Question

我想直接将显示从webresponse收到的图片直接显示到浏览器而不保存到文件。我使用下面的代码将图像保存到文件但我想直接在浏览器中显示。该网站提供了webresponse中的验证码图像想要显示。请帮助我。

public void captcha(string id, string pass)
{
    HttpWebRequest req;
    HttpWebResponse response;
    string strNewValue,ckuser,ckpass;
    System.Drawing.Image returnval;
    ckuser = id;
    ckpass = pass;
    this.req = (HttpWebRequest)WebRequest.Create("http://site2sms.com/security/captcha.asp");
    ServicePointManager.Expect100Continue = false;
    this.req.CookieContainer = new CookieContainer();
    this.req.AllowAutoRedirect = false;
    this.req.UserAgent = "Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0";
    this.req.Accept = "*/*";
    this.req.Method = "POST";
    this.req.CookieContainer = cookieCntr;
    this.req.ContentType = "application/x-www-form-urlencoded";
    this.req.Referer = "http://site2sms.com/verification.asp?source=login";
    this.strNewValue = "user=" + ckuser + "&password=" + ckpass + "&Submit=Sign+in";
    this.req.ContentLength = this.strNewValue.Length;
    StreamWriter writer = new StreamWriter(this.req.GetRequestStream(), Encoding.ASCII);
    writer.Write(this.strNewValue);
    writer.Close();
    this.response = (HttpWebResponse)this.req.GetResponse();
    returnval = Image.FromStream(response.GetResponseStream());
   // returnval.Save( Server.MapPath("captcha.bmp"));
    Response.AppendHeader("Content-Disposition:", "inline;filename=captcha.bmp");
    Response.ContentType = "image/bmp";
    Response.Write(returnval);
    Response.End();
    this.response.Close();
 }

Answer 1

您可以使用HttpResponse.WriteFile方法直接将流发送到客户端。将指定文件直接写入HTTP响应输出流。
您可以创建IHttpHandler来发送流，从而避免一些页面生命周期，提高性能。 Here is the link

如何直接从asp.net中的httpwebresponse流显示图像？

1 个答案: