如图 通过http 下载某个东西 , WebResponse response = request.GetResponse(); response 调试如图
ContentLength 为0 但Content-Range 是有值的 导致下载的视频是0字节
修改后的代码:
public static int GetTotalSize(string url)
{
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
request.CookieContainer = BaseService.CookiesContainer;
WebResponse response = request.GetResponse();
int len = Int32.Parse(response.Headers["Content-Range"].ToString().Split(new char[] { '/' })[1]);
return len;
} public static byte[] SendRangeGetRequest(string url)
{
try
{
int len = GetTotalSize(url);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "get";
request.AddRange("bytes", 0, len); //这部是关键 加上它,response 的ContentLength 就有值了 if (CookiesContainer == null)
{
CookiesContainer = new CookieContainer();
} request.CookieContainer = CookiesContainer; //启用cookie HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream response_stream = response.GetResponseStream(); int count = (int)response.ContentLength;
int offset = 0;
byte[] buf = new byte[count];
while (count > 0) //读取返回数据
{
int n = response_stream.Read(buf, offset, count);
if (n == 0) break;
count -= n;
offset += n;
}
return buf;
}
catch
{
return null;
}
}
最后 File.WriteAllBytes(savePath, bytes); 就能下载到本地了