Description of the problem, directly Figure
The test code
public void test()
{
//string url = "https://ssl.ptlogin2.qq.com/ptqrshow?appid=501004106&e=0&l=M&s=5&d=72&v=4&t=#{t}";
//url = url.Replace("#{t}", rand.NextDouble().ToString());
HttpWebRequest req = (HttpWebRequest)WebRequest.Create("https://ssl.ptlogin2.qq.com/ptqrshow?appid=501004106&e=0&l=M&s=5&d=72&v=4&t=#{t}".Replace("#{t}", rand.NextDouble().ToString()));
//HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
//req.Method = "get";
req.CookieContainer = BLL.SmartQQ.Tool.Http.cookies;
HttpWebResponse res = (HttpWebResponse)req.GetResponse();
BLL.SmartQQ.Tool.Http.cookies.Add(res.Cookies);
Stream responseStream = res.GetResponseStream();
//int contentLength = (int)res.ContentLength;
//int offset = 0;
//byte[] buffer = new byte[contentLength];
//while (contentLength > 0)
//{
// int num3 = responseStream.Read(buffer, offset, contentLength);
// if (num3 == 0)
// {
// break;
// }
// contentLength -= num3;
// offset += num3;
//}
//pictureBoxQRCode.Image = Image.FromStream(new MemoryStream(buffer));
pictureBoxQRCode.Image = Image.FromStream(res.GetResponseStream());
//pictureBoxQRCode.Image = Image.FromStream(responseStream);
}res.GetResponseStream () reads the stream, when the stream is not read many times to do the operation, the default can only be read once
After reading again using res.GetResponseStream () reads the stream, then the code will burst abnormal
