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About FileReader and FlieWriter

i was build my replay system and i find a tutorial in wiki. https://wiki.unrealengine.com/Replay_System_Tutorial but when it comes to the following code, i couldn't fully understand what it means. TUniquePtr InfoFileArchive(IFileManager::Get().CreateFileReader(InfoFilename)); if (InfoFileArchive.IsValid() && InfoFileArchive->TotalSize() != 0) { FString JsonString; InfoFileArchive << JsonString; Info.FromJson(JsonString); Info.bIsValid = true; InfoFileArchive->Close(); } hope someone can explain how it works

Product Version: UE 4.18
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asked Feb 18 '18 at 03:13 PM in C++ Programming

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