March 2010 - Cocoa-dev - lists.apple.com

Re: Creating thumbnail of PDF document first page?
by Warren Dodge 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com On Mar 31, 2010, at 3:43 PM, Laurent Daudelin wrote: > I'd like to open a PDF document and capture the first page in an NSImage. I've just did an overview of PDFKit but it doesn't seem there is any method/class I can use to do that easily. NSImage supports the first page of PDFs out of the box. Just create the NSImage as usual with -initWithContentsOfURL:, etc. Warren _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: Adding Rows to a Table View
by Matt Neuburg 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com Thread-index: AcrRKhcb2WXNcIy+IEa1neNVcL5TLQ== Thread-topic: Adding Rows to a Table View User-agent: Microsoft-Entourage/12.20.0.090605 On Wed, 31 Mar 2010 15:17:38 -0500, Fritz Anderson <fritza(a)manoverboard.org> said: >Fix this first; I'm surprised it doesn't crash your app almost immediately: > >On 31 Mar 2010, at 1:52 PM, Dave wrote: > >> myObjectNameString = [myDictionary objectForKey:[ParserXML parserObjectFieldName]]; >> myFactYearString = [myDictionary objectForKey:kField_FactYear]; >> myFactMonthString = [myDictionary objectForKey:kField_FactMonth]; >> myFactDayString = [myDictionary objectForKey:kField_FactDay]; >> myFactSourceDatabaseString = [myDictionary objectForKey:kField_FactSourceDatabase]; >> myFactTextString = [myDictionary objectForKey:kField_FactText]; >... >> [myObjectNameString release]; >> [myFactYearString release]; >> [myFactMonthString release]; >> [myFactDayString release]; >> [myFactSourceDatabaseString release]; >> [myFactTextString release]; And one other thought - you say you're gathering this data in a "secondary thread", so be sure to jump out to the main thread before calling something like insertRowsAtIndexPaths:withRowAnimation or reloadData. m. -- matt neuburg, phd = matt(a)tidbits.com, <http://www.tidbits.com/matt/> A fool + a tool + an autorelease pool = cool! AppleScript: the Definitive Guide - Second Edition! http://www.tidbits.com/matt/default.html#applescriptthings _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: Moving from nib to code with custom controller.
by Kevin Brock 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com On Mar 31, 2010, at 8:01 AM, James Cicenia wrote: > Hello - > > I have always used IB before. I added my controller and linked it all up and it worked great. > > Now, I have to move this instead to code. I am confused on how to do this. > > 1) I have a custom view controller. (FeaturedViewController) > 2) I have a UIScrollView (FeaturedScrollView) > 3) I normally linked it up with IB > scrollView = FeaturedViewController > delegate = FeaturedViewController > view = FeaturedViewController. > > SO.. How do I set this up in my init of my master Controller (HomePageController) Take a look at the ViewController sample, from Apple's web site. It sounds like you're asking for exactly what it's demoing. http://developer.apple.com/mac/library/samplecode/ViewController/ Kevin > > Thank you very much > James > > > > > > > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev(a)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/apple%40kevin.com > > This email sent to apple(a)kevin.com _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: -[NSOperationQueue cancelAllOperations] cleans queue, but not immediately?!
by Jerry Krinock 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com OK, I submitted some Document Feedback on -cancelAllOperations, referring to this thread in the list archives and complaining that the statement "Queued operations are cancelled before they begin executing" seems to be an oversimplification. And I was able to solve my deadlock with -waitUntilAllOperationsAreFinished by instead adding a key-value observer method for @"operations" and testing if its count == 0. This was my lucky day to have Mike Abdullah and Ken Thomases online when I had a threading issue. Thanks again!_______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: Creating thumbnail of PDF document first page?
by Martin Wierschin 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com ~Martin _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… I'd like to open a PDF document and capture the first page in an NSImage. If I remember correctly, if you init an NSImage with some PDF data/ file it will automatically draw just the first page. But I don't know if that's documented anywhere. This email sent to site_archiver(a)lists.apple.com

