This code is making the assumption that [reps objectAtIndex:0] is a bitmap image rep. NSImage makes no such guarantees. Points:
- Walk through all the image reps, looking for the best bitmap - If no bitmap exists, you'll have to create one by drawing the image into a bitmap context - If you're writing this fallback code, might as well make it your main code, and always draw into a bitmap context, rather than an NSImage rep On 29 Aug 2011, at 14:11, Martin Linklater wrote: > Thanks Marco. When I call representationUsingType I get this: > > -[NSCGImageSnapshotRep representationUsingType:properties:]: unrecognized > selector sent to instance 0x100220610 > 2011-08-29 14:08:16.161 TexLifter[69386:407] *** Terminating app due to > uncaught exception 'NSInvalidArgumentException', reason: > '-[NSCGImageSnapshotRep representationUsingType:properties:]: unrecognized > selector sent to instance 0x100220610' > > Here is my full code: > > NSSize outputImageSize; > outputImageSize.width = dimension; > outputImageSize.height = dimension; > self.outputImage = [[NSImage alloc] initWithSize:outputImageSize]; > > // Do a load of -[image drawAtPoint:fromRect:operation:fraction] calls > to composite > > NSArray* reps = self.outputImage.representations; > > NSBitmapImageRep* rep = [reps objectAtIndex:0]; > > NSData* data = [rep representationUsingType:NSPNGFileType > properties:nil]; > > *ERROR AS ABOVE* > > 8( > > On 29 Aug 2011, at 13:59, Marco Tabini wrote: > >> Hi Martin— >> >> On 2011-08-29, at 8:18 AM, Martin Linklater wrote: >> >>> Can anyone point me in the right direction as to how to save my NSImage to >>> a PNG file ? Or some documentation which actually describes how to convert >>> the NSCGImageSnapshotRep into something I can save out ? I've spent a few >>> hours on this now and I can't believe there isn't an easy solution I'm >>> missing. >> >> >> Take a look here: >> http://stackoverflow.com/questions/4438802/nscgimagesnapshotrep-how-get-bitmapdata >> >> HTH, >> >> >> —Mt. >> >> -- >> Phone: +1-416-630-6202 x.666 >> Twitter: @mtabini >> >> > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/cocoadev%40mikeabdullah.net > > This email sent to cocoa...@mikeabdullah.net _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
