Getting unable to cast the object of filecontectresult to string in kendo captcha

[Babu]

Hi,

 

I am trying to implement Kendo Captcha. I tried to implement same way as in this article.

ASP.NET MVC Captcha Component Validation - Telerik UI for ASP.NET MVC

But I am getting below error. what am I doing wrong?

 

 

My code is like this

 

@(Html.Kendo().Captcha()
                            .Name("Captcha")
                            .CaptchaImage((string)ViewData["Captcha"])
                            .CaptchaId((string)ViewData["CaptchaID"])
                            .DataCaptchaField("Captcha") // The field containing the Captcha from the server-side should be called Captcha.
                            .DataCaptchaIdField("CaptchaID") // The field containing the Captcha's ID from the server-side should be called CaptchaID.
                            .Handler(handler => handler.Action("Reset", "IUA"))
                            .ValidationHandler(handler => handler.Action("Validate", "IUA"))
                            .ValidateOnBlur(true)
                        )

namespace Portal.Controllers
{
    public class IuaController : Controller
    {
        // GET: Iua
        public ActionResult Index ( string pin )
        {
            var model = portalServices.getExistingData();


            if (string.IsNullOrEmpty(model.CaptchaID))
            {
                GenerateNewCaptcha();
            }
            else
            {
                CaptchaImage captchaImage = (CaptchaImage)Session["captcha" + model.CaptchaID];

                if (captchaImage != null && CaptchaHelper.Validate(captchaImage, model.Captcha.ToUpperInvariant()))
                {
                    ModelState.Clear();
                    GenerateNewCaptcha();
                }
            }

            //return View();

            return View(model);
        }

        private void GenerateNewCaptcha()
        {
            CaptchaImage captchaImage = CaptchaHelper.GetNewCaptcha();

            Session["captcha" + captchaImage.UniqueId] = captchaImage;

            ViewData["Captcha"] = GetCatchaImage(captchaImage.UniqueId);//Url.Action("image", "IUA", new { captchaId = captchaImage.UniqueId });
            ViewData["CaptchaID"] = captchaImage.UniqueId;
        }

        public ActionResult Reset()
        {
            CaptchaImage newCaptcha = CaptchaHelper.GetNewCaptcha();

            Session["captcha" + newCaptcha.UniqueId] = newCaptcha;

            return Json(new
            {
                captcha = GetCatchaImage(newCaptcha.UniqueId),//Url.Action("image", "IUA", new { captchaId = newCaptcha.UniqueId }),
                captchaId = newCaptcha.UniqueId
            }, JsonRequestBehavior.AllowGet);
        }

        public ActionResult Image(string captchaId)
        {
            CaptchaImage captcha = (CaptchaImage)Session["captcha" + captchaId];
            var image = CaptchaHelper.RenderCaptcha(captcha);
            byte[] bmpBytes;

            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Png);
                bmpBytes = ms.ToArray();
            }

            return File(bmpBytes, "image/png");
        }

        public ActionResult GetCatchaImage(string captchaId)
        {
            CaptchaImage captcha = (CaptchaImage)Session["captcha" + captchaId];
            var image = CaptchaHelper.RenderCaptcha(captcha);
            byte[] bmpBytes;

            using (MemoryStream ms = new MemoryStream())
            {
                image.Save(ms, ImageFormat.Png);
                bmpBytes = ms.ToArray();
            }

            return File(bmpBytes, "image/png");
        }

        public ActionResult Audio(string captchaId)
        {
            CaptchaImage captcha = (CaptchaImage)Session["captcha" + captchaId];
            byte[] bmpBytes;

            using (MemoryStream audio = CaptchaHelper.SpeakText(captcha))
            {
                bmpBytes = audio.ToArray();
            }

            return File(bmpBytes, "audio/wav");
        }

        public ActionResult Validate(string captchaId, string captcha)
        {
            CaptchaImage captchaImage = (CaptchaImage)Session["captcha" + captchaId];

            return Json(CaptchaHelper.Validate(captchaImage, captcha.ToUpperInvariant()), JsonRequestBehavior.AllowGet);
        }
    }
}

Model class

    public class IuaModel
    {
        [Key]
        public string Pin { get; set; }

        [Display(Name = "Ticket #")]
        public long Id { get; set; }

        [Required]
        [Display(Name = "First Name")]
        public string FirstName { get; set; }

        [Display(Name = "Middle Initial")]
        public string MiddleInitial { get; set; }

        [Required]
        [Display(Name = "Last Name")]
        public string LastName { get; set; }

        [Display(Name = "Facility Name")]
        public string FacilityName { get; set; }

        private string _captchaValue;

        public string Captcha
        {
            get
            {
                return string.IsNullOrEmpty(_captchaValue) ? "" : _captchaValue;
            }
            set
            {
                _captchaValue = value;
            }
        }

        public string CaptchaID { get; set; }
    }

[Babu]

anyone know what the mistake I am doing?

[Babu]

I tried all the ways i know but no luck . can anyone help me in this issue?

[Anton Mironov]

Hi Babu,

Thank you for the code snippets and details provided.

I don't see anything problematic in the configuration you posted as it follows the documentation. I've attached a sample project in which a Captcha is initialized and the audio is working as expected. There must be a difference between this project and yours if the audio in your project doesn't work.

I would suggest checking for:

1. JavaScript errors in the browser's Developer Tools Console
2. Verify in the browser's dev tools Network tab that the request to the Audio action is successful.
3. Check if all of the Kendo client-side resources that are referenced in the _Layout.cshtml are using the same 2023.1.117 version. The Kendo.Mvc.dll referenced in the project should also use the same version.
4. Ensure that jQuery is not loaded twice in the _Layout.cshtml

If everything looks ok and you are unable to find any significant difference between the attached project and yours - send me a runnable sample of your application and I will try my best to fix it.

Looking forward to your reply.

 

Kind Regards,
Anton Mironov
Progress Telerik