I am grappling with adding an NSData object to a NSMutable array. The code is executing fine but it is not adding the objects in the array.The code is as follows:

NSData * imageData = UIImageJPEGRepresentation(img, 1.0);

int i=0;

    do{

        if([[tempArray objectAtIndex:i] isEqual:imageData])
        {
            [tempArray removeObjectAtIndex:i];
        }
        else 
        {
            [tempArray addObject:imageData];
            //NSLog(@"ANURAG %@",[tempArray objectAtIndex:0]);
        }
    }while(i<[tempArray count]) ;

The NSLog statement shows the object added is null however the value of imageData is not null.

I have defined the tempArray as a static memeber of the class in which this code is written.

Is it because of the size of the data object as it is the data of an image????