UE4 C++ How to pass Result data

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adevill20 asked Jan 25, '17

UE4 C++ How to pass Result data

Hey guys.

I'm looking for some help plz. I'm trying to use the Result data from any of the OnSuccess delegates, however I can't seem to get the result passed into another variable for later use.

eg.

//in MyProject.H
void OnLoginSuccess(const PlayFab::ClientModels::FLoginResult& Result) const;

UPROPERTY(Category = "MyProject|PlayFab|Client", BlueprintReadWrite)
FString PlayFabSession;


//In MyProject.CPP
void UNFGameInstance::OnLoginSuccess(const PlayFab::ClientModels::FLoginResult& Result) const
{
	UE_LOG(NF, Log, TEXT("PlayFab : Login Successfull for : %s"), *Result.PlayFabId);
	PlayFabSession = Result.SessionTicket;
}

I'm using the SessionTicket as an example here. How can I get the "Result.SessionTicket" value into the PlayFabSession variable ?

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Answer 1 · 2017-01-25T20:44:12Z

brendan answered Jan 25, '17

We actually do exactly that in our own SDK. Have a look at how we set the mUserSessionTicket in the OnLogin... calls in our Client SDK code: https://github.com/PlayFab/UnrealCppSdk/blob/4ee4360042cf9d1f4f4f19641fa1128e7bfed7df/ExampleProject/Plugins/PlayFab/Source/PlayFab/Private/Core/PlayFabClientAPI.cpp. Specifically, it's the DecodeRequest code you'll want to review, here: https://github.com/PlayFab/UnrealCppSdk/blob/28476bf7e8c28ae0012827e468a1bfbc3e984e05/ExampleProject/Plugins/PlayFab/Source/PlayFab/Private/Core/PlayFabResultHandler.cpp.

5

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adevill20 commented · Jan 26, 2017 at 07:12 AM

Thanks for the info. I have the problem where the compiler tells me that I cannot set a Fstring = const Fstring.

I see in your internal API the methods are not defined as const, but in the example code (see below) they are all defined as const. Would you be able to give a small example of what I need to do/how to define them ?

//Internal
voidUPlayFabClientAPI::OnLoginWithAndroidDeviceIDResult(FHttpRequestPtrHttpRequest,FHttpResponsePtrHttpResponse,bool bSucceeded,FLoginWithAndroidDeviceIDDelegateSuccessDelegate,FPlayFabErrorDelegateErrorDelegate)
{
1. ClientModels::FLoginResult outResult;
2. FPlayFabError errorResult;
3. if(PlayFabRequestHandler::DecodeRequest(HttpRequest,HttpResponse, bSucceeded, outResult, errorResult))
4. {
  1. if(outResult.SessionTicket.Len()>0)
    1. { mUserSessionTicket = outResult.SessionTicket;
//Example
voidPlayFabApiTest_LoginWithEmail::OnError(constPlayFab::FPlayFabError&ErrorResult)const
{
1. if(ErrorResult.ErrorMessage.Find(TEXT("password"))==-1)// Check that we correctly received a notice about invalid password
2. { UE_LOG(LogPlayFab, Error, TEXT("Non-password error with login"));
3. }
4. }

0 ·

adevill20 commented · Jan 26, 2017 at 08:46 AM

I did some reading on const functions/methods and now understand the reason this doesn't work. Would I then just define my variable as mutable (see code below) ? I know these are probably basic questions.

mutable FString PlayFabSession;

0 ·

adevill20 commented · Jan 26, 2017 at 04:59 PM

Ok found that "mutable" works 100%, for those stuggeling like me.

0 ·

brendan adevill20 commented · Jan 26, 2017 at 07:19 PM

Using mutable does indeed let you assign data to the variable in question from a const function. Making a function const (putting that keywords after the closing parenthesis of the args list) is a "safety" thing, basically saying "make sure no non-static data can be changed" - which includes calling non-static functions. So depending on your own code needs, you could set your variable to be mutable, or you could remove the const specifier for the function. It's really down to how you want to manage the code for your own title.

1 ·

adevill20 brendan commented · Jan 26, 2017 at 07:28 PM

Great, thank you very much for the help.

0 ·

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UE4 C++ How to pass Result data

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