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Converting user IDs to strings and back

Serialize a user ID to a string value​

You can serialize a user ID to a string value by using the ToString() function on the user ID:

// TSharedPtr<const FUniqueNetId> UserId

FString UserIdSerialized = UserId->ToString();

Deserialize a string value into a user ID​

You can deserialize a string value into a user ID by using the CreateUniquePlayerId function on the identity interface:

IOnlineSubsystem *Subsystem = Online::GetSubsystem(this->GetWorld());
IOnlineIdentityPtr Identity = Subsystem->GetIdentityInterface();

// FString UserIdSerialized

TSharedPtr<const FUniqueNetId> UserId = Identity->CreateUniquePlayerId(UserIdSerialized);
if (UserId.IsValid())
{
    // User ID was deserialized successfully, but this doesn't necessarily
    // mean the user exists. If you need to check if the user exists,
    // use the IOnlineUser interface.
}