FromFile() public static method

Obtain credentials from a file. If the file name is not supplied the the default path of Constants.Data_DIR\credentials.json is used
public static FromFile ( string filename = null ) : CompanionAppCredentials
filename string
return CompanionAppCredentials
        private CompanionAppService()
        {
            Credentials = CompanionAppCredentials.FromFile();

            // Need to work out our current state.

            //If we're missing username and password then we need to log in again
            if (string.IsNullOrEmpty(Credentials.email) || string.IsNullOrEmpty(Credentials.password))
            {
                CurrentState = State.NEEDS_LOGIN;
            }
            else if (string.IsNullOrEmpty(Credentials.machineId) || string.IsNullOrEmpty(Credentials.machineToken))
            {
                CurrentState = State.NEEDS_LOGIN;
            }
            else
            {
                // Looks like we're ready but test it to find out
                CurrentState = State.READY;
                try
                {
                    Profile();
                }
                catch (EliteDangerousCompanionAppException ex)
                {
                    Logging.Warn("Failed to obtain profile: " + ex.ToString());
                }
            }
        }
 /// <summary>
 /// Log out of the companion API and remove local credentials
 /// </summary>
 public void Logout()
 {
     // Remove everything other than the local email address
     Credentials = CompanionAppCredentials.FromFile();
     Credentials.machineToken = null;
     Credentials.machineId    = null;
     Credentials.appId        = null;
     Credentials.password     = null;
     Credentials.ToFile();
     CurrentState = State.NEEDS_LOGIN;
 }