memory leak in xamarin in app purchase - ios

Question

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 In app purchase guide on how to buy consumables products.
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).
The error:
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
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:
public class InAppPurchaseManager : SKProductsRequestDelegate
{
IMobileServiceTable receiptTable = AppDelegate.MobileService.GetTable("Receipt");
public InAppPurchaseManager ()
{
SKPaymentQueue.DefaultQueue.AddTransactionObserver (new TransactionObserver(this));
}
public void RequestProductData (List<NSString> productIds)
{
var array = new NSString[productIds.Count];
for (var i = 0; i < productIds.Count; i++) {
array[i] = productIds[i];
}
NSSet productIdentifiers = NSSet.MakeNSObjectSet<NSString>(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 > 0) {
NSObject[] productIdsArray = new NSObject[response.Products.Length];
NSObject[] productsArray = new NSObject[response.Products.Length];
for (int i = 0; i < 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);
}
}}
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.
My transaction observer:
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;
}
}
}
}
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.
Also, I am on the xamarin beta channel since I am already using async and await.
So please if you see anything wrong let me know.
UPDATE
Everytime i clean the project it works, and stops giving that error!!! I dont know why this is behaving like this!

Answer 1

This is a known bug.
There is also a workaround in the bug report: add "-f" to the additional mtouch arguments in the project's iOS Build options page.