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Is it possible to send data from a C # application to a website or web server?

I hope someone can help me with a query that has puzzled me for ages.

Is it possible to send data from a C # application to a web page when opening a browser, for example. if you had a login form and you wanted to publish the username and password in this form from your C # application.

I see something like an open browser on the forms page and publish data to enter this page from the program, after which the page can process the form immediately, writing them and sending them to the home page. Is it possible?

Thanks in advance

Floor

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3 answers

.

- - ( -) HttpWebRequest. , URL- facebook:

internal static string FbFetch(string url)
{
    var request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "GET";
    using (var response = (HttpWebResponse)request.GetResponse())
    {
        using (var reader = new StreamReader(response.GetResponseStream()))
        {
            var responseText = reader.ReadToEnd();
            return responseText;
        }
    }
}

, , " HTML", . , UI , , , .

.

+9

HTTP- ( ), - - . , FaceBook.

    /// <summary>
    /// Create a new HttpWebRequest with the default properties for HTTP POSTS
    /// </summary>
    /// <param name="url">The URL to be posted to</param>
    /// <param name="referer">The refer</param>
    /// <param name="cookies">CookieContainer that should be used in this request</param>
    /// <param name="postData">The post data</param>
    private string CreateHttpWebUploadRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData, FileInfo fileData, string fileContentType)
    {
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        string boundary = "----------" + DateTime.UtcNow.Ticks.ToString("x", CultureInfo.InvariantCulture);

        // set the request variables
        request.Method = WebRequestMethods.Http.Post;
        request.ContentType = "multipart/form-data; boundary=" + boundary;
        request.CookieContainer = cookies;
        request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4";
        request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*";
        request.Headers.Add("Accept-Encoding: gzip,deflate");
        request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
        request.Headers.Add("Accept-Language: en-us");
        request.Referer = referer;
        request.KeepAlive = true;
        request.AllowAutoRedirect = false;

        // process through the fields
        StringBuilder sbHeader = new StringBuilder();

        // add form fields, if any
        if (postData != null)
        {
            foreach (string key in postData.AllKeys)
            {
                string[] values = postData.GetValues(key);
                if (values != null) 
                {
                    foreach (string value in values)
                    {
                        if (!string.IsNullOrEmpty(value))
                            sbHeader.AppendFormat("--{0}\r\n", boundary);
                            sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\";\r\n\r\n{1}\r\n", key, value);
                    }
                }
            }
        }

        if (fileData != null)
        {
            sbHeader.AppendFormat("--{0}\r\n", boundary);
            sbHeader.AppendFormat("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n", "media", fileData.Name);
            sbHeader.AppendFormat("Content-Type: {0}\r\n\r\n", fileContentType);
        }

        byte[] header = Encoding.UTF8.GetBytes(sbHeader.ToString());
        byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
        long contentLength = header.Length + (fileData != null ? fileData.Length : 0) + footer.Length;

        // set content length
        request.ContentLength = contentLength;

        using (Stream requestStream = request.GetRequestStream())
        {
            requestStream.Write(header, 0, header.Length);

            // write the uploaded file
            if (fileData != null)
            {
                // write the file data, if any
                byte[] buffer = new Byte[fileData.Length];
                var bytesRead = fileData.OpenRead().Read(buffer, 0, (int)(fileData.Length));
                requestStream.Write(buffer, 0, bytesRead);
            }

            // write footer
            requestStream.Write(footer, 0, footer.Length);
            requestStream.Flush();
            requestStream.Close();

            using (var response = request.GetResponse() as HttpWebResponse)
            {
                using (var stIn = new System.IO.StreamReader(response.GetResponseStream()))
                {
                    return stIn.ReadToEnd();
                }
            }
        }
    }

, . , FaceBook.

    /// <summary>
    /// Create a new HttpWebRequest with the default properties for HTTP POSTS
    /// </summary>
    /// <param name="url">The URL to be posted to</param>
    /// <param name="referer">The refer</param>
    /// <param name="cookies">CookieContainer that should be used in this request</param>
    /// <param name="postData">The post data (needs to be formatted in name=value& format</param>
    private string CreateHttpWebPostRequest(string url, string referer, CookieContainer cookies, NameValueCollection postData)
    {
        var sbPostData = new StringBuilder();

        if (postData != null)
        {
            foreach (string key in postData.AllKeys)
            {
                string[] values = postData.GetValues(key);
                if (values != null)
                {
                    foreach (string value in values)
                    {
                        if (!string.IsNullOrEmpty(value))
                            sbPostData.Append(string.Format("{0}={1}&", HttpUtility.UrlEncode(key), HttpUtility.UrlEncode(value)));
                    }
                }
            }
        }

        var parameterString = Encoding.UTF8.GetBytes(sbPostData.ToString());
        HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
        request.Method = WebRequestMethods.Http.Post;
        request.CookieContainer = cookies;
        request.ContentLength = parameterString.Length;
        request.ContentType = "application/x-www-form-urlencoded";
        request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.55 Safari/533.4";
        request.Accept = "image/gif, image/jpeg, image/pjpeg, image/pjpeg, */*";
        request.Headers.Add("Accept-Encoding: gzip,deflate");
        request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
        request.Headers.Add("Accept-Language: en-us");
        request.Referer = referer;
        request.KeepAlive = true;
        request.AllowAutoRedirect = false;

        using (Stream requestStream = request.GetRequestStream())
        {
            requestStream.Write(parameterString, 0, parameterString.Length);
            requestStream.Close();

            using (var response = request.GetResponse() as HttpWebResponse)
            {
                using (var stIn = new System.IO.StreamReader(response.GetResponseStream()))
                {
                    return stIn.ReadToEnd();
                }
            }
        }
    }
+1

You can automate web browser management directly in C #. Unlike HttpWebRequest, this will work with any site.

But if you have more money than time, consider using a commercial component .

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Source: https://habr.com/ru/post/1780946/

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