UE5- c++ websocket里实现调用player里的方法

# UGameInstance里直接调用

获取到引用了，就可以自然的调用。忽略

# UGameInstance里间接调用，通过代理调用

1. 前置已经添加了websocket,具体步骤参考，链接
2. 在UWebSocketGameInstance.h里新增代理，并在链接成功后进行绑定。

   #pragma once
    
    
   #include "myue521Character.h"
   #include "CoreMinimal.h"
   #include "Engine/GameInstance.h"
   #include "WebSockets/Public/IWebSocket.h"
   #include "UWebSocketGameInstance.generated.h"
    
   DECLARE_DELEGATE_OneParam(JSONMessageTrigger, FString)
   /**
    * 
    */
   UCLASS()
   class MYUE521_API UUWebSocketGameInstance : public UGameInstance
   {
    
   	GENERATED_BODY()
   public:
   	JSONMessageTrigger JSONMessageTrigger;
    
   public:
   	virtual void Init() override;
   	virtual void Shutdown() override;
   	TSharedPtr WebSocket;
    
    
   	 
   	void OnConnected();
   	void OnConnectionError(const FString& Error);
   	void OnClosed(int32 StatusCode, const FString& Reason, bool bWasClean);
   	void OnMessage(const FString& Message); // 接收消息时
   	void OnMessageSent(const FString& MessageString); // 发送消息时
   private:
   	Amyue521Character* myCharacher;
   public: 
   	Amyue521Character* getMyCharacher();
   	
    
   };
   

   说明，

   1. 声明一个代理。DECLARE_DELEGATE_OneParam(JSONMessageTrigger, FString)

   2. 声明触发器。public:
          JSONMessageTrigger JSONMessageTrigger;

   3. 下面到实现类里进行绑定，我这里是在UWebSocketGameInstance.cpp里，socket链接成功后进行绑定。

3. 绑定，并调用。这里尝试着获取到目标characher.

   Amyue521Character* UUWebSocketGameInstance::getMyCharacher() {
   	if (this->myCharacher != nullptr) {
   		return this->myCharacher;
   	}
   //获取player,并转化为Amyue521Character
   	ACharacter* character = UGameplayStatics::GetPlayerCharacter(this->GetWorld(), 0);
   	this->myCharacher = Cast(character);
    
   	if (this->myCharacher != nullptr) {
   //转化成功后则进行绑定
   		JSONMessageTrigger.BindUObject(this->myCharacher, &Amyue521Character::CallBackFunMul);
    
   //模拟触发，这个触发实际应该放到收到message方法里执行
   		FString TestHUDString = FString(TEXT("my json msg"));
   		JSONMessageTrigger.ExecuteIfBound(TestHUDString);
   	}
   	return this->myCharacher;
    
   }
    
   void UUWebSocketGameInstance::OnConnected()
   {
   	UE_LOG(LogTemp, Warning, TEXT("%s"), *FString(__FUNCTION__));
    
   	GEngine->AddOnScreenDebugMessage(-1, 3.0f, FColor::Green, "Successfully Connected");
    
   	this->getMyCharacher();
    
   }
   

   说明：

   1. 这里进行了代码简化，链接成功后将获取的player转化为目标Characher

      ACharacter* character = UGameplayStatics::GetPlayerCharacter(this->GetWorld(), 0);
      this->myCharacher = Cast(character);
      

   2. 绑定

      if (this->myCharacher != nullptr) {
      	JSONMessageTrigger.BindUObject(this->myCharacher, &Amyue521Character::CallBackFunMul);
       
      }
      

   3. 触发，这个触发实际应该放到收到OnMessage方法里执行

      if (this->myCharacher != nullptr) { 
      	FString TestHUDString = FString(TEXT("my json msg"));
      	JSONMessageTrigger.ExecuteIfBound(TestHUDString);
      }