Women in Technology

Article:		The Cocoa Controller Layer
Subject:		Save and Loading the Array-Data
Date:		2004-04-12 05:55:02
From:		AlexKid
Thats a nice article of a great technologie. But could somebody show me the way to save the data colectet in the text view to a file and to load it again. I have some idees but I don t know realy how to do this. I hope somebody can show me a tuturial or an example program. Or tell me what i have to do. Thanx AlexKid

Showing messages 1 through 1 of 1.

• Save and Loading the Array-Data
  2004-04-15 05:51:49  kool [View]
  
  
  Scott Anguish just showed me how to do this:
  
  There are two ways to connect data to an NSArrayController.. by setting the content, or by binding the contentArray item to the object..
  
  I recommend keeping the array value (in your case, the contents of "MyContent" as a variable of the Document, and then bind the array controller to the File's Owner MyContent key.
  
  Anyways, that's partly moot in this case. loadDataRepresentation:ofType: is called before the nib is loaded. So the nib doesn't have an NSArrayController yet. You need to wait until the windowControllerDidLoadNib: is done.
  
  So, my fix would be
  
  add a "NSMutableArray *myContent" to your document class, and accessors for it.
  remove the connection to 'content' in IB
  bind the array controller's contentArray to that variable on File's Owner in the nib
  
  
- (NSData *)dataRepresentationOfType:(NSString *)aType
{
NSKeyedArchiver *archiver;
NSMutableData *data = [NSMutableData data];

archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
[archiver encodeObject:[self myContent] forKey:@"MyContent"];
[archiver finishEncoding];

return data;
[archiver release];
}

- (BOOL)loadDataRepresentation:(NSData *)data ofType:(NSString *)aType
{
NSMutableArray *mutArray;
NSKeyedUnarchiver *unarchiver;

unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
mutArray = [unarchiver decodeObjectForKey:@"MyContent"];

[self setMyContent:mutArray];

[unarchiver finishDecoding];
[unarchiver release];
return YES;
}