[UE5.3.2][VisualStudio][Cpp]UnrealEngineのCPPプラグインからOpenAI(ChatGPT4o)を呼んで返り値jsonからパースしてメッセージをとる

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

#pragma once

#include "CoreMinimal.h"
#include "Http.h"
#include "Json.h"
#include "GameFramework/Actor.h"
#include "CurlApiTest.generated.h"


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

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

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;



	UFUNCTION(BlueprintCallable, Category = "Http")
	void SendChatCompletionRequest();
	void ProcessResponseSimple(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful);
	//void ProcessResponse(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful);
};

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


#include "CurlApiTest.h"
#include "CurlRequest.h"
#include "Http.h"
#include "Json.h"
#include "Misc/Paths.h"
#include "Misc/ConfigCacheIni.h"

// Sets default values
ACurlApiTest::ACurlApiTest()
{
 	// 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 ACurlApiTest::BeginPlay()
{
	Super::BeginPlay();
	SendChatCompletionRequest();
}

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

}



void ACurlApiTest::SendChatCompletionRequest()
{
	FString ApiKey = TEXT("sk-から始まる秘密鍵");

	TSharedRef<IHttpRequest> HttpRequest = FHttpModule::Get().CreateRequest();
	HttpRequest->SetURL("https://api.openai.com/v1/chat/completions");
	HttpRequest->SetVerb("POST");
	HttpRequest->SetHeader("Content-Type", "application/json");
	HttpRequest->SetHeader("Authorization", "Bearer " + ApiKey);

	// JSON Body
	FString Content = TEXT(R"(
    {
        "model": "gpt-4o-mini",
        "messages": [{"role": "user", "content": "Say this is a test!"}],
        "temperature": 0.7
    }
    )");

	HttpRequest->SetContentAsString(Content);

	HttpRequest->OnProcessRequestComplete().BindUObject(this, &ACurlApiTest::ProcessResponseSimple);
	/*
	HttpRequest->OnProcessRequestComplete().BindLambda([this](FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
		{
			ProcessResponse(Request, Response, bWasSuccessful);
		});
	*/
	HttpRequest->ProcessRequest();
}



void ACurlApiTest::ProcessResponseSimple(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{
	if (bWasSuccessful && Response.IsValid())
	{
		FString ResponseContent = Response->GetContentAsString();
		TSharedPtr<FJsonObject> JsonObject;
		TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(ResponseContent);

		if (FJsonSerializer::Deserialize(Reader, JsonObject) && JsonObject.IsValid())
		{
			FString MessageContent = JsonObject->GetArrayField("choices")[0]->AsObject()->GetObjectField("message")->GetStringField("content");
			UE_LOG(LogTemp, Warning, TEXT("Response Message: %s"), *MessageContent);
		}
		else
		{
			UE_LOG(LogTemp, Error, TEXT("Failed to parse JSON response"));
		}
	}
	else
	{
		UE_LOG(LogTemp, Error, TEXT("Request failed"));
	}


}