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The title of this blog may take a little explaining.

I was looking to include a Carbon routine within my Cocoa application, but this routine needed to have access to both my instance variables and other Class methods. It is straight forward to use Cocoa commands in your Carbon routine, as long as they’re declared from within the routine itself. You have no access to the object reference “self”. This refers to the object in which your code resides.

In order to achieve this you first need to create an object of the Class method and an instance init method within your Class. Here I have a Class called AppController where my Carbon routine is located. I add the following code;

+ (AppController *) sharedController
{
    return sharedController;
}

- (id) init
{
    self = [super init];
    sharedController = self;

    // Any other initialiser code needed

    return self;
}

Now from within my Carbon routine a new AppController ojbect class is created called controller. I can now use this controller object in place of “self”. This gives me access to all my instance variables and methods.

void MyCarbonRoutine
{
    AppController *controller;
    controller = [[AppController alloc] init];
    [controller aCocoaRoutine];

    // Any other coding needed here

    [controller release];
}

Remember to release your controller object before leaving the Carbon routine or you could end up with all sort of problems.

- Thanks to Uli Kusterer for pointing out that they are Objects that are created and released and not the Classes themselves.

This entry was posted on Sunday, November 4th, 2007 at 8:46 pm and is filed under Apple, cocoa, infurious, programming. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.