How to retrive data from document directory when application start?

Question

I have created application that record sound and display that sound file in tableview. In that application when sound is recorded than it's filepath will store in a array , which array i use to populate my tableview. But my problem is that when i close the application then my array will be empty , and i lost my recorded file.

So now how can i get my recorded file when i open my app second time. I am storing sound file in document directory.

Answer 1

Store array in NSUserDefaults. Retrive and Store the array in NSUserDefaults .. see the example of NSUserDefaults

In AppDelegate.h file just declare variable...

    NSUserDefaults  *userDefaults;
    NSMutableArray *yourArray;
    after...

In AppDelegate.m Fille in applicationDidFinishLonching: Method

    userDefaults = [NSUserDefaults standardUserDefaults];
    NSData *dataRepresentingtblArrayForSearch = [userDefaults objectForKey:@"yourArray"];
    if (dataRepresentingtblArrayForSearch != nil) {
        NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingtblArrayForSearch];
        if (oldSavedArray != nil)
            yourArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
        else
            yourArray = [[NSMutableArray alloc] init];
    } else {
        yourArray = [[NSMutableArray alloc] init];
    }
    [yourArray retain];

after that when you want to insert Data in this UserDefaults Use Bellow Code...

    [appDelegate.yourArray addObject:yourDataString];///set your value or anything which you want to store here...
    NSData *data=[NSKeyedArchiver archivedDataWithRootObject:appDelegate.yourArray];
    [appDelegate.userDefaults setObject:data forKey:@"yourArray"];
    [appDelegate.userDefaults synchronize];

i hope this help you...