What am I missing about SaveGame?

Development Programming & Scripting C++
5

I found a simpler solution :slight_smile:

I can write objects to memory using FObjectWriter, and read them back using FObjectReader, and then serialize to the savegame object as byte arrays.
I don’t need the whole dynamic object stuff from a structured archive, nor from the linker loader, I just load data into a pre-determined object hierarchy I create as default subobjects on construction, so this works well!


USaveGameMine::USaveGameMine()
{
  MyObject = CreateDefaultSubobject<UMyObjectClass>(this, FName(TEXT("MyObject")));
}

void USaveGameMine::Serialize(FArchive& Ar)
{
  TArray<uint8> mem;
  if (Ar.IsSaving()) {
    FObjectWriter wr(MyObject, mem);
    uint8 v = 0;
    if ((int)mem.Num() < 1) {
      UE_LOG(LogBlueprintUserMessages, Error, TEXT("Bad size of serialized archive: %d"), (int)mem.Num());
      Ar << v;
      return;
    }
    v = 1;
    Ar << v;
    uint32 sz = mem.Num();
    Ar << sz;
    Ar.Serialize(&mem[0], mem.Num());
  }
  else if (Ar.IsLoading()) {
     uint8 ver = 0;
    Ar << ver;
    if (ver != 1) {
      UE_LOG(LogBlueprintUserMessages, Error, TEXT("Bad version number in character save: %d"), (int)ver);
      return;
    }
    uint32 size = 0;
    Ar << size;
    if (size < 1 || size > MAX_CHARACTER_SIZE) {
      UE_LOG(LogBlueprintUserMessages, Error, TEXT("Bad size in character save: %d"), (int)size);
      return;
    }
    mem.InsertUninitialized(0, size);
    Ar.Serialize(&mem[0], size);
    FObjectReader rd(MyObject, mem);
  }
  else {
    Super::Serialize(Ar);
  }
}

I have some more code to deal with more properties of the savegame and also set some status flags based on success/failure, but this should illustrate the concept well enough.