Re: Building a C library Objective-C wrapper framework
Re: Building a C library Objective-C wrapper framework
- Subject: Re: Building a C library Objective-C wrapper framework
- From: Uli Kusterer <email@hidden>
- Date: Sat, 19 Jul 2008 18:12:29 +0200
On 15.07.2008, at 09:48, Sebastian Nowicki wrote:
I guess that didn't work. I forgot that categories only add to a
class, so I can't use the stuff from the category in the original
class. I also can't think of a way to use the typedef'd C structs
and enums from the library in the header file without including the
library header file. This is tricky indeed. If only I could see how
Apple did it with OpenGL, etc :P.
Well, for enums and things like that, I guess you'd have to directly
expose those. Maybe you can selectively include only their header?
Alternatively, you could define your own constants and translate
between those and the library's.
Instance variables are easy: You can declare a pointer to a struct
without needing to declare the struct itself, so put all your ivars
into a struct:
@interface MyClass : NSObject
{
struct MyClassPrivateIVars* ivars;
}
@end
And then declare the struct in a private header or in your
implementation file:
struct MyClassPrivateIVars
{
int var1;
int var2;
};
@implementation MyClass
-(id) init
{
if(( self = [super init] ))
{
ivars = calloc( 1, sizeof(struct MyClassPrivateIVars) );
// check ivars for success here.
ivars->var1 = 1;
ivars->var2 = 2;
}
return self;
}
-(int) var1
{
return ivars->var1;
}
-(void) setVar1: (int)n
{
ivars->var1 = n;
}
-(void) dealloc
{
// Clean up any object references or pointers in ivars here.
if( ivars )
free( ivars );
[super dealloc];
}
@end
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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