unreal-c++教程-第九章:c++发送消息给蓝图

• 1. 背景介绍
• 2. c++代码
• 3.创建蓝图

我们希望在c++中完成一些操作，比如定义socket，接收到服务器的消息之后，通过蓝图来处理
这个时候，就需要让c++发送消息给蓝图

1. 一个简单的例子：
   我们在c++中定义了一个OnReceiveMsg(float val)的函数
   我们在Tick函数中不断的调用这个函数，那么，我们希望通过蓝图来重写这个函数的具体实现：
   

.h文件

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Client.generated.h"

UCLASS()
class LUAX_API AClient : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AClient();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;
	UFUNCTION(BlueprintNativeEvent, Category = "Switch Functions")
	void OnReceiveMsg(float val);

	void OnReceiveMsg_Implementation(float val);
};

.cpp文件

// Fill out your copyright notice in the Description page of Project Settings.


#include "Client.h"
//#include "UnLua/"
//#include "UnLua/"
// Sets default values
AClient::AClient()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;
	
}

// Called when the game starts or when spawned
void AClient::BeginPlay()
{

	Super::BeginPlay();
	
}

// Called every frame
void AClient::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	OnReceiveMsg(DeltaTime);

}




void AClient::OnReceiveMsg_Implementation(float val)
{

}

我们将该Test的Acator拖拽到UWorld中时，我们会发现，我们成功的接收到来自c++的消息