Windows Store Native IAP Plugin (until IL2CPP is supported in Unity IAP)

All i know about c++ is it looks confusing (and i don't want to cause anything crazy to happen)
i know a bit about c# because of working with unity (worst thing i could do there is an infinite loop)

been looking at the c++ examples for Windows Store IAP
and i'm trying to bridge the functions i need to do a simple consumable purchase

Code (CSharp):

1.  
2. extern "C" {
3.    bool ConfigStore() {
4.      ConfigureSimulatorAsync("in-app-purchase-consumables.xml");
5.    }
6.    bool Buy() {
7.      create_task(CurrentAppSimulator::RequestProductPurchaseAsync("product1"))
8.        .then([](task<PurchaseResults^> currentTask) {
9.        try
10.        {
11.          PurchaseResults^ results = currentTask.get();
12.          switch (results->Status)
13.          {
14.          case ProductPurchaseStatus::Succeeded:
15.            return Fulfill("product1", results->TransactionId);
16.            break;
17.          default:
18.            return false;
19.            break;
20.          }
21.        }
22.        catch (Platform::Exception^ exception)
23.        {
24.          return false;
25.        }
26.      });
27.    }
28.    
29. }
30. bool Fulfill(Platform::String^ productId, Platform::Guid transactionId)
31. {
32.    create_task(CurrentAppSimulator::ReportConsumableFulfillmentAsync(productId, transactionId))
33.      .then([](task<FulfillmentResult> currentTask)
34.    {
35.      try
36.      {
37.        FulfillmentResult result = currentTask.get();
38.        switch (result)
39.        {
40.        case FulfillmentResult::Succeeded:
41.          return true;
42.          break;
43.        default:
44.          return false;
45.          break;
46.        }
47.      }
48.      catch (Platform::Exception^ exception)
49.      {
50.        return false;
51.      }
52.    });
53. }
54.  

 

If you're trying to make a native plugin... I thought that was possible in VS using C# for some reason...

Anyway, I do know a little C++, (Enough to make a rudimentary game engine, in fact) but I'm no John Carmack here. I guess I could have a look at the API and lend some help when I get time. (I'm still working on my submission! )

 

yes, but Windows Store IL2CPP managed plugins aren't supported yet, unless that's changed

Thanks , yea i'm still working on mine too
hoping i can possibly get a unity pro license to offset my costs

 

@Aurimas Cernius Definitely more comfortable with c# (can't believe i've been using unity for almost 2 years now)

Thank you that makes a lot of sense

 

CX? Never heard of it...

 

Sounds like C++ and C# had a baby... for Microsoft. Sounds interesting.

 

ok how do i return back the information from a concurrency task in a static function

Code (CSharp):

1. DLLExport bool __stdcall Buy() {
2.         create_task(Windows::ApplicationModel::Store::CurrentAppSimulator::RequestProductPurchaseAsync("product1"))
3.             .then([](task<PurchaseResults^> currentTask) {
4.             try {
5.                 PurchaseResults^ results = currentTask.get();
6.                 switch (results->Status)
7.                 {
8.                 case ProductPurchaseStatus::Succeeded:
9.                     return Fulfill("product1", results->TransactionId);
10.                     break;
11.                 default:
12.                     return false;
13.                     break;
14.                 }
15.             }
16.             catch (Platform::Exception^ exception) { return false; }
17.         });
18.         //return inner result ?;
19.     }

 

If you wanted, you should be able to wrap your C# IAP code in a DLL, then use the DLL from Unity.
http://docs.unity3d.com/Manual/windowsstore-plugins-il2cpp.html

As for how to return back information, I usually announce IAP results through a callback or event. In other words, I'd make public void Buy(Action<bool> resultCallback) instead of public bool Buy().

This callback or event doesn't get run right away though, I usually queue it up and run it on the Unity thread, since I normally have things in game that need to act on the results of the IAP.
http://docs.unity3d.com/ScriptReference/WSA.Application.InvokeOnAppThread.html (Haven't used this, found out about it after I made my own implementation.)

 

@Garth Smith Thank you for the info

haven't really seen any callbacks in the scripts i've learn t from so..
the concept seems very useful for ui tho, i'm used to every thing going through my update methods

? so are you saying there's a way for me to completely avoid c++ and get Unity IAP to work with windows store IL2CPP ?

 

I haven't done it for IL2CPP, but the documentation seems to say you can P/Invoke into a native DLL that you compile outside of Unity.

The documentation then shows an example with a DLL compiled with C. Not sure what you would need to P/Invoke into a C# plugin. I'm used to using managed plugins, so I'm not sure what would go in place of [MarshalAs(UnmanagedType.LPWSTR)]...
http://docs.unity3d.com/Manual/windowsstore-plugins-il2cpp.html

 

i'm so lost...

