Object reference error RSS

• • Reply
  Saeed57

  Member

  2 Points

  28 Posts

  Object reference error

  Mar 04, 2021 08:45 AM|Saeed57|LINK

  Hello,

  I'm trying to enter my Instagram account with InstagramApiSharp, but encounter  this expectation error:

  Unable to login: Object reference not set to an instance of an object.

  Do you see anything wrong with this code?

  @code{
  
      public static IInstaApi _instaApi;
  
      public static string username { get; set; }
      public static string password { get; set; }
  
      public static string message = string.Empty;
      
      public static string ExceptionMessage = string.Empty;
     
     
  
      private static async Task StartInstagram()
      {
          var userSession = new UserSessionData
          {
              UserName = "username",
              Password = "password"
          };
  
          var _instaApi = InstaApiBuilder.CreateBuilder()
      .SetUser(userSession)
      .UseLogger(new DebugLogger(LogLevel.Exceptions))
      .Build();
  
  
          const string stateFile = "state.bin";
          try
          {
              // load session file if exists
              if (File.Exists(stateFile))
              {
                  //Console.WriteLine("message = "";");
                  message = "Loading state from file";
  
                  using (var fs = File.OpenRead(stateFile))
                  {
                      _instaApi.LoadStateDataFromStream(fs);
                      
                  }
              }
          }
  
          catch (Exception e)
          {
              ExceptionMessage = $" error: {e}";
          }
          if (!_instaApi.IsUserAuthenticated)
          {
              // login
  
  
              message = $"Logging in as {userSession.UserName}";
              var logInResult = await _instaApi.LoginAsync();
              if (!logInResult.Succeeded)
              {
                  //Console.WriteLine($"Unable to login: {logInResult.Info.Message}");
                  message = $"Unable to login: {logInResult.Info.Message}";
                  return;
              }
          }
  
          // save session in file
          var state = _instaApi.GetStateDataAsStream();
          
          using (var fileStream = File.Create(stateFile))
          {
              state.Seek(0, SeekOrigin.Begin);
              state.CopyTo(fileStream);
          }
  
      }
  
  
  
  }
  

• • Reply
  PatriceSc

  All-Star

  48720 Points

  18186 Posts

  Re: Object reference error

  Mar 10, 2021 11:34 AM|PatriceSc|LINK

  Hi,

  The problem is that the error messsage seems to come from

  message = $"Unable to login: {logInResult.Info.Message}";

  So it would be an exception that happens inside the library and is returned this way which doesn't seems a good idea. You can't get the full exception to know in which internal method it happens? Seems you need to initialize something else before calling LoginAsync.