Question

Can you find a bug in this line of code? It returns nil!!
The app is completely sandboxed but Downloads folder access is enabled.

NSArray*array = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] error:NULL];
        //array==nil: Why?

[EDIT] Problem: I cannot test it. It is happening on a Guest account of the review machines. Could there be something wrong with the complied binary or have you got any tips how to solve this issue?

Answer 1

Try to read the directory with an error handle to examine what happens:

NSError *error = nil;
NSArray*array = [[NSFileManager defaultManager] 
                  contentsOfDirectoryAtPath:
                   [NSHomeDirectory() stringByAppendingPathComponent:@"/Downloads/"] 
                                      error:&error];
if ( !array ) 
     NSLog(@"ERROR: %@", [error description]);

That will give you a more detailed description what went wrong.

To log this error to a file quick’n’dirty use the following message:

[[error description] writeToFile:@"strangeerrors.log" 
  atomically:NO encoding:NSUTF8StringEncoding error:nil];