cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   arsenio
   Member

   Hi guys!

   I am using CCCallFunc well with this syntax:

   id action1 = [CCCallFunc actionWithTarget:self selector:@selector(displayPigpens)];

   which is fine for methods which do not take arguments. However, I have a method I must pass an INT to and I am having so much trouble figuring out how to do it. I have tried different things which don't seem to work such as:

   id action2 = [CCCallFuncND actionWithTarget:self selector:@selector(updatePigStack:data:) data:(int *)-pigAmount];
   or
   id action2 = [CCCallFuncND actionWithTarget:self selector:@selector(updatePigStack:data:) data:-pigAmount];

   for the record, my method declaration looks like this:

   -(void)updatePigStack:(int)pigAmount {

   How do I do this, any ideas?

   Posted 1 year ago #
2. 

   Webtopia
   Member

   Try this

   id action2 = [CCCallFuncND actionWithTarget:self selector:@selector(updatePigStack:data:) data:pigAmount],

   - (void) updatePigStack:(id)sender data:(int)pigAmount {

   Magical coding stuff here.....

   }

   I think you need the (id)sender

   Posted 1 year ago #
3. 

   arsenio
   Member

   That seems to do it, thank you kind sir!!

   Posted 1 year ago #
4. 

   2cute4u
   Member

   Webtopia's solution works with 1 parameter. I need to pass 4 int parameters. The selector is:

   -(void) animateSpell:(int)spellType  Strength:(int)strength  Species:(int)species Distance:(int)distance;

   Any suggestions

   Posted 1 year ago #
5. 

   kai
   Member

   Hey all,

   I am using CCCallFuncND pretty often. However its the first time that I wanted to pass a integer like Arsenio originally asked. The above seems to work, however I am getting a warning when I build the code:

   warning: passing argument 3 of 'actionWithTarget:selector:data:' makes pointer from integer without a cast"

   Here is the code I have used:

   int Edata = [[NSString stringWithFormat:@"%i%i", enemyNo, enemyChoosen] intValue];
   id actionMove4 = [CCCallFuncND actionWithTarget:self selector:@selector(ERestore:data:) data:Edata];
   
   &
   
   -(void) ERestore:(id)sender data:(int)intVar1 {
   ... }

   What is the right way to do it? And I would be indeed be interested to know how to pass two arguments, like 2cute4u was asking ;-)

   KR KAI

   Posted 1 year ago #
6. 

   AcesWild
   Member

   There are a few ways this can be accomplished, but here is what I would suggest...
   Create some object that represents all the data you need for this callback, lets call it "ERestoreData" which is based on your method name (obviously).
   

   @interface ERestoreData : NSObject
   {
      int m_dataItem1;
      int m_dataItem2;
      NSString* m_someString;
      //blah blah blah
   }

   Then when you set up your action, you pass it one of these guys as your data parameter, then, in your callback.

   -(void) ERestore:(id)sender data:(void*)callbackData
   {
      ERestoreData* data = (ERestoreData*) callbackData;
      //Do your work using the data you packed into your ERestoreData instance.
   }

   This should then also make it very easy for you in the future if/when you decided you need more info passed into your callback.

   Posted 1 year ago #
7. 

   kai
   Member

   Sounds great and flexible. Thanks for the advise AcesWild.

   KR Kai

   Posted 1 year ago #
8. 

   AcesWild
   Member

   You're welcome. I hope it works out for you!

   Posted 1 year ago #
9. 

   kai
   Member

   Just make the thread round, here the way how I implemented the solution:

   Add the following class:
   

   //
   //  dataobjects.h
   //
   
   #import <Foundation/Foundation.h>
   
   @interface dataobjects : NSObject {
   
   	int edataItem1;
   	int edataItem2;
   
   }
   
   @property NSInteger edataItem1;
   @property NSInteger edataItem2;
   
   @end

   //
   //  dataobjects.m
   //
   
   #import "dataobjects.h"
   
   @implementation dataobjects
   
   @synthesize edataItem1;
   @synthesize edataItem2;
   
   @end

   And thats how I make use of it:

   //
   // actual class for making use of the method
   //
   ...
   #import "dataobjects.h"
   ...
   // Prepare variables to pass data
   dataobjects *EData = [[dataobjects alloc] init];
   EData.edataItem1 = enemyNo;
   EData.edataItem2 = enemyChoosen;
   //
   id action = [CCCallFuncND actionWithTarget:self selector:@selector(ERestore:data:) data:EData];
   [target runAction:[CCSequence actions:..., ...., action, nil]];
   ...
   ...
   -(void) ERestore:(id)sender data:(void*)callbackData {
   
   	dataobjects *EData = callbackData;
   	ETrack[EData.edataItem1][EData.edataItem2][0] = -100;
   	ETrack[EData.edataItem1][EData.edataItem2][1] = -100;
   	ETrack[EData.edataItem1][EData.edataItem2][2] = 1;
   }
   ...

   Posted 1 year ago #
10. 

    2cute4u
    Member

    Thanks this is working for me.

    But it seems to me that there should be a way to do this with less overhead, creating a data object, just to pass parameters seems expensive to me.

    Posted 1 year ago #
11. 

    tjcarr70
    Member

    Just derive from CCSprite and create a few properties that way you can cast back from the id to the appropriate instance.

    example base class

    @interface Ship : CCSprite {
    int _nScore;
    int _nHealth;
    BOOL _visible;
    BOOL _canFire;
    }

    @property (assign) int _score;
    @property (assign) int _nHealth;
    @property (assign) BOOL _visible;
    @property (assign) BOOL _canFire;

    @end

    -(void) myFunc:(id)sender {
    /// where ship is your base class
    Ship* sprite = (Ship*)sender;
    }

    This way code is cleaner.

    Regards

    Tim

    Posted 1 year ago #
12. 

    geoegroeg
    Member

    Couldn't you format all arguments in a string that you send to CCCallFuncND ?
    I mean something like this:
    NSString *values = [NSString stringWithFormat:@"%d/%d/%d",value1,value2,value3];
    then send this string to CCCallFuncND.
    And parse your string in the called method using [NSString pathComponents];

    Didn't need this so far, but this is how I would do it.

    Posted 8 months ago #
13. 

    Appicus
    Member

    The simplest way to passing an argument is to work with own objects. Create a Class which contains all variables (or other objects) and pass it as data argument:

    MyClass *object1 = [[MyClass alloc] init];
    // Initialize here all values you need for object, as example:
    object1.position = CGPointMake(160,240);
    // Then call the 'selector1'
    [ self runAction:[CCSequence actions:
                      // You can create here some more actions,
                      [CCCallFuncND actionWithTarget:self selector:@selector(selector1:data:) data:object1],
                      nil] ];

    Your selector1 should be something like this:
    

    - (void)selector1:(id)sender data:(MyClass *)object {
      // Do here something with object
    }

    Regards,
    - Kenan.

    Posted 8 months ago #
14. 

    robseward
    Member

    @Appicus and @kai, won't your code cause a memory leak? How do you dealloc the data object?

    Posted 6 months ago #
15. 

    Appicus
    Member

    Yeah, robseward you're right.... don't forget to dealloc the data object :)

    Posted 6 months ago #

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