Re: Newbie question on saving data
Re: Newbie question on saving data
- Subject: Re: Newbie question on saving data
- From: "John C. Randolph" <email@hidden>
- Date: Tue, 9 Nov 2004 18:59:45 -0800
On Nov 8, 2004, at 6:07 PM, Steve Gran wrote:
>You can generate XML data using NSPropertyListSerialization:
>
>NSPropertyListSerialization
>http://developer.apple.com/documentation/Cocoa/Reference/Foundation/
>ObjC_classic/Classes/NSPropertyListSerialztion.html
>
>Use NSPropertyListXMLFormat_v1_0 as the format.
Wow, now I'm really confused. I guess that's what I get for being a
newbie trying to learn programming.
:)
So do I use this method within the
dataRepresentationOfType:(NSString *)aType method?
No, the -dataRepresentationOfType: and -loadDataRepresentationOfType:
are for the simple case, where you don't want to bother with file I/O,
but know how to get your info in and out of a plain old byte buffer.
If you want to go one level lower, and have to deal with the file in
question directly, you would not implement -dataRepresentationOfType:,
but rather -writeToFile:ofType: and -readFromFile:ofType:.
Assuming that "myArray" contains a set of strings, dates, etc, a
typical implementation of -writeToFile:ofType: might be:
- (BOOL)writeToFile:(NSString *)fileName ofType:(NSString *)docType
{
id myPlist = [myArray propertyList]; // gets a text description of
myArray
return [myPlist writeToFile:fileName atomically:YES]; // this will
return YES if successful.
}
-jcr
John C. Randolph <email@hidden> (408) 974-8819
Sr. Cocoa Software Engineer,
Apple Worldwide Developer Relations
http://developer.apple.com/cocoa/index.html
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