Google ReCaptcha答案 [英] Google ReCaptcha Answer

问题描述

你好，

我有用于从谷歌创建recaptcha图像的代码：

I have that code for creating a recaptcha image from google:

public Image CreateRecaptcha(string key, ref string challenge)
        {
            try
            {
                WebClient client = new WebClient();
                string response = client.DownloadString(string.Format("http://api.recaptcha.net/challenge?k={0}", key));

                Match match = Regex.Match(response, "challenge : '(.+?)'");

                if (match.Captures.Count == 0)
                {
                    challenge = null;
                    return null;
                }

                challenge = match.Groups[1].Value;
                if (File.Exists("captcha.jpg")) File.Delete("captcha.jpg");
                client.DownloadFile(string.Format("http://www.google.com/recaptcha/api/image?c={0}", challenge),
                                    "captcha.jpg");
                Thread.Sleep(150);
                return Image.FromFile("captcha.jpg");

            }
            catch (Exception)
            {
                challenge = null;
                return null;
            }
        }

工作正常，我得到图像。

我唯一需要的是获取字符串图像的答案（出现在其上的文字）。

有人可以帮助我从这种方法中得到答案吗？
b $ b我认为这与'挑战'有关和'关键'，但我无法找到该怎么做。

It is working fine and I get the image.
The only thing I need is to get the string with the answer for the image (the text that appears on it).
Can someone help me getting the answer from that method?
I believe it's related to the 'challenge' and 'key' but I just couldn't find what to do with it.

推荐答案

虽然
以下适用于ASP.NET，您仍然可以从中学习。

Although the following is for ASP.NET you can still learn from it.

using Newtonsoft.Json;

public class ReCaptchaClass
{
    public static string Validate(string EncodedResponse)
    {
        var client = new System.Net.WebClient();

        string PrivateKey = "6LcH-v8SerfgAPlLLffghrITSL9xM7XLrz8aeory";

        var GoogleReply = client.DownloadString(string.Format("https://www.google.com/recaptcha/api/siteverify?secret={0}&response={1}", PrivateKey, EncodedResponse));

        var captchaResponse = Newtonsoft.Json.JsonConvert.DeserializeObject<ReCaptchaClass>(GoogleReply);

        return captchaResponse.Success;
    }

    [JsonProperty("success")]
    public string Success
    {
        get { return m_Success; }
        set { m_Success = value; }
    }

    private string m_Success;
    [JsonProperty("error-codes")]
    public List<string> ErrorCodes
    {
        get { return m_ErrorCodes; }
        set { m_ErrorCodes = value; }
    }


    private List<string> m_ErrorCodes;
}

这篇关于Google ReCaptcha答案的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！