hi all, i have read the memory rules a few times now, so does this sound right?
1) after i append an item i have created to a menu i have created, and i don't want to own the menu item any more, i should release the item so that the menu owns it 2) when i add a submenu i have created to a menu i have created, and i don't want to own the submenu any more, i should release the submenu so that the menu owns it 3) when i set the menus i have created for NSApp using setMainMenu then... what? who owns them? how do i set more menus for NSApp? how do i get NSApp to release the current set? thanks, bill On Tue, Apr 27, 2010 at 7:12 AM, Graham Cox <graham....@bigpond.com> wrote: > Bill, you need to learn about the concept of object ownership within Cocoa. > Ownership is the model for memory management, retain count merely an > implementation detail which can tell you nothing useful. > > Menus own their submenus, so if you delete a menu with submenus, you don't > need to also delete those submenus yourself. Chances are you are > over-releasing them so when the parent menu is deleted, the submenu is no > longer there and hence you get a crash. > > You simply can't work with Cocoa without having a good solid understanding > of memory management and particularly the concept of ownership. It's > different from Carbon and different from C++ and so on. Your subject title > is apt - using retain counts in an attempt to debug faulty memory management > is the path to madness. > > > http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/MemoryMgmt/Articles/mmRules.html > > --Graham > > > > > On 27/04/2010, at 11:46 PM, Bill Appleton wrote: > > > hi all, > > > > i like to create some menus, set them as the main menu bar, then maybe > > delete them, and create some more menus, use them, etc. > > > > but i can't find any way to do this with cocoa > > > > here is the problem > > > > when you add a submenu (setSubMenu:forItem) the retain count on the > submenu > > goes up by one > > > > but when you delete that item, or set its submenu to nil, the retain > count > > does not change > > > > if you ever delete a menu that has a submenu you will get a crash, but > there > > is no way to unassociate the menu and the submenu > > > > another problem: when you set the main menu bar [NSApp > setMainMenu:themenu] > > the retain count on themenu goes up by a lot, i can't predict it, but > maybe > > 4 or 5 > > > > if you set the main menu bar to nil the retain count does not change on > the > > original main menu > > > > so given all this, i can't find a way to create and delete menus without > > crashes or memory leaks > > > > am i doing something wrong? > > > > > > > > thanks > > > > bill appleton > > _______________________________________________ > > > > 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/graham.cox%40bigpond.com > > > > This email sent to graham....@bigpond.com > > _______________________________________________ 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
