Linker Error with PlayFab

Development Programming & Scripting
1

I’ve been trying to follow the tutorials on playfab to integrate UnrealBlueprintSDK. I can compile the code fine, but when I want to call the blueprintcallable methods in my C++ code, I get linker errors.

In my header, I include this:

#include "GameFramework/GameMode.h"
#include "PlayFabClientModels.h"
#include "PlayFabClientAPI.h"

/**
 * 
 */
UCLASS()
class ITEMS_API AItemsGameMode : public AGameMode
{
	GENERATED_BODY()

public:
	AItemsGameMode ();

	virtual void BeginPlay() override;
}

and in my source file, I make the call to PlayFab’s loginwithcustomid method, as shown in the guide I linked above:

void AItemsGameMode::BeginPlay()
{
	//Override this if you want more logic before starting the game
	StartGame();

	Super::BeginPlay();

	// Create Request
	FClientLoginWithCustomIDRequest request;
	request.CustomId = "GettingStartedGuide";
	request.CreateAccount = true;
	request.InfoRequestParameters = nullptr;
	// Set up Callbacks
	UPlayFabClientAPI::FDelegateOnSuccessLoginWithCustomID onSuccess; onSuccess.BindUFunction(this, "OnLoginOrRegister");
	UPlayFabClientAPI::FDelegateOnFailurePlayFabError onError; onError.BindUFunction(this, "OnSharedError");
	// Make API Call
	UPlayFabClientAPI* callObj = UPlayFabClientAPI::LoginWithCustomID(request, onSuccess, onError, nullptr);
	// Extra activation step for UE BP
	callObj->Activate();
}

However, I still get linker errors:

ItemsGameMode.cpp.obj : error LNK2019: unresolved external symbol "public: static class UPlayFabClientAPI * __cdecl UPlayFabClientAPI::LoginWithCustomID(struct FClientLoginWithCustomIDRequest,class UPlayFabClientAPI::FDelegateOnSuccessLoginWithCustomID,class UPlayFabClientAPI::FDelegateOnFailurePlayFabError,class UObject *)" (?LoginWithCustomID@UPlayFabClientAPI@@SAPEAV1@UFClientLoginWithCustomIDRequest@@VFDelegateOnSuccessLoginWithCustomID@1@VFDelegateOnFailurePlayFabError@1@PEAVUObject@@@Z) referenced in function "public: virtual void __cdecl AItemsGameMode::BeginPlay(void)" (?BeginPlay@AItemsGameMode@@UEAAXXZ)
2>D:\p4w\Unreal\TestGame\Binaries\Win64\UE4Editor-TestGame-Win64-DebugGame.dll : fatal error LNK1120: 1 unresolved externals

I also added “PlayFab” to my PublicDependencyModuleNames list in my build.cs file as well.

The method that is throwing the linker error is nothing out of ordinary. It resides in PlayFabClientAPI.h

// callbacks
    DECLARE_DYNAMIC_DELEGATE_TwoParams(FDelegateOnSuccessLoginWithCustomID, FClientLoginResult, result, UObject*, customData);

    /** Signs the user in using a custom unique identifier generated by the title, returning a session identifier that can subsequently be used for API calls which require an authenticated user */
    UFUNCTION(BlueprintCallable, Category = "PlayFab | Client | Authentication ", meta = (BlueprintInternalUseOnly = "true"))
		static UPlayFabClientAPI* LoginWithCustomID(FClientLoginWithCustomIDRequest request,
			FDelegateOnSuccessLoginWithCustomID onSuccess,
			FDelegateOnFailurePlayFabError onFailure, UObject* customData);

How do I fix this linker error?

2

Did you ever fix this?

3

First you need to know the phase then start troubleshooting.

To create fully build you have following steps

→ preprocessing

→ compiling

→ linking

In linking stage, compiler links dynamic libraries to your object file. So basically when you have problem in linking stage, its related with your dlls.

Two cause here

  1. you are using mismatching libraries (use x86 lib on x64 software)
  2. you are not include your external plugin or module inside of build.cs file.

    Pretty much narrowed your search. Good luck
4

Its not as simple as that unfortunately, intelisense confirms that those methods exist and recognizes them with autocomplete, its just that when its going to compile it complains.

I have also triple checked that all modules are there in the build.cs file