Question

I am fairly new to objective c and cocoa, however i have spent a lot of time with c++, and I have never run across this issue before.

My application needs to identify a mounted disk by name. Here is the code:

//this code will run whenever a new disk is mounted to the computer
-(void) scanForKindle:(NSNotification *) notification 
{
    NSMutableArray *mountedDisks = [[NSMutableArray alloc] init];
    mountedDisks = [workspace mountedRemovableMedia];
    NSMutableArray *ebookDevices = [[NSMutableArray alloc] init];
    NSDictionary *fileAttributes = [[NSDictionary alloc] init];

    int currentDisk;

    for (currentDisk = 0; currentDisk < [mountedDisks count]; currentDisk++)
    {
        NSLog(@"Name: %@", [mountedDisks objectAtIndex:currentDisk]);

        if ([mountedDisks objectAtIndex:currentDisk] == @"/Volumes/Kindle")
        {
            NSLog(@"Kindle has been identified");
        }
    }
} 

I have gotten everything to work perfectly up to the if statement in the for loop. It simply wont run. any ideas why? I am sure this is a simple fix, but I cannot figure this out for the life of me.

Any help would be greatly appreciated!

Answer 1

That’s because you are making pointer comparison between two different instances of NSStrings.

Do this instead –

if ([[mountedDisks objectAtIndex:currentDisk] isEqualToString:@"/Volumes/Kindle"])
{
    NSLog(@"Kindle has been identified");
}