CODEWITHSUNDEEP
c#iosxamarin.iosxamarin
Lobbe
Lobbe

Reputation: 71

Store password on device

I've got a button, where you can create a new password by entering and reentering it.
When both are the same the password should be stored somewhere on the phone for further use.

For the moment i can ignore password safety.

How is the simplest way to store and read the password on the device?

btnLogin.TouchUpInside += delegate {
    if(password.Exists /*My Isolated storage or password file*/){
        ReturnToView();
} else{
    new UIAlertView("Password doesn't exists", "Create a new password, to log in", null, "Ok").Show();
}

};

I've tried something like this, but I don't know how to check if the password exists in the .TXTfile.

void CreateUser(){    
IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();
    StreamWriter Writer = new StreamWriter(new IsolatedStorageFileStream("Password.txt", FileMode.OpenOrCreate, fileStorage));

    btnCreateUser.TouchUpInside += delegate {
       if(txtPassword.Text == txtRepeat.Text && txtPassword.Text.Length == 4){
           GoBackToView(); //Login
           Writer.WriteLine(txtPassword.Text);
           Writer.Close();
      } //here comes my else function, but that's not important.
    };
}

After this, a password should be created in a .TXT. In a new method called Login() I'll do this.

IsolatedStorageFile fileStorage = IsolatedStorageFile.GetUserStoreForApplication();
StreamReader Reader = null;
try 
    {
    Reader = new StreamReader(new IsolatedStorageFileStream("Password.txt", FileMode.Open, fileStorage));
    Reader.Close();
    }
catch
    {
    MessageBox.Show("File it not created");
    }

Somewhere in my login method, I want to check if the password is created when I've entered a password, and when I press my login button.

Upvotes: 0

Views: 397

Answers (2)

Cheesebaron
Cheesebaron

Reputation: 24460

The answer @manujmv posted can be translated to:

void StoreLoginCredentials(string password)
{
    var userDetails = NSUserDefaults.StandardUserDefaults;
    userDetails.SetString(password, "password");
    userDetails.Synchronize();
}

bool CheckUserSession()
{
    var userDetails = NSUserDefaults.StandardUserDefaults;
    return userDetails["password"] != null;
}

bool DestroyLoginCredentials()
{
    var defaults = NSUserDefaults.StandardUserDefaults;
    defaults.RemovePersistentDomain(NSBundle.MainBundle.BundleIdentifier);
    return defaults.Synchronize();
}

string PasswordOfUser()
{
    var userDetails = NSUserDefaults.StandardUserDefaults;
    return userDetails["password"];
}

Upvotes: 1

manujmv
manujmv

Reputation: 6445

You can store the password in NSUserDefaults. Just create the below method and pass the password to this method.

-(void)storeLoginCredentials:(NSString*)password    {

    userDetails = [NSUserDefaults standardUserDefaults];
    [userDetails setObject:password forKey:@"password"];

    [userDetails synchronize];

}

Then if you want to check whether the user is logged in or not you can use the below method:

-(BOOL)checkUserSession {

    if ([userDetails objectForKey:@"password"]!= nil ) {
        return YES;
    } else {
        return NO;
    }

}

If you want to logged out the user, use below method.

-(void)destroyLoginCredentials  {

    NSString *appDomain = [[NSBundle mainBundle] bundleIdentifier];
    [[NSUserDefaults standardUserDefaults] removePersistentDomainForName:appDomain];
}

You can take the password as

-(NSString *)passwordOfUser {

    return  [userDetails objectForKey:@"password"];
}

Upvotes: 2

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