Save NSmutableArray to file and load

Question

hello all , i am written app for my iphone and i want to save some NSmutablearray to file and load it later. i read about NSArchiver but didnt understand how to work with my calss is :

@interface Shop : NSObject 
{    
    NSString       *m_Name;
    NSString       *m_Description;
    NSString       *m_Category;
    NSString       *m_BestSaleDesc;
    NSString       *m_AdditionalInfo;   
    NSInteger       m_ShopId;
    NSInteger       m_ChainId;
    NSMutableArray *m_SalesList;
    NSData         *m_Icon;
    bool            m_Filtered;
    bool            m_Deleted;
    bool            m_Hidden;
}

can someone give me example code of how to save an NSmutableArray of calss Shop to file name ShopFile.sav and then how to load it again to NSmutableArray object.
thanks so much

Answer 1

Why not use Core Data? Core Data

Answer 2

NSArray *save = m_SalesList;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingString:@"/ShopFile.sav"];
[save writeToFile:filePath atomically:YES];

Should work. To load:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingString:@"/ShopFile.sav"];
NSArray *load = [NSArray arrayWithContentsOfFile:filePath];
m_SalesList = [NSMutableArray arrayWithArray:load];

This saves it to the documents directory in a file called "ShopFile.sav"

If you want to have your "Shop" NSObject in the array, simply use:

[m_SalesList addObject:(Shop class here)];