Save NSMutable dictionary data in plist file _ integers as key

Question

I'm currently trying to save a NSMutabledictionary keys and objects in a plist file. My keys are integers, so I'm using NSNumber to put them into the writeToFile function.

Even with that change, I cant find any of my saved data in the plist find. I suppose there is a problem with the NSNumber pointer because when I use a string it works.

do you have an idea of what is missing in my code?

    NSMutableDictionary *dictionnaireNoms = [[NSMutableDictionary alloc] initWithCapacity:40];
    NSNumber *nombre = [[NSNumber alloc] initWithInteger:dictionnaireNoms.count];        
    NSString *nomCommerce = text.text;
    [dictionnaireNoms setObject:nomCommerce forKey:nombre];

    //2. Sauvegarde du nom dans un fichier
    [saveDicoCommerce enregisterNom:dictionnaireNoms];


- (void)enregisterNom:(NSMutableDictionary*)nom
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSLog(@"%@", documentsDirectory);
    NSString *pathNom = [documentsDirectory stringByAppendingPathComponent:@"NomsDeCommerces.plist"];
    if (!documentsDirectory) {
        NSLog(@"Documents directory not found!");
        return;
    }
    [nom writeToFile:pathNom atomically:YES];
    if(![[NSFileManager defaultManager] fileExistsAtPath:pathNom])
    {
        NSLog(@"file not found");
        return;
    }

}

Answer 1

NSDictionary can only write itself directly if it only contains string keys. It confirms this you try to write using

[[NSPropertyListSerialization dataWithPropertyList:nom format:NSPropertyListBinaryFormat_v1_0 options:0 error:nil] writeToFile:pathNom atomically:NO];`

The output is:

Property list invalid for format: 200 (property list dictionaries may only have keys which are CFStrings, not 'CFNumber')

However, you can store NSDictionary objects containing NSNumber keys if you serialize it using NSCoding . Replace this:

[nom writeToFile:pathNom atomically:YES];

with:

[NSKeyedArchiver archiveRootObject:nom toFile:pathNom];

To read the file created, use:

NSDictionary *nom2 = [NSKeyedUnarchiver unarchiveObjectWithFile:pathNom];

For more information about archives, see the Archives and Serializations Programming Guide .

Answer 2

Why do u want to allocate NSNumber? Try this [your_dictionary setValue:[NSNumber numberWithInt:your_int]];