Re: Syntax error in header file

28: - (KCLine *)getLineWithColor:(KCColor *)color

29: {

30: if(linesByColor == nil)

31: linesByColor = [[[NSMutableDictionary alloc] init] autorelease];

32:

33: KCLine *line = [linesByColor objectForKey:color];

34: if(line == nil)

35: {

36: line = [[KCLine alloc] init];

37: [linesByColor setObject:line forKey:color];

38: NSLog(@"Creating %@ line\n", color);

39: }

40: return line;

41: }

/Users/ryan/Downloads/QuartzLines/KCLineFactory.m:36: warning: receiver 'KCLine' is a forward class and corresponding @interface may not exist

Users/ryan/Downloads/QuartzLines/KCLineFactory.m:37: warning: 'NSDictionary' may not respond to '-setObject:forKey:'

I've lookup up the "forward class..." error and it seems this is caused by @class KCLine; Does anyone ever use the old C trick for Obj-C header files ?

#ifndef _STDIO_H_

#define _STDIO_H_

/* contents of stdio.h */

#endif

Suggestions?

On Sat, Apr 26, 2008 at 10:33 AM, Ryan Chapman <email@hidden> wrote:

Thanks alot everyone! @class worked. KCLineFactory.h ended up looking like:

#import <Cocoa/Cocoa.h>

@class KCLine;

@class KCColor;

@interface KCLineFactory : NSObject

{

NSDictionary *linesByColor;

}

+ (KCLineFactory *)sharedKCLineFactory;

- (KCLine *)getLineWithColor:(KCColor *)color;

@end

On Sat, Apr 26, 2008 at 8:05 AM, Jean-Claude Turcq <email@hidden> wrote:

usually when you implemented your own objects like :

@interface MyOwnObject
{
MyOwnSecondObject *lpSO;

}

@end

you need to tell the compiler that MyOwnSecondObject is a class you implemented yourself with the following line before the interface:
@class MyOwnSecondObject; //to specify you implements elsewhere

@interface MyOwnObject
{
MyOwnSecondObject *lpSO;
}

@end

so in your example, why not trying declare before your interface :

@class KCLine;
@class KCLineFactory;
@class KCColor;

what's the result ???

Le 26 avr. 08 à 00:56, Ryan Chapman a écrit :

I'm sure this is simple, but I'm new to Obj-C, so I can't figure it out.

I've modified the QuartzLines Cocoa project to test drawing lines as flyweights. I've created a singleton factory called KCLineFactory that stores an NSMutableDictionary of KCLine objects

I'm getting the following compiler error:
/Users/ryan/Downloads/QuartzLines/KCLineFactory.h:20: error: syntax error before 'KCLine'

and here is KCLineFactory.h:
1: //
2: // LineFactory.h
3: // QuartzLines

4: //
5: // Created by Ryan on 4/24/08.
6: // Copyright 2008 Initech, Inc.. All rights reserved.

7: //
8:
9: #import <Cocoa/Cocoa.h>
10: #import "KCLine.h"
11: #import "KCColor.h"

12:
13: @interface KCLineFactory : NSObject

14: {
15: NSDictionary *linesByColor;

16: }
17:
18: + (KCLineFactory *)sharedKCLineFactory;
19:
20: - (KCLine *)getLineWithColor:(KCColor *)color;
21:
22: @end

KCLine and KCColor are objects defined in KCLine.m and KCColor.m

Where is the syntax error?

Thanks

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References:
	>Syntax error in header file (From: "Ryan Chapman" <email@hidden>)
	>Re: Syntax error in header file (From: Jean-Claude Turcq <email@hidden>)
	>Re: Syntax error in header file (From: "Ryan Chapman" <email@hidden>)