broken again. :-(

Posted by Code on February 5, 2004 1:53 AM

Not any more it isn't. I messed-up and forgot to move the file to the right place :-(

Posted by Alastair on February 5, 2004 6:28 PM

At least on 10.3, [image PDFRepresentation] crashes if the image was created from a PDF with the following exception:

2005-02-05 18:49:25.889 DrawBot[4660] *** -focusStack only defined for abstract class. Define -[PDFGraphicsContext focusStack]!

Do you have any idea how to implement focusStack and setFocusStack?

(I'm actually not so much interested in the PDFRepresentation category on NSImage, but rather I'm looking for a way to draw into a CGContext with Cocoa drawing primitives. Your PDFGraphicsContext class seems to do most of that just fine, as well as it being pretty much the ONLY example on line of how to do this. Thanks for publishing this!)

Posted by Just on February 5, 2005 6:07 PM

I would be inclined to try making -focusStack return nil and making -setFocusStack a no-op. If that doesn't work, then it'd be worth printing the type of the object (i.e. NSLog (@"-setFocusStack: class %@, object %@", [(id)object class], object)) that gets passed in to -setFocusStack and see if you can work anything out from that.

Failing that, I think you'll need to ask Apple to help... but if you find out, please post the answer in a comment here so that others can benefit from your experience.

Posted by alastair Author Profile Page on February 7, 2005 9:50 AM

return nil or return NULL (since it's a void *) is working fine to work around this issue.

Posted by Stephane Sudre on December 27, 2006 6:14 PM

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