ARC and forward declaration error

Scripting Forums AppleScriptObjC and Xcode
#1

Hi All,
Getting back to my ASOC project now and switching over to ARC for OS 10.8

I have a timer class

@class backupCAppDelegate;
@class backup;

@interface SHTimer : NSObject {

	IBOutlet backupCAppDelegate *bDelegate;
	IBOutlet backup *bBackup;
}

and am seeing this error when trying to access my applescript class. Worked before under GC.

BOOL isVolume =  [[bBackup checkIfDiskExists:destString];

compile error: receiver type 'backup' for instance message is forward declaration

I connected the outlet bBackup between the backup applescript instance (blue cube) and the timer blue cube.It’s been a while and I am a bit befuddled with the old communications between the two classes.

Thanks, Rob

#2

You have unbalanced square brackets there…

#3

Yes I just miscopied the method.In the code it is:

BOOL isVolume =  [bBackup checkIfDiskExists:destString];

I did some more searching though and came across an old post of Shane’s and tried it.

[NSClassFromString(@“backup”) checkIfDiskExists:destString];

It compiles. I will see if it works in the field. So we don’t even need to use the blue cube instance and can access the class directly?

Rob

#4

As long as you don’t need the class to have any properties, yes.

#5

Oh right… so to access properties we go with alloc() init() and make an instance? Or the blue cube instance…

Thanks Shane. Starting to make sense again.

Rob

#6

Right.