how to create and allocate a C buffer as part of an objective C class

Question

best to explain with an example:

in my AudioItem.h

#define ITEM_CAPACITY 100

typedef struct DataStruct {
    void *                          conten         


        

Answer 1

it fails because data is a null pointer when you set its content.

the easy way to do this is:

enum { ITEM_CAPACITY = 100 };

typedef struct DataStruct {
    char content[ITEM_CAPACITY];
    UInt32 size;
} DataStruct;

@interface AudioItem : NSObject
{        
@private
    DataStruct data;
}

@implementation AudioItem
- (id)initWithID:(NSString *)itemID
{
    self = [super init];
    if (0 == self) return;
    data.size = ITEM_CAPACITY;
    return self;
}