Objective-C Error Handling

NSString *domain = @"com.MyCompany.MyApplication.ErrorDomain";
NSString *desc = NSLocalizedString(@"Unable to complete the process", @"");
NSDictionary *userInfo = @{ NSLocalizedDescriptionKey : desc };
NSError *error = [NSError errorWithDomain:domain code:-101 userInfo:userInfo];

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject

-(NSString *) getEmployeeNameForID:(int) id withError:(NSError **)errorPtr;

@end

@implementation SampleClass

-(NSString *) getEmployeeNameForID:(int) id withError:(NSError **)errorPtr{
    if(id == 1)
    {
       return @"Employee Test Name";
    }
    else
    {
       NSString *domain = @"com.MyCompany.MyApplication.ErrorDomain";
       NSString *desc =@"Unable to complete the process";
       NSDictionary *userInfo = [[NSDictionary alloc]
       initWithObjectsAndKeys:desc,
       @"NSLocalizedDescriptionKey",NULL];
       *errorPtr = [NSError errorWithDomain:domain code:-101
       userInfo:userInfo];
       return @"";
    }
}

@end


int main()
{
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   SampleClass *sampleClass = [[SampleClass alloc]init];
   NSError *error = nil;
   NSString *name1 = [sampleClass getEmployeeNameForID:1 withError:&error];

   if(error)
   {
      NSLog(@"Error finding Name1: %@",error);
   }
   else
   {
      NSLog(@"Name1: %@",name1);
   }

   error = nil;

   NSString *name2 = [sampleClass getEmployeeNameForID:2 withError:&error];

   if(error)
   {
      NSLog(@"Error finding Name2: %@",error);
   }
   else
   {
      NSLog(@"Name2: %@",name2);
   }

   [pool drain];
   return 0;

}

2013-09-14 18:01:00.809 demo[27632] Name1: Employee Test Name
2013-09-14 18:01:00.809 demo[27632] Error finding Name2: Unable to complete the proces