Le 6 févr. 2010 à 17:55, Michael Ash a écrit : > 2010/2/6 Frédéric Testuz <ftes...@bluewin.ch>: >> Hi all, >> >> I'm beginning a new application targeting Snow Leopard only. So I want to >> use the new tools (blocks) and garbage collection (GC). It will be my first >> application using GC. >> >> I read some sites on GC and blocks. In the blog of Mike Ash I found some >> very interesting propositions. My question concerns his code for using block >> with sheets >> (http://www.mikeash.com/?page=pyblog/friday-qa-2009-08-14-practical-blocks.html). >> Is this code works in GC ? >> >> @implementation NSApplication (SheetAdditions) >> >> - (void)beginSheet: (NSWindow *)sheet modalForWindow:(NSWindow *)docWindow >> didEndBlock: (void (^)(NSInteger returnCode))block >> { >> >> [self beginSheet: sheet >> modalForWindow: docWindow >> modalDelegate: self >> didEndSelector: @selector(my_blockSheetDidEnd:returnCode:contextInfo:) >> contextInfo: [block copy]]; >> } >> >> - (void)my_blockSheetDidEnd: (NSWindow *)sheet returnCode: >> (NSInteger)returnCode contextInfo: (void *)contextInfo >> { >> void (^block)(NSInteger returnCode) = contextInfo; >> block(returnCode); >> [block release]; >> } >> >> @end >> >> I think, I have to replace [block copy] by CFRetain([block copy]) >> and [block release] by CFRelease(block). > > I believe your GC modifications are correct. As you've presumably > determined already, [block copy] alone isn't enough to keep the block > alive through the void *. > > If you happen to be writing dual-mode code, you can write code that > works in both GC and refcounted environments by writing > CFRetain([block copy]) in the first part and CFRelease(block); [block > release]; in the second.
Thanks for your answer and for the completion. It will make the code reusable for another case without GC. Frédéric_______________________________________________ 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
