XCode Cocoa/Objective-C Saving program data

[ledd]

I am relatively new to Objective-C and Cocoa and have built an application in which I want to be able to save the current data. (AS in File - Save As - countDown.cd or somthing)
After the save you could then Open the saved file and it would restore the app with the appropriate data etc...

What is the best way of doing this?
I know I can obviously make a text file with the stored data in key pairs and then parse on an open but is there a better/more standard approach.

Thanks.

[HiRez]

What is the best way of doing this?
I know I can obviously make a text file with the stored data in key pairs and then parse on an open but is there a better/more standard approach. You probably want to look at NSArchiver, NSCoder, and related classes. This document (http://developer.apple.com/documentation/Cocoa/Conceptual/Archiving/Archiving.html) has a lot more info on it.

[kainjow]

You probably want to look at NSArchiver, NSCoder, and related classes. This document (http://developer.apple.com/documentation/Cocoa/Conceptual/Archiving/Archiving.html) has a lot more info on it.

If you're going to go down this route, use NSKeyedArchiver since it is better for backwards compatibility for future versions of your app.

[ledd]

Thanks a bunch. I will check it out.

[ledd]

Ok so I checked it out and I thought I got it to work but I have a problem.

Does anyone have an idea why this doesn't update my NSDatePicker when I load the saved file?

- (NSData *)dataRepresentationOfType:(NSString *)aType
{
NSDate* date = [datePicker dateValue];
return [NSKeyedArchiver archivedDataWithRootObject: date];
}

- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)aType
{
NSLog(@"About to read data of type %@", aType);
NSDate* date;
date = [NSKeyedUnarchiver unarchiveObjectWithData:data];
if(date == nil){
NSLog(@"Test");
return NO;
}
else{
[datePicker setDateValue: date];
return YES;
}
return YES;
}