bool FDesktopPlatformBase::GetEngineIdentifierForProject(const FString& ProjectFileName, FString& OutIdentifier)
{
OutIdentifier.Empty();
// Load the project file
TSharedPtr<FJsonObject> ProjectFile = LoadProjectFile(ProjectFileName);
if(!ProjectFile.IsValid())
{
return false;
}
// Try to read the identifier from it
TSharedPtr<FJsonValue> Value = ProjectFile->TryGetField(TEXT("EngineAssociation"));
if(Value.IsValid() && Value->Type == EJson::String)
{
OutIdentifier = Value->AsString();
if(OutIdentifier.Len() > 0)
{
// If it's a path, convert it into an engine identifier
if(OutIdentifier.Contains(TEXT("/")) || OutIdentifier.Contains("\\"))
{
FString EngineRootDir = FPaths::ConvertRelativePathToFull(FPaths::GetPath(ProjectFileName), OutIdentifier);
if(!GetEngineIdentifierFromRootDir(EngineRootDir, OutIdentifier))
{
return false;
}
}
return true;
}
}
// Otherwise scan up through the directory hierarchy to find an installation
FString ParentDir = FPaths::GetPath(ProjectFileName);
FPaths::NormalizeDirectoryName(ParentDir);
// Keep going until we reach the root
int32 SeparatorIdx;
while(ParentDir.FindLastChar(TEXT('/'), SeparatorIdx))
{
ParentDir.RemoveAt(SeparatorIdx, ParentDir.Len() - SeparatorIdx);
if(IsValidRootDirectory(ParentDir) && GetEngineIdentifierFromRootDir(ParentDir, OutIdentifier))
{
return true;
}
}
// Otherwise check the engine version string for 4.0, in case this project existed before the engine association stuff went in
FString EngineVersionString = ProjectFile->GetStringField(TEXT("EngineVersion"));
if(EngineVersionString.Len() > 0)
{
FEngineVersion EngineVersion;
if(FEngineVersion::Parse(EngineVersionString, EngineVersion) && EngineVersion.HasChangelist() && EngineVersion.ToString(EVersionComponent::Minor) == TEXT("4.0"))
{
OutIdentifier = TEXT("4.0");
return true;
}
}
return false;
}
/** Migrates config files from a previous version of the engine. Does nothing on non-installed versions */
void MigratePreviousEngineInis()
{
if (!FPaths::ShouldSaveToUserDir() && !FApp::IsEngineInstalled())
{
// We can't do this in non-installed engines or where we haven't saved to a user directory
return;
}
int32 MinorVersion = GEngineVersion.GetMinor() - 1;
IPlatformFile& PlatformFile = FPlatformFileManager::Get().GetPlatformFile();
while(MinorVersion >= 0)
{
const FEngineVersion PreviousVersion(GEngineVersion.GetMajor(), MinorVersion--, 0, 0, FString());
const FString Directory = FString(FPlatformProcess::UserSettingsDir()) / ENGINE_VERSION_TEXT(EPIC_PRODUCT_IDENTIFIER) / PreviousVersion.ToString(EVersionComponent::Minor) / TEXT("Saved") / TEXT("Config") / ANSI_TO_TCHAR(FPlatformProperties::PlatformName());
if (FPaths::DirectoryExists(Directory))
{
const FString DestDir = ProjectAgnosticIniPath(TEXT(""));
if (PlatformFile.CreateDirectoryTree(*DestDir))
{
PlatformFile.CopyDirectoryTree(*DestDir, *Directory, false);
}
// If we failed to create the directory tree anyway we don't want to allow the possibility of upgrading from even older versions, so early return regardless
return;
}
}
}
