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Windows 10 future version - October 2017 Update
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Samples/BackgroundTransfer/Server/website/randomAccess.aspx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| <%@ Page Language="C#" AutoEventWireup="true" Debug="true" %> | ||
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> | ||
|
|
||
| <script runat="server"> | ||
| private static void GetRange(uint fullContentLengthInBytes, string rangeHeaderValue, out uint offset, out uint lengthInBytes) | ||
| { | ||
| offset = 0; | ||
| lengthInBytes = fullContentLengthInBytes; | ||
| if (String.IsNullOrEmpty(rangeHeaderValue)) | ||
| { | ||
| return; | ||
| } | ||
| Regex rx = new Regex(@"(bytes)\s*=\s*(?<startIndex>\d+)\s*-\s*(?<endIndex>\d+)?", RegexOptions.Compiled | RegexOptions.IgnoreCase); | ||
| Match match = rx.Match(rangeHeaderValue); | ||
| uint startIndex = 0; | ||
| Capture startIndexCapture = match.Groups["startIndex"]; | ||
| if ((startIndexCapture == null) || (!UInt32.TryParse(startIndexCapture.Value, out startIndex))) | ||
| { | ||
| return; | ||
| } | ||
| if (startIndex < 0 || startIndex >= fullContentLengthInBytes) | ||
| { | ||
| throw new ArgumentException( | ||
| "Requested range starting index is negative or goes beyond the file's length"); | ||
| } | ||
| offset = startIndex; | ||
| uint endIndex = 0; | ||
| Capture endIndexCapture = match.Groups["endIndex"]; | ||
| if ((endIndexCapture != null) && (UInt32.TryParse(endIndexCapture.Value, out endIndex))) | ||
| { | ||
| if (endIndex < startIndex) | ||
| { | ||
| throw new ArgumentException( | ||
| "Requested range ending index is less than the starting index"); | ||
| } | ||
| lengthInBytes = Math.Min(endIndex, fullContentLengthInBytes - 1) - offset + 1; | ||
| } | ||
| else | ||
| { | ||
| lengthInBytes = fullContentLengthInBytes - offset; | ||
| } | ||
| } | ||
| protected void Page_Load(object sender, EventArgs e) | ||
| { | ||
| try | ||
| { | ||
| uint fullContentLengthInBytes = 100000000; // 100 MB | ||
| if (Request["length"] != null) | ||
| { | ||
| fullContentLengthInBytes = UInt32.Parse(Request["length"]); | ||
| } | ||
| int bytesPerSec = 1000000; // 1 MB/s | ||
| if (Request["bytesPerSec"] != null) | ||
| { | ||
| bytesPerSec = Int32.Parse(Request["bytesPerSec"]); | ||
| if (bytesPerSec <= 0) | ||
| { | ||
| throw new ArgumentException("bytesPerSec cannot be zero or negative"); | ||
| } | ||
| } | ||
| uint offset = 0; | ||
| uint contentLengthInBytes = fullContentLengthInBytes; | ||
| // Check if we have a request for partial content (resume scenarios). | ||
| if (Request.Headers["Range"] != null) | ||
| { | ||
| GetRange(fullContentLengthInBytes, Request.Headers["Range"], out offset, out contentLengthInBytes); | ||
| } | ||
| if (contentLengthInBytes != fullContentLengthInBytes) | ||
| { | ||
| Response.StatusCode = 206; | ||
| Response.Headers["Content-Range"] = String.Format(System.Globalization.CultureInfo.InvariantCulture, | ||
| "bytes {0}-{1}/{2}", offset, offset + contentLengthInBytes - 1, fullContentLengthInBytes); | ||
| } | ||
| else | ||
| { | ||
| Response.StatusCode = 200; | ||
| } | ||
| Response.ContentType = "text/plain"; | ||
| Response.Headers["Content-Length"] = contentLengthInBytes.ToString(System.Globalization.CultureInfo.InvariantCulture); | ||
| Response.Headers["Accept-Ranges"] = "bytes"; | ||
| Response.Headers["Last-Modified"] = "Thu, 21 Aug 2014 21:34:57 GMT"; | ||
| Response.Buffer = false; | ||
| uint transferLengthInBytes = contentLengthInBytes; | ||
| byte[] buffer = Encoding.ASCII.GetBytes(new String('a', bytesPerSec)); | ||
| while (transferLengthInBytes > 0) | ||
| { | ||
| System.Threading.Thread.Sleep(1000); | ||
| int sendLengthInBytes = (int)Math.Min(transferLengthInBytes, buffer.Length); | ||
| Response.OutputStream.Write(buffer, 0, sendLengthInBytes); | ||
| transferLengthInBytes -= (uint)sendLengthInBytes; | ||
| } | ||
| Response.Flush(); | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| Trace.Write(ex.Message); | ||
| Response.StatusCode = 500; | ||
| Response.StatusDescription = ex.Message; | ||
| } | ||
| Response.End(); | ||
| } | ||
| </script> | ||
|
|
||
| <html xmlns="http://www.w3.org/1999/xhtml"> | ||
| <head runat="server"> | ||
| <title>Random Access Download</title> | ||
| </head> | ||
| <body> | ||
| Hello | ||
| </body> | ||
| </html> |
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