// Thread entry point
public void WorkerThread()
{
byte[] buffer = new byte[bufSize]; // buffer to read stream
while (true)
{
// reset reload event
reloadEvent.Reset();
HttpWebRequest req = null;
WebResponse resp = null;
Stream stream = null;
byte[] delimiter = null;
byte[] delimiter2 = null;
byte[] boundary = null;
int boundaryLen, delimiterLen = 0, delimiter2Len = 0;
int read, todo = 0, total = 0, pos = 0, align = 1;
int start = 0, stop = 0;
// align
// 1 = searching for image start
// 2 = searching for image end
try
{
// create request
req = (HttpWebRequest)WebRequest.Create(source);
// set login and password
if ((login != null) && (password != null) && (login != ""))
{
req.Credentials = new NetworkCredential(login, password);
}
// set connection group name
if (useSeparateConnectionGroup)
{
req.ConnectionGroupName = GetHashCode().ToString();
}
// get response
resp = req.GetResponse();
// check content type
string ct = resp.ContentType;
if (ct.IndexOf("multipart/x-mixed-replace") == -1)
{
throw new ApplicationException("Invalid URL");
}
// get boundary
ASCIIEncoding encoding = new ASCIIEncoding();
boundary = encoding.GetBytes(ct.Substring(ct.IndexOf("boundary=", 0) + 9));
boundaryLen = boundary.Length;
// get response stream
stream = resp.GetResponseStream();
// loop
while ((!stopEvent.WaitOne(0, true)) && (!reloadEvent.WaitOne(0, true)))
{
// check total read
if (total > bufSize - readSize)
{
total = pos = todo = 0;
}
// read next portion from stream
if ((read = stream.Read(buffer, total, readSize)) == 0)
{
throw new ApplicationException();
}
total += read;
todo += read;
// increment received bytes counter
bytesReceived += read;
// does we know the delimiter ?
if (delimiter == null)
{
// find boundary
pos = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (pos == -1)
{
// was not found
todo = boundaryLen - 1;
pos = total - todo;
continue;
}
todo = total - pos;
if (todo < 2)
{
continue;
}
// check new line delimiter type
if (buffer[pos + boundaryLen] == 10)
{
delimiterLen = 2;
delimiter = new byte[2] {
10, 10
};
delimiter2Len = 1;
delimiter2 = new byte[1] {
10
};
}
else
{
delimiterLen = 4;
delimiter = new byte[4] {
13, 10, 13, 10
};
delimiter2Len = 2;
delimiter2 = new byte[2] {
13, 10
};
}
pos += boundaryLen + delimiter2Len;
todo = total - pos;
}
// search for image
if (align == 1)
{
start = ByteArrayUtils.Find(buffer, delimiter, pos, todo);
if (start != -1)
{
// found delimiter
start += delimiterLen;
pos = start;
todo = total - pos;
align = 2;
}
else
{
// delimiter not found
todo = delimiterLen - 1;
pos = total - todo;
}
}
// search for image end
while ((align == 2) && (todo >= boundaryLen))
{
stop = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (stop != -1)
{
pos = stop;
todo = total - pos;
// increment frames counter
framesReceived++;
// image at stop
if (NewFrame != null)
{
Bitmap bmp = (Bitmap)Bitmap.FromStream(new MemoryStream(buffer, start, stop - start));
// notify client
NewFrame(this, new CameraEventArgs(bmp));
// release the image
bmp.Dispose();
bmp = null;
}
// shift array
pos = stop + boundaryLen;
todo = total - pos;
Array.Copy(buffer, pos, buffer, 0, todo);
total = todo;
pos = 0;
align = 1;
}
else
{
// delimiter not found
todo = boundaryLen - 1;
pos = total - todo;
}
}
}
}
catch (WebException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// wait for a while before the next try
Thread.Sleep(250);
}
catch (ApplicationException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// wait for a while before the next try
Thread.Sleep(250);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
}
finally
{
// abort request
if (req != null)
{
req.Abort();
req = null;
}
// close response stream
if (stream != null)
{
stream.Close();
stream = null;
}
// close response
if (resp != null)
{
resp.Close();
resp = null;
}
}
// need to stop ?