Code (CSharp):

1. UnityEngine.WSA.Application.InvokeOnUIThread(ConfigStore, false);

breaking on Concurrency, ppltasks.h

Code (CSharp):

1. if (_M_exceptionObserved == 0)
2.             {
3.                 // If you are trapped here, it means an exception thrown in task chain didn't get handled.
4.                 // Please add task-based continuation to handle all exceptions coming from tasks.
5.                 // this->_M_stackTrace keeps the creation callstack of the task generates this exception.
6.                 _REPORT_PPLTASK_UNOBSERVED_EXCEPTION();
7.             }

think i'm just going to spend this time working on my game mechanics, or maybe add some sound, havent done that yet

 

Thank you, yes i've set up a callback for buy, but i'm not invoking these methods right
or
theres really is a problem with my ConfigStore method

Code (CSharp):

1. Concurrency::task<void> ConfigureSimulatorAsync(Platform::String ^ filename) {
2.         return Concurrency::create_task(Windows::ApplicationModel::Package::Current->InstalledLocation->GetFileAsync("data\\" + filename))
3.             .then([](Windows::Storage::StorageFile^ proxyFile)
4.         {
5.             return Windows::ApplicationModel::Store::CurrentAppSimulator::ReloadSimulatorAsync(proxyFile);
6.         });
7.     }
8.     DLLExport void __stdcall ConfigStore() {
9.         ConfigureSimulatorAsync("in-app-purchase-consumables.xml");
10.     }

 

i'm just configuring the simulator so that i can then attempt a simulated purchase
the buy button isn't set to run after ConfigureSimulatorAsync(); is called

havent got through getting the ConfigureSimulatorAsync() to complete whatever it does
without breaking on a exception

 

i see right so turn this Concurrency::task<void> to void , and don't return anything

Thank You!

 

ok now i need to know how to stop my static reference to the callback from being cleaned up before the purchase is done

// Marshaling cleanup of parameter '___cb' native representation

Code (CSharp):

1. typedef void(__stdcall *CallMeLater)(int);
2. static CallMeLater cb;
3.  
4. extern "C"  {
5. DLLExport void Buy(CallMeLater callback) {
6.         cb = callback;
7.         if (!cb) { return; }
8.         create_task(Windows::ApplicationModel::Store::CurrentAppSimulator::RequestProductPurchaseAsync("product1"))
9.             .then([](task<PurchaseResults^> currentTask) {
10.             try {
11.                 PurchaseResults^ results = currentTask.get();
12.                 switch (results->Status)
13.                 {
14.                 case ProductPurchaseStatus::Succeeded:
15.                     cb(1); //return Fulfill("product1", results->TransactionId);
16.                     break;
17.                 default:
18.                     cb(0);
19.                     break;
20.                 }
21.             }
22.             catch (Platform::Exception^ exception) { cb(0); }
23.         });
24.     }
25. }

 

Code (CSharp):

1. public delegate void CallMeLater(int result);
2.   [DllImport("SimpleStore.dll")] static extern void ConfigStore();
3.   [DllImport("SimpleStore.dll")] static extern void Buy(CallMeLater cb);
4.   [DllImport("SimpleStore.dll")] static extern void Test(CallMeLater cb);
5.  
6.   void OnGUI() {
7.     if(GUI.Button(new Rect(100, 300, 200, 80), "Test")) {
8.       Button.Test(Button.Tester);
9.     }
10.     if(GUI.Button(new Rect(100, 100, 200, 80), "ConfigStore")) {
11.       UnityEngine.WSA.Application.InvokeOnUIThread(Button.ConfigStore, false);
12.       Debug.LogError("StoreConfigured");
13.     }
14.     if(GUI.Button(new Rect(300, 100, 200, 80), "Buy")) {
15.       UnityEngine.WSA.Application.InvokeOnUIThread(() => Button.Buy(ProcessPurchase), false);
16.       Debug.LogError("Buy?");
17.     }
18.   }
19.   [AOT.MonoPInvokeCallback(typeof(CallMeLater))]
20.   public static void ProcessPurchase(int result) {
21.     if(result == 1) { Debug.LogError("purchase success"); }
22.     else { Debug.LogError("purchase fail"); }
23.   }
24.   [AOT.MonoPInvokeCallback(typeof(CallMeLater))]
25.   public static void Tester(int result) {
26.     Debug.LogError("Callback Worked: " + result);
27.   }

breaking on

Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention.

