Pass variables from function to function

Question

I'm just learning Objective-C and have a what I'm sure is a pretty basic question here. This is a function I've created that will simple hold variables from some user input.

- (void)standardDatabaseWithName:(NSString*)name 
                            host:(NSString*)host 
                        username:(NSString*)username 
                        password:(NSString*)password
                        database:(NSString*)database
                            port:(NSInteger*)port {

  NSString *myName = name;
  NSString *myHost = host;
  NSString *myUsername = username;
  NSString *myPassword = password;
  NSString *myDatabase = database;
  NSInteger *myPort = port;
}

Below is a seperate function where I want to create a new var with that information and the from there use it was what I need.

- (void)insertStandardConnection {
    NSString name = [NewDbModalView standardDatabaseWithName:myName];
    NSString host = [NewDbModalView standardDatabaseWithName:myHost]; 
}

So this attempt didn't work for me. Any advice here guys? At this point I've been left scratching my head.

Aaron Saunders · Accepted Answer · 2010-11-01 17:38:52Z

2

I would suggest creating an object to hold all of that information and just pass the object around

answered Nov 1, 2010 at 17:38

Aaron Saunders

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Comments

Jeff Kelley · Accepted Answer · 2010-11-01 17:40:01Z

0

Every time you call the method, you have to provide all of the variables:

[NewDbModalView standardDatabaseWithName:myName host:myHost username:aUsername password:aPassword database:aDatabase port:aPort];

So, when you call [NewDbModalView standardDatabaseWithName:myName], that method doesn’t exist.

answered Nov 1, 2010 at 17:40

Jeff Kelley

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2 Comments

Shane Da Silva Over a year ago

Hey, thanks that makes sense. So the reason I was hoping my method would work is because I need to, at certain point, only target one of these var. So say I've done what you suggesting and only need to work with the username for example. How can I target that?

Jeff Kelley Over a year ago

You can create methods to do each of those. So if you only need to change the password, make a -setPassword: method.

Richard · Accepted Answer · 2010-11-01 17:47:47Z

0

The variables you declare in standardDatabaseWithName:... are local to that method. You need to store (copies of) that data inside the object. Although, looking at your code, I wonder if you're trying to set default values? In that case, you might want static global variables to take the values, and then you'd need -(void)standardDatabaseWithName:... to become +(void)setStandardDatabaseName:(NSString *)name ....

answered Nov 1, 2010 at 17:47

Richard

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Comments

Chris Lucian · Accepted Answer · 2010-11-01 18:53:37Z

0

In your .h file you should declare properties

    @interface standardDatabaseWithNameObject : NSObject{
    NSString *myName;
    NSString *myHost;
    NSString *myUsername ;
    NSString *myPassword;
    NSString *myDatabase;
    NSInteger *myPort;
    }

    @property (nonatomic, retain) NSString *myName;
    @property (nonatomic, retain) NSString *myHost;
    @property (nonatomic, retain) NSString *myUsername ;
    @property (nonatomic, retain) NSString *myPassword;
    @property (nonatomic, retain) NSString *myDatabase;
    @property (nonatomic, retain) NSInteger *myPort;
etc...

Then in your implementation you need to synthesize the properties and they will be available for use:

@synthesize myName, myHost, myUsername, myPassword, myDatabase, myPort;


- (void)standardDatabaseWithName:(NSString*)name 
                            host:(NSString*)host 
                        username:(NSString*)username 
                        password:(NSString*)password
                        database:(NSString*)database
                            port:(NSInteger*)port {

  myName = name;
  myHost = host;
  myUsername = username;
  myPassword = password;
  myDatabase = database;
  myPort = port;
}

- (void)insertStandardConnection {
    NSString name = myName;
    NSString host = myHost; 
}

- (void) dealloc
{
[myName release];
[myHost release];
[myUsername release];
[myPassword release];
[myDatabase release];
[myPort release];

}

Good Luck

edited Nov 1, 2010 at 18:53

answered Nov 1, 2010 at 17:58

Chris Lucian

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3 Comments

Shane Da Silva Over a year ago

Hey, thanks a lot. You've made that pretty crystal clear. So when passing that amount or info around. It's probably always cleaner to create a separate object, correct?

bbum Over a year ago

All of those need to be self.myName, etc, or the above code won't be following the retain/release rules...

Chris Lucian Over a year ago

Shane, depending on where you need the data, you should store it on that particular level. If you only need it within a function, then declare it in the function. If you need it in the object, then declare it as a property. If you need to globally, then declare it globally. -- Also bbum is right, you want to deallocate your variables at some point as to not create a memory leak.

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