How to do download file by HttpWebRequest - It's working well so!

Question

      
Following example as to do download using HttpWebRequest instead Webclient
 //I get this information from appSetings()  -- <add key="input" value="C:\Desenvolvimento\input\D_quina.zip"/>
            string input = System.Configuration.ConfigurationManager.AppSettings["input"].ToString();

            byte[] result = null;
            byte[] buffer = new byte[4097];



            Uri uri = new Uri("http://www1.caixa.gov.br/loterias/_arquivos/loterias/D_quina.zip");

            HttpWebRequest webReq = (HttpWebRequest)HttpWebRequest.Create(uri);
            try
            {
                webReq.CookieContainer = new CookieContainer();
                webReq.Method = "GET";
                MemoryStream oMemory = new MemoryStream();

                WebResponse response = webReq.GetResponse();

                Stream stream = response.GetResponseStream();
                    
                StreamReader reader = new StreamReader(stream);

                int count = 0;

                do
                {
                    count = stream.Read(buffer, 0, buffer.Length);
                    oMemory.Write(buffer,0,count);

                    if (count == 0)
                    {
                        break;
                    }

                } while (true);

                result = oMemory.ToArray();

                FileStream ofile = new FileStream(input, FileMode.OpenOrCreate, FileAccess.ReadWrite);

                ofile.Write(result,0,result.Length);

                ofile.Close();

                oMemory.Close();
                stream.Close();
                extractFile();
                
                System.Threading.Thread.Sleep(TimeSpan.FromSeconds(5));


                System.Threading.Thread.Sleep(TimeSpan.FromSeconds(3));
                lerHtmlQuinaResult();

            }
            catch (Exception ex)
            {
                Console.Write(ex.Message);
            }
On this form I'm able to do download by url with zip file on this example.
I hope that this information can be useful.
If you want extract the zip file you can to do so:
  public static void extractFile()
        {

            // input - path where is your zip file
            // outpu - path where will be done the file extraction
            ZipFile.ExtractToDirectory(input,output);

        }
Thank you,
Edmilson

Answer 1

Para efetuar um download de uma maneira simples usando c#:

using System.Net;

WebClient webClient = new WebClient();
webClient.DownloadFile("http://mysite.com/myfile.txt", @"c:\myfile.txt");

Ou usando metodos assincronos:

private void btnDownload_Click(object sender, EventArgs e)
{
  WebClient webClient = new WebClient();
  webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
  webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
  webClient.DownloadFileAsync(new Uri("http://mysite.com/myfile.txt"), @"c:\myfile.txt");
}

private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
  progressBar.Value = e.ProgressPercentage;
}

private void Completed(object sender, AsyncCompletedEventArgs e)
{
  MessageBox.Show("Download completed!");
}

Answer 2

Olá Jean,

Obrigado pela sua resposta.

porém desta forma para download usando webclient, eu tive problemas com  várias tentativas de requisições, e mesmo usando as propriedades de quantidades máximas de solicitações configurada eu obtive o mesmo erro.

E da forma que publiquei eu obtive sucesso..

Abraço.

---

Edmilson Lopes .NET Development Specialist

Answer 3

Olá Jean,

Obrigado pela sua resposta.

porém desta forma para download usando webclient, eu tive problemas com  várias tentativas de requisições, e mesmo usando as propriedades de quantidades máximas de solicitações configurada eu obtive o mesmo erro.

E da forma que publiquei eu obtive sucesso..

Abraço.

---

Edmilson Lopes .NET Development Specialist

Qual é o erro, ?

---

Fulvio C