我有一个Jpegs图像流，我正在尝试使用HTTP流式传输到VLC
以下代码：
public HttpListenerResponse StartListening(String where)
{
listener = new HttpListener();
listener.Start();
Console.WriteLine("listening on " + where);
listener.Prefixes.Add(where);
HttpListenerContext context = listener.GetContext();
HttpListenerRequest request = context.Request;
// Obtain a response object.
HttpListenerResponse response = context.Response;
return response;
}
public void StartStream()
{
HttpListenerResponse response = StartListening("http://localhost:8080/");
MemoryStream mem = null;
for (;;)
{
Bitmap b = generateBitmap();
//pictureBox1.Image = frm.GetFormImage();
byte[] ar = BitmapToArray(b);
// Construct a response.
byte[] buffer = ar;
response.ContentType = "multipart/x-mixed-replace; boundary=--testboundary";
ASCIIEncoding ae = new ASCIIEncoding();
byte[] boundary = ae.GetBytes("\r\n--testboundary\r\nContent-Type: image/jpeg\r\nContent-Length:" + buffer.Length + "\r\n\r\n");
mem = new MemoryStream(boundary);
mem.WriteTo(response.OutputStream);
mem = new MemoryStream(buffer);
mem.WriteTo(response.OutputStream);
}
mem.Close();
listener.Stop();
}
出于某种原因，如果我尝试在firefox中打开流，它会全部变回黑色，如果我尝试用VLC打开它，我会得到“无法打开流”
如果我只流1个图像，firefox处理它没有问题。
事先提前， 何
答案 0 :(得分：3)
您可以尝试提供多部分范围请求。 VLC可能正在以“块”请求数据，但您的HTTPHandler未提供该功能。下面是一些（冗长的）示例代码。尝试将音乐流式传输到iPod Touch时，我遇到了类似的问题。像浏览器中的魅力一样工作，但没有与Touch一起工作。事实证明，iPod通过对我的处理程序的多个请求请求byte []块，但处理程序没有实现它所需的功能。
我在这里混合了一些自己的库类，但是你会很好地了解它。
public abstract class MultipartRangeHandler : IHttpHandler
{
protected const String HEADER_RANGE = "range";
protected const String HEADER_CONTENT_TYPE = "Content-Type";
protected const String HEADER_CONTENT_LENGTH = "Content-Length: ";
protected const String HEADER_CONTENT_DISPOSITION = "Content-Disposition";
protected const String HEADER_CONTENT_RANGE = "Content-Range";
protected const String HEADER_BOUNDARY_DELIMETER = "--";
protected const String HEADER_STATUS_PARTIAL_CONTENT = "Partial Content";
private const char COMMA = ',';
private const char EQUALS = '=';
private const char NEW_LINE = '\n';
protected const String QS_OBJECT_ID = "cid";
public void ProcessRequest(HttpContext context)
{
if (StringUtils.isNullOrEmpty(context.Request.QueryString[QS_OBJECT_ID]))
{
sendResponse(400, "400 Bad Request", "No resource was specified in the query string to retrieve.", context);
}
else
{
ContentItem contentItem = getContentItem(context.Request.QueryString[QS_OBJECT_ID]);
if (contentItem != null)
{
context.Response.Clear();
context.Response.ClearHeaders();
context.Response.ClearContent();
if (context.Request.Headers[HEADER_RANGE] != null)
{
string range = context.Request.Headers[HEADER_RANGE];
range = range.Substring(range.LastIndexOf(EQUALS) + 1);
bool isMultipartRange = range.Contains(COMMA.ToString());
if (!isMultipartRange)
{
addHeader(context.Response, HEADER_CONTENT_TYPE, contentItem.MimeType);
addHeader(context.Response, HEADER_CONTENT_DISPOSITION, "inline; filename=\"" + contentItem.Filename + "\"");
string[] startEnd = range.Split('-');
long startPos;
long.TryParse(startEnd[0], out startPos);
long endPos;
int fileSize = contentItem.FileBytes.Length;
if (startEnd.GetUpperBound(0) >= 1 && startEnd[1] != String.Empty)
{
long.TryParse(startEnd[1], out endPos);
