unreal-c++教程-第九章:c++发送消息给蓝图

ChuanXin

c++发送消息给蓝图

1. 背景介绍2. c++代码3.创建蓝图

1. 背景介绍

1. 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
2. 这个时候，就需要让c++发送消息给蓝图

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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：

2. c++代码

.h文件

1. #pragmaonce#include"CoreMinimal.h"#include"GameFramework/Actor.h"#include"Client.generated.h"UCLASS()
2. class LUAX_API AClient : public AActor
3. {GENERATED_BODY()
4.        
5. public:// Sets default values for this actor's propertiesAClient();
7. protected:// Called when the game starts or when spawned
8.         virtual voidBeginPlay() override;
10. public:// Called every frame
11.         virtual voidTick(float DeltaTime) override;UFUNCTION(BlueprintNativeEvent, Category ="Switch Functions")voidOnReceiveMsg(float val);voidOnReceiveMsg_Implementation(float val);};

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.cpp文件

1. // Fill out your copyright notice in the Description page of Project Settings.#include"Client.h"//#include "UnLua/"//#include "UnLua/"// Sets default values
2. AClient::AClient(){// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
3.         PrimaryActorTick.bCanEverTick = true;}// Called when the game starts or when spawnedvoid AClient::BeginPlay(){
5.         Super::BeginPlay();}// Called every framevoid AClient::Tick(float DeltaTime){
6.         Super::Tick(DeltaTime);OnReceiveMsg(DeltaTime);}void AClient::OnReceiveMsg_Implementation(float val){}

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3.创建蓝图

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