我有以下代码不起作用。我的camUrl
如果我加载到 Firefox 并从我的摄像头进行流传输,则链接有效,但在运行时我的图片框中没有显示任何内容。有什么想法吗?
public Thread _camThread;
private string camUrl = "http://my-domain-ip:2080/videostream.cgi?user=admin&pwd=password";
public HttpWebRequest webReq;
public WebResponse webRes;
public Stream sr;
private void btnStart_Click(object sender, EventArgs e)
{
if (_camThread == null) _camThread = new Thread(new ThreadStart(RunCam));
_camThread.Start();
}
private void RunCam()
{
try
{
webReq = (HttpWebRequest)WebRequest.Create(camUrl);
webReq.AllowWriteStreamBuffering = true;
webReq.Timeout = 20000;
using (webRes = webReq.GetResponse())
{
while ((sr = webRes.GetResponseStream()) != null)
{
image.Image = Image.FromStream(sr);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void btnStop_Click(object sender, EventArgs e)
{
if (_camThread.IsAlive)
{
_camThread.Abort();
_camThread = null;
}
}
看来您从响应流中读取的循环不正确。您只能从响应中获得一个流,并且其中将包含多个图像。
您可能无法直接将响应流传递给 Image.FromStream - 图像可能以多部分响应进行编码,该多部分响应用文本分隔符分隔图像。您可以在以下位置了解有关多部分响应格式的更多信息:RFC2046.
using (webRes = webReq.GetResponse())
{
using (sr = webRes.GetResponseStream())
{
// continuously read images from the response stream until error
while (true)
{
try
{
// note: the line below probably won't work, you may need to parse
// the next image from the multi-part response stream manually
image.Image = Image.FromStream(sr);
// if the above doesn't work, then do something like this:
// var imageBytes = ParseNextImage(sr);
// var memoryStream = new MemoryStream(imageBytes);
// image.Image = Image.FromStream(memoryStream);
}
catch(Exception e)
{
Console.WriteLine("Aborting read from response stream due to error {0}", e);
break;
}
}
}
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)