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I am trying to subclass General/NSData or General/NSMutableData.

#import <Cocoa/Cocoa.h>

@interface General/MyData : General/NSData {

int aValue; } @end

Everything compiles fine but when I allocate and initialize using

myData = General/[[MyData alloc] initWithContentsOfFile: myFilepath];

I get the following message

*** initialization method -initWithBytes:length:copy:freeWhenDone:bytesAreVM: cannot be sent to an abstract object of class General/MyData: Create a concrete instance!

It seems that the subclass is no a real instance. I can’t find any info subclassing General/NSData on the Apple site or any info on which methods must be overridden!

Any Ideas?

General/NSData is most likely a Class Cluster. Check out General/ClassClusters on what they are and how they work.

Michael Gyngell