LNK2019 Unresolved External Symbol Error

Development Programming & Scripting C++
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1

I’m using a Plugin called Firebase Analytics
I have created a function in a BlueprintFunctionLibrary and in there I’m just calling a function

UFirebaseAnalyticsSubsystem::GetBuiltinEventNames();

provided by the plugin and that is giving me the error!

I have added FirebaseAnalytics Dependency to PublicDependencyModuleNames field in my buil.cs file!

PublicDependencyModuleNames.AddRange(new string { “Core”, “CoreUObject”, “Engine”, “InputCore”, “PhysXVehicles”, “Niagara”, “UMG”, “PhysicsCore”, “FirebaseAnalytics” });

And I have also deleted Intermediate and Binaries folder from my project but Nothing works!
Please Help ME!

error:

>MyAnalyticsHelper.cpp.obj : error LNK2019: unresolved external symbol "public: static class TMap<enum EBuiltinEventNames,class FString,class FDefaultSetAllocator,struct TDefaultMapHashableKeyFuncs<enum EBuiltinEventNames,class FString,0> > __cdecl UFirebaseAnalyticsSubsystem::GetBuiltinEventNames(void)" (?GetBuiltinEventNames@UFirebaseAnalyticsSubsystem@@SA?AV?$TMap@W4EBuiltinEventNames@@VFString@@VFDefaultSetAllocator@@U?$TDefaultMapHashableKeyFuncs@W4EBuiltinEventNames@@VFString@@$0A@@@@@XZ) referenced in function "public: static void __cdecl UMyAnalyticsHelper::AddEventLevelStart(class FString const &)" (?AddEventLevelStart@UMyAnalyticsHelper@@SAXAEBVFString@@@Z)

1>E:\Unreal Projects\CarParking\Binaries\Win64\UE4Editor-CarParkig-0012.dll : fatal error LNK1120: 1 unresolved externals

.h file :

UCLASS()
class CARPARKIG_API UMyAnalyticsHelper : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()
public:
	UFUNCTION(BlueprintCallable, Category = "MyAnalyticsHelper")
	static void AddEventLevelStart(const FString& LevelNameValue);
};

.cpp file :

#include "Analytics/MyAnalyticsHelper.h"
#include "FirebaseAnalyticsSubsystem.h"

void UMyAnalyticsHelper::AddEventLevelStart(const FString& LevelNameValue)
{
	TMap<EBuiltinEventNames, FString> BuiltinEventNames;	
	BuiltinEventNames = UFirebaseAnalyticsSubsystem::GetBuiltinEventNames();
	.....
	......
}

Please Help Me!
Thanks

2

The issue here is, that FirebaseAnalytics Plugin doesn’t export its API do be used in other modules, I think. Add the FIREBASEANALYTICS_API specifier to the Subsystem class and it should work.

“FirebaseAnalyticsSubsystem.h”

class FIREBASEANALYTICS_API UFirebaseAnalyticsSubsystem : public UGameInstanceSubsystem
{
GENERATED_BODY()
…
};

3

Sorry for late reply.
But it didn’t worked.

4

SOLVED!

I just had to use

#if PLATFORM_ANDROID

Like:

void UMyAnalyticsHelper::AddEventLevelStart(const FString& LevelNameValue)
{
#if PLATFORM_ANDROID
	TMap<EBuiltinEventNames, FString> BuiltinEventNames;	
	BuiltinEventNames = UFirebaseAnalyticsSubsystem::GetBuiltinEventNames();
	.....
	......
#endif
}

Now it compiles well and also works well!