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Creating thumbnail of PDF document first page?
by Laurent Daudelin 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:content-type :content-transfer-encoding:subject:date:message-id:to:mime-version :x-mailer; bh=tMj9ZUU7ll7zyPcDQME4JUrUIPG5Sjx62QLo62RSb6w=; b=c81HO4jzSB8SXKPPN3q4CKZd81Aslq4ytxPhoVxXOGt4JMvjLbwTsScrJbRc1gcNqN FivGv+pKfK/JUaZ3YifMKlgtJrte21/x0+Mr+rtr8O1cQLzTrxhszeVCv30jo2qnlInW NvYwm8rk3GqePngjqmn4oV77LeBNg0VHUokvw= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:content-type:content-transfer-encoding:subject:date:message-id :to:mime-version:x-mailer; b=pLDXIQN4DkjXnaXw4jXur+gY+igk0xVtX/yuQqR1+tsy8fHz2zXG7L+cLdGYi0FrLf 1zY/dWoJ0DjlUoAFpJApZVzEVS0O5g2SoQp/lsvyyWZInAdmpRVWP5XyW8oX0cOrKIES 4t4QZ90Tw0Q0WJhUbvHNvt7uz6ZUy+wwzas6I= I'd like to open a PDF document and capture the first page in an NSImage. I've just did an overview of PDFKit but it doesn't seem there is any method/class I can use to do that easily. Anybody has any idea on how to do that? Similar to QuickLook but only for pdf and only the first page. Thanks in advance! -Laurent. -- Laurent Daudelin AIM/iChat/Skype:LaurentDaudelin http://nemesys.dyndns.org Logiciels Nemesys Software laurent.daudelin(a)gmail.com Photo Gallery Store: http://laurentdaudelin.shutterbugstorefront.com/g/galleries _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: -[NSOperationQueue cancelAllOperations] cleans queue, but not immediately?!
by Ken Thomases 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com On Mar 31, 2010, at 5:03 PM, Jerry Krinock wrote: > So Ken I believe you're saying that the "cancelled" operations become ready to run immediately, which they do (as no-ops), which removes them from the queue. In *effect* therefore, "are cancelled before they begin executing" *does indeed* == "removed from queue". Yes, with the caveat that it can take some time. An arbitrary amount. > But maybe this is not true in 10.5? On 10.5, -cancel does not make the receiver ready. So, it still has to wait to become ready in the normal way. If you haven't overridden what readiness means, then the operation just has to wait for all of its dependencies to finish. You can remove the dependencies at the same time you cancel the operations, if you like, but there's no one-method way to do that. Cheers, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: -[NSOperationQueue cancelAllOperations] cleans queue, but not immediately?!
by Jerry Krinock 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com On 2010 Mar 31, at 15:03, Jerry Krinock wrote: > So Ken I believe you're saying that the "cancelled" operations become ready to run immediately, which they do (as no-ops), which removes them from the queue. In *effect* therefore, "are cancelled before they begin executing" *does indeed* == "removed from queue". > > But maybe this is not true in 10.5? I thought about this some more and I think I get it now. You're telling me that the methods will run ... eventually ... subject to the usual constraints, which are a bit more in 10.5. So, the answer is that "are cancelled before they begin executing" == "removed from queue *eventually*" _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: -[NSOperationQueue cancelAllOperations] cleans queue, but not immediately?!
by Jerry Krinock 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: cocoa-dev(a)lists.apple.com On 2010 Mar 31, at 14:39, Mike Abdullah wrote: > [self cancelAllOperations]; > [self waitUntilAllOperationsAreFinished]; > > Cancelling the operations is asynchronous since an in-progress op may take a little while to finish up. OK, but does -cancelAllOperations ultimately remove all operations from the queue? From documentation: "This method sends a cancel message to all operations currently in the queue. Queued operations are cancelled before they begin executing." Does "are cancelled before they begin executing" == "removed from queue"? Maybe Ken explains this... On 2010 Mar 31, at 14:43, Ken Thomases wrote: > All that -cancel does is mark the operations as canceled. Then, it is up to the operation to check the isCancelled property and finish as soon as possible. The default implementation of -start (for non-concurrent operations) does this before even getting started. > > As of Snow Leopard, -cancel also makes the operation ready, regardless of any unfinished dependencies it may have. So, the queue is free to start any canceled operations. However, the queue obeys its usual constraints. If it has a maximum number of concurrent operations and it is already executing that many, it will have to wait to start the ones you just canceled. Even if it doesn't have a hard maximum, the kernel may not assign it a free worker thread if load is high. Etc. So Ken I believe you're saying that the "cancelled" operations become ready to run immediately, which they do (as no-ops), which removes them from the queue. In *effect* therefore, "are cancelled before they begin executing" *does indeed* == "removed from queue". But maybe this is not true in 10.5? >> in the class documentation it says "It is safe to use a single NSOperationQueue object from multiple threads without creating additional locks to synchronize access to that object." >> > That's an explicit guarantee that NSOperationQueue is totally thread-safe. Yes, I thought it looked pretty good. >> I tried running the above code with performSelectorOnMainThread wrappers, but got a deadlock I can't explain either. (Sample shows mach_msg_trap.) >> > You can look at the stack traces a bit further down. I suspect you have multiple inter-dependent things both trying to perform a selector on the main thread and blocking for the result. Duh. Turns out that the method in which the code was executing was itself an operation running on the main thread. Thanks for the help with this! _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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Re: Runtime check if C function exists
by Ken Thomases 31 Mar '10

31 Mar '10

site_archiver(a)lists.apple.com Delivered-To: Cocoa-dev(a)lists.apple.com On Mar 31, 2010, at 4:50 PM, Philip Mobley wrote: > I am wanting to perform a runtime check to see if a particular C function exists. While in this particular case, the C function I want to use is only available as part of 10.6 SDK (there are examples of this in archives), but I want to know if there is a runtime method similar to @selector that would work on C generic methods. Just check the function address (its name without an argument list) against NULL. There are examples in Apple's cross-development documentation. http://developer.apple.com/mac/library/documentation/DeveloperTools/Concept… Cheers, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev(a)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/site_archiver%40lists.appl… This email sent to site_archiver(a)lists.apple.com

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