And obviously, you also add - encodeWithCoder: and -initWithCoder: methods in your custom classes.
> Le 5 févr. 2016 à 14:33, Jean-Daniel Dupas <mail...@xenonium.com> a écrit : > > That is your need, not your problem. > > To archive an object graph (cyclic or not), you just do [NSKeyedArchiver > archiveRootObject:graph toFile:@"myfile"]; > > > >> Le 5 févr. 2016 à 14:28, Dave <d...@looktowindward.com> a écrit : >> >> Hi, >> >> See my other thread on this list which explains it fully - >> "Archive/Unarchive Problem/Question?”. >> >> Basically I need to save/restore a Network of Custom Objects….. >> >> All the Best >> Dave >> >>> On 5 Feb 2016, at 13:18, Jean-Daniel Dupas <mail...@xenonium.com> wrote: >>> >>> You don’t tell use what is your problem. You can perfectly encode any >>> structure using Keyed archivers (whether there is cycles and backlinks). >>> >>>> Le 5 févr. 2016 à 14:13, Dave <d...@looktowindward.com> a écrit : >>>> >>>> Hi, >>>> >>>> I’m having problems with Back Links when Archiving/Unarchiving an Object. >>>> I found the text below at: >>>> >>>> https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/Archiving/Articles/archives.html >>>> >>>> >>>> Root Object >>>> >>>> An object graph is not necessarily a simple tree structure. Two objects >>>> can contain references to each other, for example, creating a cycle. If a >>>> coder follows every link and blindly encodes each object it encounters, >>>> this circular reference will generate an infinite loop in the coder. Also, >>>> a single object can be referenced by several other objects. The coder must >>>> be able to recognize and handle multiple and circular references so that >>>> it does not encode more than one copy of each object, but still regenerate >>>> all the references when decoding. >>>> To solve this problem, NSCoder introduces the concept of a root object. >>>> The root object is the starting point of an object graph. To encode an >>>> object graph, you invoke the NSCoder method encodeRootObject:, passing in >>>> the first object to encode. Every object encoded within the context of >>>> this invocation is tracked. If the coder is asked to encode an object more >>>> than once, the coder encodes a reference to the first encoding instead of >>>> encoding the object again. >>>> >>>> NSCoder does not implement support for root objects; NSCoder’s >>>> implementation of encodeRootObject: simply encodes the object by invoking >>>> encodeObject:. It is the responsibility of its concrete subclasses to keep >>>> track of multiple references to objects, thus preserving the structure of >>>> any object graphs. >>>> >>>> The last paragraph seems pertinent to my problem, so do I need to do >>>> something special for “weak”, back links in order to “keep track of >>>> multiple references to objects”? If so could some please tell me how to do >>>> this? I’m really struggling to get something out the door and was advised >>>> to use the Keyed Archiver/Unarchiver as it would be the simplest >>>> implementation…… >>>> >>>> Is this any other documentation or sample code available? There are plenty >>>> of trivial examples out there, no nothing I can find that works for weak >>>> back links, although according to all the Apple Blurb I can find, it is >>>> possible, they just don’t tell you how to do it that I can find! >>>> >>>> Thanks in Advance for Any Help >>>> All the Best >>>> Dave >>>> >>>> _______________________________________________ >>>> >>>> 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: >>>> https://lists.apple.com/mailman/options/cocoa-dev/mailing%40xenonium.com >>>> >>>> This email sent to mail...@xenonium.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: >> https://lists.apple.com/mailman/options/cocoa-dev/mailing%40xenonium.com >> >> This email sent to mail...@xenonium.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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
