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POmemory leak in xamarin in app purchase
 

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  1. POmemory leak in xamarin in app purchase
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    <p>So I have been trying to setup in app purchase within my application and encountered a problem which I don't know how to solve. Im working with xamarin, and I followed their <a href="http://docs.xamarin.com/guides/ios/application_fundamentals/in-app_purchasing/part_3_-_purchasing_consumable_products" rel="nofollow">In app purchase guide</a> on how to buy consumables products.</p> <p>Everything was going great until I tried to get the transaction receipt returned by apple. Everytime I access this property from the SKPaymentTransaction object (anywhere in my project), I get this error which according to some people is a memory leak. This just happens whenever I access this property (SKPaymentTransaction.TransactionReceipt).</p> <p>The error:</p> <pre><code>*** error: can't allocate region *** set a breakpoint in malloc_error_break to debug </code></pre> <p>My code looks a lot like the one found on the guide I previously told you about. First of all I created a in app purchase manager which is the one in charge of making requests to apple in order to obtain product information (this works great), and update my UI whenever a transaction is succeeded or failed:</p> <pre><code>public class InAppPurchaseManager : SKProductsRequestDelegate { IMobileServiceTable receiptTable = AppDelegate.MobileService.GetTable("Receipt"); public InAppPurchaseManager () { SKPaymentQueue.DefaultQueue.AddTransactionObserver (new TransactionObserver(this)); } public void RequestProductData (List&lt;NSString&gt; productIds) { var array = new NSString[productIds.Count]; for (var i = 0; i &lt; productIds.Count; i++) { array[i] = productIds[i]; } NSSet productIdentifiers = NSSet.MakeNSObjectSet&lt;NSString&gt;(array); var productsRequest = new SKProductsRequest(productIdentifiers); productsRequest.Delegate = this; // for SKProductsRequestDelegate.ReceivedResponse productsRequest.Start(); } public override void ReceivedResponse (SKProductsRequest request, SKProductsResponse response) { SKProduct[] products = response.Products; NSDictionary userInfo = null; if (products.Length &gt; 0) { NSObject[] productIdsArray = new NSObject[response.Products.Length]; NSObject[] productsArray = new NSObject[response.Products.Length]; for (int i = 0; i &lt; response.Products.Length; i++) { productIdsArray[i] = new NSString(response.Products[i].ProductIdentifier); productsArray[i] = response.Products[i]; } userInfo = NSDictionary.FromObjectsAndKeys (productsArray, productIdsArray); } NSNotificationCenter.DefaultCenter.PostNotificationName ("InAppPurchaseManagerProductsFetchedNotification", this, userInfo); } public override void RequestFailed (SKRequest request, NSError error) { Console.WriteLine (" ** InAppPurchaseManager RequestFailed() " + error.LocalizedDescription); } public void PuchaseProduct (SKProduct product) { SKPayment payment = SKPayment.PaymentWithProduct (product); SKPaymentQueue.DefaultQueue.AddPayment (payment); } public void CompleteTransaction (SKPaymentTransaction transaction) { var productId = transaction.Payment.ProductIdentifier; // Register the purchase, so it is remembered for next time FinishTransaction(transaction, true); } public void FinishTransaction(SKPaymentTransaction transaction, bool wasSuccessful) { // remove the transaction from the payment queue. SKPaymentQueue.DefaultQueue.FinishTransaction(transaction); using (var pool = new NSAutoreleasePool()) { NSDictionary userInfo = NSDictionary.FromObjectsAndKeys(new NSObject[] {transaction},new NSObject[] {new NSString("transaction")}); if (wasSuccessful) { NSNotificationCenter.DefaultCenter.PostNotificationName (new NSString("InAppPurchaseManagerTransactionSuccedeedNotification"), this, userInfo); } else { // send out a notification for the failed transaction NSNotificationCenter.DefaultCenter.PostNotificationName (new NSString("InAppPurchaseManagerTransacionFailedNotification"), this, userInfo); } } } public void FailedTransaction (SKPaymentTransaction transaction) { if (transaction.Error.Code == 2) // user cancelled Console.WriteLine("User CANCELLED FailedTransaction Code=" + transaction.Error.Code + " " + transaction.Error.LocalizedDescription); else // error! Console.WriteLine("FailedTransaction Code=" + transaction.Error.Code + " " + transaction.Error.LocalizedDescription); FinishTransaction(transaction,false); } }} </code></pre> <p>On the method FinishTransaction I would like to insert the returned receipt in my server (before insert, of course verify it against apple servers) if the transaction was successful. So at this point I need to access SKPaymentTransaction.TransactionReceipt, encode this receipt to base64, and send it to my server. This just does not work and I dont know why.</p> <p>My transaction observer:</p> <pre><code>public class TransactionObserver : SKPaymentTransactionObserver { private InAppPurchaseManager iap; public TransactionObserver (InAppPurchaseManager manager) : base() { iap = manager; } public override void UpdatedTransactions (SKPaymentQueue queue, SKPaymentTransaction[] transactions) { foreach (SKPaymentTransaction transaction in transactions) { switch (transaction.TransactionState) { case SKPaymentTransactionState.Purchased: iap.CompleteTransaction (transaction); break; case SKPaymentTransactionState.Failed: iap.FailedTransaction(transaction); break; default: break; } } } } </code></pre> <p>So, another info I can give you is that my project compiles, and when it tries to deploy the app to my device, it crashes.</p> <p>Also, I am on the xamarin beta channel since I am already using async and await.</p> <p>So please if you see anything wrong let me know. </p> <p><strong>UPDATE</strong></p> <p>Everytime i clean the project it works, and stops giving that error!!! I dont know why this is behaving like this!</p>
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    1. COI see some methods that are marked as `async`, but they don't seem to `await` anything (such as `FinishTransaction`). Do you see some warning messages about that? (I don't think this will fix your issue, though)
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      1. USjonathanpeppers
    2. COyes, thats because I was previously making a request to windows azure mobile services. But you're tight it doesn't fix this issue. @jonathanpeppers
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      1. USDaniel
 

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