Question

i have a stupid question…sometimes i see developers use the following code…

NSString *newURL = [_parameters objectForKey:@"url"];

when i use this i get error… here what is _parameters and how to declare it??

i can provide more example..

        NSLog(@"SaveImage Called");
        //google code for turning base64 into uiimage
   NSURL *url = [NSURL URLWithString:[self._parameters objectForKey:@"imageData"]];    
   NSData *imageData = [NSData dataWithContentsOfURL:url];
   UIImage *img = [UIImage imageWithData:imageData];   
   /*
   if(img != nil) {
      UIImageWriteToSavedPhotosAlbum(img, self, nil, nil);
   }
   */   

Answer 1

_parameters is a NSDictionary that seems to be defined previously in the code, e.g.

NSDictionary _parameters = [NSDictionary dictionaryWithObjects:@"foo", @"bar", nil
                                         forKeys:@"url", @"host", nil];

What exactly is your question? How is this related to JavaScript (edit: question was tagged as javascript)? You know that the language you use is Objective-C ?