}
else
{
endPos = fileSize - startPos;
}
if (endPos > fileSize)
{
endPos = fileSize - startPos;
}
context.Response.StatusCode = 206;
context.Response.StatusDescription = HEADER_STATUS_PARTIAL_CONTENT;
addHeader(context.Response, HEADER_CONTENT_RANGE, "bytes " + startPos + "-" + endPos + "/" + fileSize);
context.Response.BinaryWrite(ByteUtils.subByte(contentItem.FileBytes, (int)startPos, (int)(endPos - startPos) + 1));
}
else
{
string boundary = "waynehartmanansmach";
addHeader(context.Response, HEADER_CONTENT_TYPE, "multipart/byteranges; boundary=" + boundary);
List<string[]> ranges = new List<string[]>();
string[] multiRange = range.Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);
foreach (string mr in multiRange)
{
ranges.Add(mr.Split(new string[] { "-" }, StringSplitOptions.RemoveEmptyEntries));
}
// process the list of ranges
foreach (string[] rangeArray in ranges.ToArray())
{
context.Response.Write(HEADER_BOUNDARY_DELIMETER + boundary + NEW_LINE);
context.Response.Write(HEADER_CONTENT_TYPE + ": " + contentItem.MimeType + NEW_LINE);
context.Response.Write(HEADER_CONTENT_RANGE + ": bytes " + rangeArray[0] + "-" + rangeArray[1] + "/" + contentItem.FileBytes + NEW_LINE + NEW_LINE);
long startPos = long.Parse(rangeArray[0]);
long endPos = long.Parse(rangeArray[1]);
context.Response.BinaryWrite(ByteUtils.subByte(contentItem.FileBytes, (int)startPos, (int)(endPos - startPos) + 1));
context.Response.Write(NEW_LINE);
context.Response.Flush();
}
context.Response.Write(HEADER_BOUNDARY_DELIMETER + boundary + HEADER_BOUNDARY_DELIMETER + NEW_LINE + NEW_LINE);
}
}
else
{
context.Response.ContentType = contentItem.MimeType;
addHeader(context.Response, HEADER_CONTENT_DISPOSITION, "attachment; filename=\"" + contentItem.Filename + "\"");
addHeader(context.Response, HEADER_CONTENT_LENGTH, contentItem.FileBytes.Length.ToString());
context.Response.OutputStream.Write(contentItem.FileBytes, 0, contentItem.FileBytes.Length);
}
}
else
{
sendResponse(404, "404 Not Found", "The resource requested does not exist.", context);
}
}
}
private void sendResponse(int statusCode, String status, String statusMessage, HttpContext context)
{
System.Text.StringBuilder data = new System.Text.StringBuilder();
data.AppendLine("<html><body>");
data.AppendLine("<h1>"+status+"</h1>");
data.AppendLine("<p>"+statusMessage+"</p>");
data.AppendLine("</body></html>");
byte[] headerData = System.Text.Encoding.ASCII.GetBytes(data.ToString());
context.Response.ContentType = "text/html";
context.Response.StatusCode = statusCode;
context.Response.Status = status;
addHeader(context.Response, HEADER_CONTENT_LENGTH, headerData.Length.ToString());
//context.Response.AddHeader("Content-Length: ", headerData.Length.ToString());
context.Response.OutputStream.Write(headerData, 0, headerData.Length);
context.Response.End();
}
protected void addHeader(HttpResponse response, String key, String value)
{
response.AddHeader(key, value);
}
protected abstract com.waynehartman.util.web.handlers.multipartrange.ContentItem getContentItem(String objectID);
public bool IsReusable
{
get { return true; }
}
}
答案 1 :(得分：0)
设置前缀然后调用Start()。
从我在代码和其他地方看到的内容来看，您无法使用HttpListener来传输数据。 您可能必须将请求转发到另一个将数据写回的本地TCP套接字。