# 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<IWebSocket> 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Amyue521CharacterACharacter* character = UGameplayStatics::GetPlayerCharacter(this->GetWorld(), 0);this->myCharacher = Cast<Amyue521Character>(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<Amyue521Character>(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);
      }