C++到蓝图

#include "Runtime/Engine/Classes/Kismet/KismetSystemLibrary.h"  
UKismetSystemLibrary::PrintString(this, s)  //KismetSystemLibrary 继承UObject

DEFINE_LOG_CATEGORY_STATIC(LogName, Log, All); //.cpp文件声明LOG。注：LogName不能重，Log是个枚举，All是个枚举
UE_LOG(LogName, Log, TEXT("abc %s"),s);//可以像Printf样打印出

DECLARE_LOG_CATEGORY_EXTERN(AAAAA, Log, All); //在.h文件声明LOG
DEFINE_LOG_CATEGORY(AAAAA);//在.cpp文件使用

#include "Engine/Engine.h"
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("%s %f"), *Msg, Value));//引擎打LOG

UFUNCTION(BlueprintCallable, Category = "test")
void SendMsg(FString msg);//蓝图输入函数

UFUNCTION(BlueprintImplementableEvent, meta = (DisplayName = "ReceiveEvent"))
void ReceiveEvent(const FString& message);//蓝图接收函数

UFUNCTION(BlueprintPure, Category = "TAMediator")  //蓝图输出 绿色