Overview

Runtime Files Downloader is a plugin for downloading files over HTTP / HTTPS at runtime.

How to use

If you need to save a file to storage, then you need to call DownloadFileToStorage function.

Blueprint

C++

UFileToStorageDownloader::DownloadFileToStorage(TEXT("https://example.com/File.zip"), TEXT("C:/Folder/File.zip"), 15.0f, TEXT(""), false,
   FOnDownloadProgressNative::CreateLambda([](int64 BytesReceived, int64 ContentSize, float ProgressRatio)
   {
       UE_LOG(LogTemp, Log, TEXT("Download progress: %f"), ProgressRatio);
   }), FOnFileToStorageDownloadCompleteNative::CreateLambda([](EDownloadToStorageResult Result, const FString& SavedPath, UFileToStorageDownloader* Downloader)
   {
       UE_LOG(LogTemp, Log, TEXT("Download complete, result: %s, saved path: %s"), *UEnum::GetValueAsString(Result), *SavedPath);
   }));

If you do not need to save the file, but just get access to the downloaded content, then you need to call DownloadFileToMemory function.

Blueprint

C++

UFileToMemoryDownloader::DownloadFileToMemory(TEXT("https://example.com/File.zip"), 15.0f, TEXT(""), false,
   FOnDownloadProgressNative::CreateLambda([](int64 BytesReceived, int64 ContentSize, float ProgressRatio)
   {
       UE_LOG(LogTemp, Log, TEXT("Download progress: %f"), ProgressRatio);
   }), FOnFileToMemoryDownloadCompleteNative::CreateLambda([](const TArray64<uint8>& DownloadedContent, EDownloadToMemoryResult Result, UFileToMemoryDownloader* Downloader)
   {
       UE_LOG(LogTemp, Log, TEXT("Download complete, result: %s, DownloadedContent size: %d"), *UEnum::GetValueAsString(Result), DownloadedContent.Num());
   }));

Optionally, you can specify the type of file to download by entering a MIME type in the Content Type field.

A list of the most common MIME types is listed here.

After the download has started, you can cancel it using the CancelDownload function.

Blueprint

C++

// Assuming Downloader is a UE reference to a UFileToStorageDownloader or UFileToMemoryDownloader object
Downloader->CancelDownload();

Please note that starting from UE 5.4, the Timeout parameter behaves in a way that cancels the request during the download itself if the overall time taken for downloading exceeds the Timeout, which is somewhat a bug in UE. Please either specify a large value (such as 3600 seconds, which is 1 hour) or specify it as zero to disable the Timeout completely.

Live example

There is an example of a simple Android game that demonstrates the plugin's ability.