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Documentation from the AppleDeveloperConnection:

See FoundationCollections for a general overview; see DesignDictionary for a critique of the dictionary design in general.


Here’s a little example I threw together to use NSDictionary with some strings. It’s not particularly good, but it might help you understand a little better.

#import <Cocoa/Cocoa.h>

int main(int argc, const char *argv[]) { NSDictionary *dict; NSEnumerator *enumerator; id key; NSAutoreleasePool * pool = NSAutoreleasePool alloc] init];

dict = [NSDictionary dictionaryWithObjectsAndKeys: @”A beverage prepared by heating cocoa with water/milk”, @”cocoa”, @””, @”cocoadev”, @”4 : a list (as of items of data or words) stored in a
computer for reference (as for information retrieval
or word processing)”, @”dictionary”, nil];

// printf(“entry for cocoa: %s\n\n”, // [[dict objectForKey:@”cocoa”]cString]); // Use of the cString method is discouraged ASCII is out Unicode is in. // Also watch out for [[dict objectForKey:@”cocoa”]cString] notice the // lack of a space between the receiver and the message. // And lastly since this is a Cocoa example why not use an [[NSLog() NSLog(@”entry for cocoa: %@”, [dict objectForKey:@”cocoa”]);

enumerator = [dict keyEnumerator];

while ((key = [enumerator nextObject])) { //printf(“%s : %s\n”, [key cString], // dict objectForKey: key] cString]); NSLog(@”%@ : %@”, key, [dict objectForKey:key]); }

[pool release];

return 0;//[[NSApplicationMain(argc, argv); }

I switched the order of “dictionary” and its definition. It looked like it was in key-object order instead of object key. – GKinnel