gistfile1.m

/* Native binding */

extern "C" {
    void _requestProducts(
            char** sProductIdentifiers,     uint32_t rp_len,
            ManagedRequestCallback callback) {
        
        NSMutableSet* productIdentifiers = [[NSMutableSet alloc] initWithCapacity:20];
        for (int i=0; i<rp_len; i++) {
            [productIdentifiers addObject:GetStringParam(sProductIdentifiers[i])];
        }
        SKProductsRequest* productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:productIdentifiers];
        
        DMCTIAPStoreKitDelegate* delegate = [DMCTIAPStoreKitDelegate sharedInstance];
        delegate.callback = callback;
        productsRequest.delegate = delegate;
        [productsRequest start];
    }
}



/* DMCTIAPStoreKitDelegate */ 

typedef void (*ManagedRequestCallback)
(   bool success,               sk_product products[],
uint32_t nProducts,         char* invalidProducts[],
uint32_t nInvalidProducts                               );


@interface DMCTIAPStoreKitDelegate : NSObject <SKProductsRequestDelegate, SKPaymentTransactionObserver>
@property (nonatomic) ManagedRequestCallback callback;
@end

@implementation
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {
. . . . 
    _callback(true, _products, retProductsLength, _invalidProducts, retInvalidProductsLength);
. . . . 
}
@end