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需求#xff1a;在unreal中实现下载功能#xff0c;输入相关url网址#xff0c;本地文件夹存入相应文件。
一、代码示例
1.Build.cs需要新增Http模块#xff0c;样例如下。
PublicDependencyModuleNames.AddRange(new string[] { Core在unreal中实现下载功能输入相关url网址本地文件夹存入相应文件。
一、代码示例
1.Build.cs需要新增Http模块样例如下。
PublicDependencyModuleNames.AddRange(new string[] { Core, CoreUObject, Engine, InputCore, HTTP });2.RuntimeFilesDownloaderLibrary.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.hUENUM(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);
};3.RuntimeFilesDownloaderLibrary.cpp文件
#include RuntimeFilesDownloaderLibrary.h
#include HttpModule.h
#include Interfaces/IHttpRequest.h
#include Interfaces/IHttpResponse.h
//创建了一个URuntimeFilesDownloaderLibrary对象并将其添加到根对象防止系统自动回收
URuntimeFilesDownloaderLibrary* URuntimeFilesDownloaderLibrary::CreateDownloader()
{URuntimeFilesDownloaderLibrary* Downloader NewObjectURuntimeFilesDownloaderLibrary();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;/*ue4.27旧版本弃用下列方法*//*TSharedRefIHttpRequest, ESPMode::ThreadSafe HttpRequest FHttpModule::Get().CreateRequest();*///4.27及以后使用如下方法TSharedPtrIHttpRequest, ESPMode::ThreadSafe HttpRequest FHttpModule::Get().CreateRequest();HttpRequest-SetVerb(GET);HttpRequest-SetURL(FileURL);//HttpRequest-SetTimeout(TimeOut);//监听事件OnProcessRequestComplete绑定OnReady_InternalOnRequestProgress绑定OnProgress_InternalHttpRequest-OnProcessRequestComplete().BindUObject(this, URuntimeFilesDownloaderLibrary::OnReady_Internal);HttpRequest-OnRequestProgress().BindUObject(this, URuntimeFilesDownloaderLibrary::OnProgress_Internal);// Process the requestHttpRequest-ProcessRequest();return true;
}//监听事件
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);//查看文件夹没有则创建文件if (!PlatformFile.DirectoryExists(*Path)){if (!PlatformFile.CreateDirectoryTree(*Path)){OnResult.Broadcast(DirectoryCreationFailed);return;}}// 开启文件写入//通过PlatformFile.OpenWrite()函数打开文件句柄以便将下载的数据写入文件中。函数的参数是一个TCHAR类型的字符串表示文件的路径和文件名。//然后检查句柄是否成功打开。如果句柄成功打开就将HTTP请求响应中的数据通过FileHandle-Write()函数写入到文件中。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);}
}二、蓝图示例 该蓝图在关卡中调用通过Event Begin Play事件监听行为当按下 按钮创建DOWNLOADER对象并执行下载功能下载时对下载行为进行监听包括RESULTSuccessDownload failedSave failedDirectory creation failed四种下载结果)和以下三个数据信息
· BytesSent 表示已发送的字节数指示已经发送到服务器的字节数。
· BytesReceived 表示已接收的字节数指示已从服务器接收到的字节数。
· FullSize 表示完整内容的长度指示需要下载的文件的总字节数。
最后通过BytesReceived/FullSize计算出百分号数据实现下载进度实时追踪下载完成后RESULT枚举信息输出。
三、效果展示
在蓝图中输入url和save path相关信息time out为响应时间设置。
下载过程实现监听下载完成后输出RESULT枚举类型。
最后本地文件夹成功下载http文件。