if (stopEvent.WaitOne(0, true))
{
break;
}
}
}
// 线程入口
public void WorkerThread()
{
byte[] buffer = new byte[bufSize]; // buffer 用于读取流
while (true)
{
// 重置reload事件
reloadEvent.Reset();
HttpWebRequest req = null;
WebResponse resp = null;
Stream stream = null;
byte[] delimiter = null;
byte[] delimiter2 = null;
byte[] boundary = null;
int boundaryLen, delimiterLen = 0, delimiter2Len = 0;
int read, todo = 0, total = 0, pos = 0, align = 1;
int start = 0, stop = 0;
// 排序
// 1 = 查询图片的开始
// 2 = 查询图片的结束
try
{
// 创建请求
req = (HttpWebRequest)WebRequest.Create(source);
// 设置用户名和密码
if ((login != null) && (password != null) && (login != ""))
{
req.Credentials = new NetworkCredential(login, password);
}
// 设置连接组名
if (useSeparateConnectionGroup)
{
req.ConnectionGroupName = GetHashCode().ToString();
}
// 获取响应
resp = req.GetResponse();
// 检查内容类型
string ct = resp.ContentType;
if (ct.IndexOf("multipart/x-mixed-replace") == -1)
{
throw new ApplicationException("Invalid URL");
}
// 获取分界
ASCIIEncoding encoding = new ASCIIEncoding();
boundary = encoding.GetBytes(ct.Substring(ct.IndexOf("boundary=", 0) + 9));
boundaryLen = boundary.Length;
// 获取响应流
stream = resp.GetResponseStream();
// 循环
while ((!stopEvent.WaitOne(0, true)) && (!reloadEvent.WaitOne(0, true)))
{
if (total > bufSize - readSize)
{
total = pos = todo = 0;
}
// 读取流的下一部分
if ((read = stream.Read(buffer, total, readSize)) == 0)
{
throw new ApplicationException();
}
total += read;
todo += read;
// increment received bytes counter
bytesReceived += read;
if (delimiter == null)
{
// 找到边界
pos = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (pos == -1)
{
// 没有找到
todo = boundaryLen - 1;
pos = total - todo;
continue;
}
todo = total - pos;
if (todo < 2)
{
continue;
}
if (buffer[pos + boundaryLen] == 10)
{
delimiterLen = 2;
delimiter = new byte[2] {
10, 10
};
delimiter2Len = 1;
delimiter2 = new byte[1] {
10
};
}
else
{
delimiterLen = 4;
delimiter = new byte[4] {
13, 10, 13, 10
};
delimiter2Len = 2;
delimiter2 = new byte[2] {
13, 10
};
}
pos += boundaryLen + delimiter2Len;
todo = total - pos;
}
// 查询图片头
if (align == 1)
{
start = ByteArrayUtils.Find(buffer, delimiter, pos, todo);
if (start != -1)
{
// 找到delimiter
start += delimiterLen;
pos = start;
todo = total - pos;
align = 2;
}
else
{
// delimiter没有找到
todo = delimiterLen - 1;
pos = total - todo;
}
}
// 查询图片尾
while ((align == 2) && (todo >= boundaryLen))
{
stop = ByteArrayUtils.Find(buffer, boundary, pos, todo);
if (stop != -1)
{
pos = stop;
todo = total - pos;
// 帧计数器增加
framesReceived++;
// 产生新帧事件
if (NewFrame != null)
{
Bitmap bmp = (Bitmap)Bitmap.FromStream(new MemoryStream(buffer, start, stop - start));
// 通知上层，新帧事件
NewFrame(this, new CameraEventArgs(bmp));
// 释放图片
bmp.Dispose();
bmp = null;
}
// 转移数组
pos = stop + boundaryLen;
todo = total - pos;
Array.Copy(buffer, pos, buffer, 0, todo);
total = todo;
pos = 0;
align = 1;
}
else
{
// delimiter没有找到
todo = boundaryLen - 1;
pos = total - todo;
}
}
}
}
catch (WebException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// 等待再一次尝试
Thread.Sleep(250);
}
catch (ApplicationException ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
// 等待再一次尝试
Thread.Sleep(250);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("=============: " + ex.Message);
}
finally
{
// 终止请求
if (req != null)
{
req.Abort();
req = null;
}
// 关闭响应流
if (stream != null)
{
stream.Close();
stream = null;
}
// 关闭响应
if (resp != null)
{
resp.Close();
resp = null;
}
}
if (stopEvent.WaitOne(0, true))
{
break;
}
}
}
