Load map from PAK

Development Programming & Scripting C++
1

Hi guys, I have a method that’s meant to load a map from a PAK file from local disk. Loading the PAK from disk works however I can’t seem to repath the map so ServerTravel works. How do I get the path of the mounted map that’s loaded from the PAK? The method in question is below:


void UMapManager::LoadMap(FString MapName, UWorld* World)
{
	IPlatformFile& InnerPlatform = FPlatformFileManager::Get().GetPlatformFile();
	FPakPlatformFile* PakPlatform = new FPakPlatformFile();
	FPakFile* Pak = new FPakFile(*(UMapManager::GenerateMapFullPath(MapName)), false);

	// Initialize the variables
	PakPlatform->Initialize(&InnerPlatform, TEXT(""));
	Pak->SetMountPoint(*FPaths::EngineContentDir());

	// Mount the pak file
	if(PakPlatform->Mount(*(UMapManager::GenerateMapFullPath(MapName)), 0, *FPaths::EngineContentDir()))
		GEngine->AddOnScreenDebugMessage(2, 5.0f, FColor::Green, TEXT("PAK loaded"));
	else
		GEngine->AddOnScreenDebugMessage(2, 5.0f, FColor::Red, TEXT("PAK not loaded"));

	// Iterate through all the files in the pak
	TArray<FStringAssetReference> AssetFiles;
	TSet<FString> FileList;
	Pak->FindFilesAtPath(FileList, *FPaths::EngineContentDir(), true, false, true);
	for(TSet<FString>::TConstIterator FileItem(FileList); FileItem; ++FileItem)
	{
		FString AssetName = *FileItem;
		GEngine->AddOnScreenDebugMessage(4, 5.0f, FColor::Red, *AssetName);

		if(AssetName.EndsWith(FPackageName::GetMapPackageExtension()))
		{
			FString MapPath = "/Engine/";

			// Change the path to be engine path
			FString AssetShortName = FPackageName::GetShortName(AssetName);
			AssetShortName.RemoveFromEnd(FPackageName::GetMapPackageExtension());

			MapPath += AssetShortName + "." + AssetShortName;
			GEngine->AddOnScreenDebugMessage(5, 5.0f, FColor::Red, *MapPath);
			
			// Load the actual map that's found
			if(World)
				World->ServerTravel(FPaths::GameContentDir() + AssetShortName);
			else
				GEngine->AddOnScreenDebugMessage(3, 5.0f, FColor::Green, "Invalid world pointer");
		}
	}
}
2

Bump. There’s no documentation on this topic at all and every question I find has no definitive answer.

3

Please wait at least 4 days before bumping threads … this prevents excessive noise from being generated on the forums. Thanks.

4

Not really sure what your goal is but none of that code is necessary to load maps from pak files; just cook and package your game using the pak option on either the unreal front end, the in-editor tools or run unreal automation tool from the command line with the required flags and the cooked version of your game will have all its contents in a pak.