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Tutorial c++ code ended up with link error

Hi, I'm following the "3rd Person Power-up Game with C++" video, and I'm at the 3rd video writing the Pickup class, i'm on 4.7.6, well i followed all the transion guide that i can find to correct the code incompatibility, but eventually I still get this link error :

unresolved external symbol "public: virtual void __cdecl APickUp::OnPickedup_Implementation(void)" (?OnPickedup_Implementation@APickUp@@UEAAXXZ),

and also a warning says "Function PickUp::OnPickedup needs native implementation by virtual void OnPickedup_Implementation() due to its properties" exists.

originally i didn't declare "void OnPickedup_Implementaion(); " manually, in that case, one compile warning says that it would be generated by UHT but in next version it should be declared manually, and then another error followed saying my "OnPickedup_Implementaion" is not declared which prevents me from advancing, so i searched and followed another thread which added the declaration manually and then ended up with the link error. really appreciate if someone can help me take a look:

Here's the my code: PickUp.h:

 #pragma once
 #include "GameFramework/Actor.h"
 #include "PickUp.generated.h"
 class POWERUPDEMO_API APickUp : public AActor
     virtual void BeginPlay() override;
     // Called every frame
     virtual void Tick( float DeltaSeconds ) override;
     //This one is added manually by Austin
     APickUp(const FObjectInitializer &ObjectInitializer);
     //Customized properties by Austin
     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Pickup)
         bool bIsActive;
     UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly, Category = Pickup)
         USphereComponent* BaseCollisionComponent;
     UPROPERTY(VisibleDefaultsOnly, BlueprintReadOnly, Category = Pickup)
         UStaticMeshComponent* PickupMesh;
     void OnPickedup();
     virtual void OnPickedup_Implementaion();


 #include "PowerUpDemo.h"
 # include "PickUp.h"
     PrimaryActorTick.bCanEverTick = true;
 APickUp::APickUp(const FObjectInitializer &PCIP)
     bIsActive = true;
     BaseCollisionComponent = PCIP.CreateDefaultSubobject<USphereComponent>(this, TEXT("AustinBaseSphereComponent"));
     RootComponent = BaseCollisionComponent;
     PickupMesh = PCIP.CreateDefaultSubobject<UStaticMeshComponent>(this, TEXT("AustinPickupMesh"));
 void APickUp::OnPickedup_Implementaion()
 void APickUp::BeginPlay()
 void APickUp::Tick( float DeltaTime )
     Super::Tick( DeltaTime );

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asked May 04 '15 at 05:57 PM in C++ Programming

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avatar image kostor May 04 '15 at 06:25 PM

I understood almost nothing, but did you actually implement the function in cpp file?

avatar image zzAustin May 05 '15 at 02:03 AM

yes, the thing i did over and over is checking if the implementation matches the declaration. i even added __cdecl according to the error and still can't get pass.

i think UFUNCTION(BlueprintNativeEvent) actually did declare something, but i just don't know how can i implement it to match its form.

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1 answer: sort voted first

There's a spelling error in your function declaration:

Instead of


it should be


I think Blueprints specifically looks for the function "_Implementation"

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answered May 05 '15 at 06:45 AM

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avatar image zzAustin May 05 '15 at 07:21 AM

staticvoidlol thanks for checking it for me, i will be more careful in the future

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