UE4C++ Http下载文件

成果

功能:点击一个按钮可以远程下载文件并看得到进度条

先上代码
.h文件

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "UObject/Object.h"
#include "Interfaces/IHttpRequest.h"
#include "RuntimeFilesDownloaderLibrary.generated.h"/*** */
UENUM(BlueprintType, Category = "Runtime Files Downloader")
enum DownloadResult
{SuccessDownloading UMETA(DisplayName = "Success"),DownloadFailed UMETA(DisplayName = "Download failed"),SaveFailed UMETA(DisplayName = "Save failed"),DirectoryCreationFailed UMETA(DisplayName = "Directory creation failed")
};
DECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FOnFilesDownloaderProgress, const int32, BytesSent, const int32, BytesReceived,const int32, ContentLength);/***/
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnFilesDownloaderResult, TEnumAsByte < DownloadResult >, Result);UCLASS()
class DOWNLOAD_API URuntimeFilesDownloaderLibrary : public UObject
{GENERATED_BODY()
public:UPROPERTY(BlueprintAssignable, Category = "Runtime Files Downloader")FOnFilesDownloaderProgress OnProgress;/***/UPROPERTY(BlueprintAssignable, Category = "Runtime Files Downloader")FOnFilesDownloaderResult OnResult;/***/UPROPERTY(BlueprintReadOnly, Category = "Runtime Files Downloader")FString FileURL;/***/UPROPERTY(BlueprintReadOnly, Category = "Runtime Files Downloader")FString FileSavePath;/***/UFUNCTION(BlueprintCallable, Category = "Runtime Files Downloader")static URuntimeFilesDownloaderLibrary* CreateDownloader();/***/UFUNCTION(BlueprintCallable, Category = "Runtime Files Downloader")bool DownloadFile(const FString& URL, const FString& SavePath, float TimeOut = 5);
private:void OnProgress_Internal(FHttpRequestPtr Request, int32 BytesSent, int32 BytesReceived);/****/void OnReady_Internal(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful);
};

.cpp文件

// Fill out your copyright notice in the Description page of Project Settings.#include "RuntimeFilesDownloaderLibrary.h"
#include "HttpModule.h"
#include "Interfaces/IHttpRequest.h"
#include "Interfaces/IHttpResponse.h"URuntimeFilesDownloaderLibrary* URuntimeFilesDownloaderLibrary::CreateDownloader()
{URuntimeFilesDownloaderLibrary* Downloader = NewObject<URuntimeFilesDownloaderLibrary>();Downloader->AddToRoot();return Downloader;
}bool URuntimeFilesDownloaderLibrary::DownloadFile(const FString& URL, const FString& SavePath, float TimeOut)
{if (URL.IsEmpty() || SavePath.IsEmpty() || TimeOut <= 0){return false;}FileURL = URL;FileSavePath = SavePath;//TSharedRef<IHttpRequest, ESPMode::ThreadSafe> HttpRequest = FHttpModule::Get().CreateRequest();TSharedPtr<IHttpRequest, ESPMode::ThreadSafe> HttpRequest = FHttpModule::Get().CreateRequest();HttpRequest->SetVerb("GET");HttpRequest->SetURL(FileURL);//HttpRequest->SetTimeout(TimeOut);HttpRequest->OnProcessRequestComplete().BindUObject(this, &URuntimeFilesDownloaderLibrary::OnReady_Internal);HttpRequest->OnRequestProgress().BindUObject(this, &URuntimeFilesDownloaderLibrary::OnProgress_Internal);// Process the requestHttpRequest->ProcessRequest();return true;
}void URuntimeFilesDownloaderLibrary::OnProgress_Internal(FHttpRequestPtr Request, int32 BytesSent, int32 BytesReceived)
{const FHttpResponsePtr Response = Request->GetResponse();if (Response.IsValid()){const int32 FullSize = Response->GetContentLength();OnProgress.Broadcast(BytesSent, BytesReceived, FullSize);}
}void URuntimeFilesDownloaderLibrary::OnReady_Internal(FHttpRequestPtr Request, FHttpResponsePtr Response,bool bWasSuccessful)
{RemoveFromRoot();Request->OnProcessRequestComplete().Unbind();if (Response.IsValid() && EHttpResponseCodes::IsOk(Response->GetResponseCode()) && bWasSuccessful){//IPlatformFile& PlatformFile = FPlatformFileManager::Get().GetPlatformFile();// FString Path, Filename, Extension;FPaths::Split(FileSavePath, Path, Filename, Extension);if (!PlatformFile.DirectoryExists(*Path)){if (!PlatformFile.CreateDirectoryTree(*Path)){OnResult.Broadcast(DirectoryCreationFailed);return;}}// IFileHandle* FileHandle = PlatformFile.OpenWrite(*FileSavePath);if (FileHandle){// FileHandle->Write(Response->GetContent().GetData(), Response->GetContentLength());// delete FileHandle;OnResult.Broadcast(SuccessDownloading);}else{OnResult.Broadcast(SaveFailed);}}else{OnResult.Broadcast(DownloadFailed);}
}

代码参考的知乎大佬注意UE4.27 http里

 TSharedRef<IHttpRequest> HttpRequest = FHttpModule::Get().CreateRequest();注意这段代码已经不适用了 根据UE官方源码4.27已经修改成TSharedPtr<IHttpRequest, ESPMode::ThreadSafe> Request = FHttpModule::Get().CreateRequest();

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