UE4 - How to use UE_LOG In Custom Plugins

The result in at the end of the article.

UE_LOG and AddOnScreenDebugMessage doesn't work in my case

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Hi, i made my custom actor based class Steam_Function_actor_based, inside it i made a method UE_RequestLobbyList() Steam_Function_actor_based.h // Fill out your copyright notice in the Description page of Project Settings. #pragma once #include "GameFramework/Actor.h" #include "Steam_Function_actor_based.generated.h" UCLASS() class STEAM_TRAINING_API ASteam_Function_actor_based : public AActor { GENERATED_BODY() public: // Sets default values for this actor's properties ASteam_Function_actor_based(); // Called when the game starts or when spawned virtual void BeginPlay() override; // Called every frame virtual void Tick( float DeltaSeconds ) override; UFUNCTION(BlueprintCallable, Category = "Steam") void UE_RequestLobbyList(); };   and made method body in Steam_Function_actor_based.cpp // Fill out your copyright notice in the Description page of Project Settings. #include "steam_training.h" #include "Steam_Function_actor_based.h" #include "steam_api.h" #pragma comment(lib, "steam_api64.lib") void ASteam_Function_actor_based::UE_RequestLobbyList() { UE_LOG(LogTemp, Warning, TEXT("hSteamAPICall")); GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("hSteamAPICall")); SteamAPICall_t hSteamAPICall = SteamMatchmaking()->RequestLobbyList(); //SteamAPI_SetMiniDumpComment("Minidump comment: SteamworksExample.exe\n"); //SteamAPI_WriteMiniDump(1, 0, 0); UE_LOG(LogTemp, Warning, TEXT("hSteamAPICall is %d"), hSteamAPICall); GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("hSteamAPICall is %d"), hSteamAPICall)); }   so when i call my method from blueprint, execution lines show method called https://yadi.sk/i/U1bZIsPfgSD9J , but no onscreen message and no log message, why? i also tryed call my method in other way - by casting after jump and casting fail (target variable just empty) to be clear, i use 4.7.6 UE version investigated interesting thing - Print String from blueprints work fine, but UE_LOG(LogTemp, Warning, TEXT("hSteamAPICall")); GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("hSteamAPICall"));   from my custom method won't at all, but i call Print String after my method in blueprint graph https://yadi.sk/i/QzwY9Lw3gSLUu re: You are aware that UE4 has a common interface to support variues online services under same APIs (called OnlineSubsystem) and has SteamWorks support ready? https://docs.unrealengine.com/latest/INT/Programming/Online/index.htmlhttps://docs.unrealengine.com/latest/INT/Programming/Online/Steam/index.htmlhttps://docs.unrealengine.com/latest/INT/API/Runtime/OnlineSubsystem/index.html futher investigation lead me to https://www.youtube.com/watch?t=1543&v=t-7JYG9rvWM, i added DEFINE_LOG_CATEGORY(MyLog); //into my class .cpp also added DECLARE_LOG_CATEGORY_EXTERN(MyLog, Log, All); //into my class .h made blueprint built from my class actor and added that new blueprint into blueprint SideScrollerCharacter that drive your character by default after debug -> run new instance in VS i could get in output log my message MyLog:Warning: hSteamAPICall**** and seems it appeared on screen, but i also got back return bool value and error LogVoice:Warning: Failed to initialize voice interface LogScript:Warning: Accessed None 'target' SideScrollerExampleMap_C /Game/SideScrollerBP/Maps/UEDPIE_0_SideScrollerExampleMap.SideScrollerExampleMap:PersistentLevel.SideScrollerExampleMap_C_2 Function /Game/SideScrollerBP/Maps/SideScrollerExampleMap.SideScrollerExampleMap_C:ExecuteUbergraph_SideScrollerExampleMap:001F PIE:Error: Error Accessed None 'target' from node Event Begin Play in blueprint SideScrollerExampleMap so do you have any idea why this PIE:Error: happen?

example :

DECLARE_LOG_CATEGORY_EXTERN(MyLog, Log, All); //into my class .h

DEFINE_LOG_CATEGORY(MyLog); //into my class .cpp

UE_LOG(MyLog, Warning, TEXT("%f , %f, %f"), Start.X, Start.Y, Start.Z); //use example

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