dict walk and lockFocus

TOC | PREV | NEXT

Problem: You need code to iterate over each element of a dictionary.
Solution: Clone this:

- (void)investigateDictionary:(NSMutableDictionary *)dictionary
{
      NSEnumerator *state = [dictionary keyEnumerator];
      NSString *key;

      NSLog(@"KEY\tVALUE\n");


      while(key = [state nextObject]) {
       NSLog(@"%@\t%@\n",key,[dictionary objectForKey:key]);
       // work with each dictionary member here
      }
}
      Also - gdb's "print-object" is extremely useful for looking at your objects.

Problem: NSImage's lockFocus doesn't return anything so this code is bum:

      if ([image lockFocus]) {
       [image unlockFocus];
      }

Solution: Use NSImage's "-(BOOL)isValid" method in conjunction:

      if ([image isValid]) {
       [image lockFocus];
       [image unlockFocus];
      }

TOC | PREV | NEXT
Created by Stone Design's Create on 6/2/1997