[UE4] HTTP 통신으로 파일 다운로드 + Json

출처1, 출처2

• Object 상속 받아 사용

  • 일단 Actor 형식은 http 가능, Actor Component는 Bind에서 오류

header

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

#pragma once

#include "CoreMinimal.h"
#include "Http.h"
#include "UObject/NoExportTypes.h"
#include "RestAPI.generated.h"


UCLASS()
class UNREALTEST_API URestAPI : public UObject
{
	GENERATED_BODY()
	
public:
	// Sets default values for this component's properties
	URestAPI();

	FString Post(FString id, FString num);
	FString Get();
	FString Put(FString id, FString num);
	FString Delete();

	FString PostResponse;
	FString GetResponse;
	FString PutResponse;
	FString DeleteResponse;

protected:

	void ResponseOfPostAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully);
	void ResponseOfGetAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully);
	void ResponseOfPutAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully);
	void ResponseOfDeleteAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully);


};

cpp

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


#include "RestAPI.h"

FString URestAPI::Post(FString id, FString num)
{
	if (GEngine)
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Post Request"));

	FHttpRequestRef Request = FHttpModule::Get().CreateRequest();
	TSharedRef<FJsonObject> RequestObj = MakeShared<FJsonObject>();
	//RequestObj->SetStringField("id", "cucu154");
	RequestObj->SetStringField("id", *id);
	RequestObj->SetStringField("num", *num);

	FString RequestBody;
	TSharedRef<TJsonWriter<>> Writer = TJsonWriterFactory<>::Create(&RequestBody);
	FJsonSerializer::Serialize(RequestObj, Writer);

	Request->OnProcessRequestComplete().BindUObject(this, &URestAPI::ResponseOfPostAPI);
	Request->SetURL("<http://localhost:8080/post>");
	Request->SetVerb("POST");
	Request->SetHeader("Content-Type", "application/json");
	Request->SetContentAsString(RequestBody);
	Request->ProcessRequest();

	return PostResponse;
}

FString URestAPI::Get()
{
	if (GEngine)
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Get Request"));

	FHttpRequestRef Request = FHttpModule::Get().CreateRequest();
	Request->OnProcessRequestComplete().BindUObject(this, &URestAPI::ResponseOfGetAPI);
	Request->SetURL("http://localhost:8080/get");
	Request->SetVerb("GET");
	Request->ProcessRequest();

	return GetResponse;
}


FString URestAPI::Put(FString id, FString num)
{
	if (GEngine)
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Put Request"));

	FHttpRequestRef Request = FHttpModule::Get().CreateRequest();
	TSharedRef<FJsonObject> RequestObj = MakeShared<FJsonObject>();
	//RequestObj->SetStringField("id", "cucu154");
	RequestObj->SetStringField("id", *id);
	RequestObj->SetStringField("num", *num);

	FString RequestBody;
	TSharedRef<TJsonWriter<>> Writer = TJsonWriterFactory<>::Create(&RequestBody);
	FJsonSerializer::Serialize(RequestObj, Writer);

	Request->OnProcessRequestComplete().BindUObject(this, &URestAPI::ResponseOfPutAPI);
	Request->SetURL("<http://localhost:8080/put>");
	Request->SetVerb("POST");
	Request->SetHeader("Content-Type", "application/json");
	Request->SetContentAsString(RequestBody);
	Request->ProcessRequest();

	return PutResponse;

}


FString URestAPI::Delete()
{
	if (GEngine)
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Delete Request"));

	FHttpRequestRef Request = FHttpModule::Get().CreateRequest();
	Request->OnProcessRequestComplete().BindUObject(this, &URestAPI::ResponseOfDeleteAPI);
	Request->SetURL("http://localhost:8080/delete");
	Request->SetVerb("GET");
	Request->ProcessRequest();

	return DeleteResponse;
}

void URestAPI::ResponseOfPostAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully)
{
	TSharedPtr<FJsonObject> ResponseObj;
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());
	FJsonSerializer::Deserialize(Reader, ResponseObj);

	if (GEngine) {
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, *Response->GetContentAsString());
	}

	 PostResponse = *Response->GetContentAsString();

}

void URestAPI::ResponseOfGetAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully)
{
	TSharedPtr<FJsonObject> ResponseObj;
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());
	FJsonSerializer::Deserialize(Reader, ResponseObj);

	if (GEngine) {
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, *Response->GetContentAsString());
	}

	 GetResponse = *Response->GetContentAsString();


}

void URestAPI::ResponseOfPutAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully)
{
	TSharedPtr<FJsonObject> ResponseObj;
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());
	FJsonSerializer::Deserialize(Reader, ResponseObj);

	if (GEngine) {
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, *Response->GetContentAsString());
	}

	PutResponse = *Response->GetContentAsString();
}

void URestAPI::ResponseOfDeleteAPI(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bConnectedSuccessfully)
{
	TSharedPtr<FJsonObject> ResponseObj;
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());
	FJsonSerializer::Deserialize(Reader, ResponseObj);

	if (GEngine) {
		GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, *Response->GetContentAsString());
	}

	DeleteResponse = *Response->GetContentAsString();
}