 

Code (CSharp):

1. // System.Void Button::Buy(Button/CallMeLater)
2. extern "C"  void Button_Buy_m4233563334 (Object_t * __this /* static, unused */, CallMeLater_t2468943012 * ___cb, const MethodInfo* method)
3. {
4.     typedef void (DEFAULT_CALL *PInvokeFunc) (methodPointerType);
5.     static PInvokeFunc _il2cpp_pinvoke_func;
6.     if (!_il2cpp_pinvoke_func)
7.     {
8.         int parameterSize = sizeof(void*);
9.         _il2cpp_pinvoke_func = il2cpp_codegen_resolve_pinvoke<PInvokeFunc>("SimpleStore.dll", "Buy", IL2CPP_CALL_DEFAULT, CHARSET_UNICODE, parameterSize, false);
10.  
11.         if (_il2cpp_pinvoke_func == NULL)
12.         {
13.             IL2CPP_RAISE_MANAGED_EXCEPTION(il2cpp_codegen_get_not_supported_exception("Unable to find method for p/invoke: 'Buy'"));
14.         }
15.     }
16.  
17.     // Marshaling of parameter '___cb' to native representation
18.     methodPointerType ____cb_marshaled = { 0 };
19.     ____cb_marshaled = il2cpp_codegen_marshal_delegate(reinterpret_cast<Il2CppCodeGenMulticastDelegate*>(___cb));
20.  
21.     // Native function invocation
22.     _il2cpp_pinvoke_func(____cb_marshaled);
23.  
24.     // Marshaling cleanup of parameter '___cb' native representation
25.  
26. }

yellow arrow for break points to the end this function }

 

YAY!!!
Thank You @Tautvydas Zilys and @Aurimas Cernius

 

Code (CSharp):

1.  
2. FulfillmentResult result
3. PurchaseResults^ results

whats with ^ on PurchaseResults^ and not on FulfillmentResult ?

and is it safe for me to returns these to unity with a callback ?

 

Thank you @Tautvydas Zilys I've learned so much from you

i'll just cast the ints to enums for status on the c# side,
Platform::Guid =?= System.Guid for transaction id and
Platform::String^ =?= System.String for product id

 

will try all of this after sleep, cheers

 

do i have to clean up the stuff i create in these c++ methods?

right now i'm trying to transfer the transaction id to and from the c++ side using a unsigned char* == byte[]
wondering why i can't do this:

Code (CSharp):

1. unsigned char last = { b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15] };

going from Platform::String to unsigned char* , how?
going from unsigned char* to Platform::String ?

 

ok ended up turning the transactionId into a unsigned char* and using Marshal.Copy(System.IntPtr, byte[] dest, 0, 16);
don't have to send the transactionId back to c# side but i would like to record fulfilled items with transactionIds
currently i'm getting a nullptr break
going to try this GCHandle thing to get a pointer on the c# side instead of the c++ side, should i put my Free() call in OnDisable() ?

and for now i'll just hard code the product string + index


----
really awesome that you can access the same byte[] on both sides with out copying it over and over

 

Thank you, next time i will definitely use that to get a string back from the c++ side,

do you know why these pointers aren't used for stuff like setting vertex mesh data and setting matrix[] on shader material properties?
i guess in theory the IL2CPP convector could just handle all that automatically ?

 

using GCHandle.Alloc and then AddrOfPinnedObject to get an IntPtr

how do i call Data on Platform::String^ ?

 

awesome

i keep forgetting this ^ thingy ...
Thanks again @Tautvydas Zilys

 

do i need to do anything after sending the callback the string?

Code (CSharp):

1.  
2. typedef void(__stdcall *VoidCallbackString)(const wchar_t*);
3.  
4. VoidCallbackString StringResult;
5.  
6. StringResult(e->ToString()->Data());
7.  
8. [AOT.MonoPInvokeCallback(typeof(VoidCallbackString))]
9.     static void StringResult([MarshalAs(UnmanagedType.LPWStr)] string arg) {
10.  
11. }

 

sorry, its just for sending error messages on so i can log them
(trying to integrate advertising for windows store)
i'm just very unfamiliar with c++ and i don't want to cause any memory leaks

 

Code (CSharp):

1.  
2. typedef void(__stdcall *VoidCallbackString)(const wchar_t*);
3. VoidCallbackString StringResult;
4.  
5. void Ads::Item::OnErrorOccurred(Platform::Object ^ sender, Microsoft::Advertising::WinRT::UI::AdErrorEventArgs ^ e)
6.     {
7.         StringResult(e->ToString()->Data()); // does this get cleaned up automatically after this method ends
8.     }
9.  
10. string logLater;
11. [AOT.MonoPInvokeCallback(typeof(VoidCallbackString))]
12. static void StringResult([MarshalAs(UnmanagedType.LPWStr)] string arg) {
13.    logLater = arg;
14. }
15.  

i'm wondering if the string needs to be cleaned up after using this connection between c++ and c#

 

Thank you @Tautvydas-Zilys

 

Is that in-line C++ in a C# script? I don't think that's it, but...

 

hey @FuzzyQuills, c++ is so weird to look at after starting with c#; definitely wouldn't want it in-line with my c# code

yea i just pasted the related code snippets together here

 

Ah I see, lol. XD
To me, C# is glorified Java, C++ is low-level hardcore Java.
That did look a bit odd though seeing them together... XD

@Tautvydas-Zilys So you're telling me (Or him, I just happened to read it) that data returned through such a callback doesn't leak? Interesting. Anyway, apologise if it's getting off-topic, haven't really touched C++ in a while...