阅读来自Web服务器的图像在C＃代理

问题描述：

我想写一个代理服务器从一台服务器读取图像并将其返回到提供的HttpContext的，但我刚开字符流回来。

I am trying to write a proxy which reads an image from one server and returns it to the HttpContext supplied, but I am just getting character stream back.

我正尝试以下操作：

WebRequest req = WebRequest.Create(image);
WebResponse resp = req.GetResponse();
Stream stream = resp.GetResponseStream();
StreamReader sr = new StreamReader(stream);
StreamWriter sw = new StreamWriter (context.Response.OutputStream);

sw.Write (sr.ReadToEnd());

但正如我前面提到的，这只是文本响应。

But as I mentioned earlier, this is just responding with text.

我如何告诉它是一个形象

How do I tell it that it is an image?

编辑：我从一个网页内的源属性访问该img标签。内容类型设置为应用程序/八位字节流提示保存文件，并将其设置为图像/ JPEG只是文件名进行响应。我要的是要返回，并通过调用页面显示的图像。

I am accessing this from within a web page in the source attribute of an img tag. Setting the content type to application/octet-stream prompts to save the file and setting it to image/jpeg just responds with the filename. What I want is the image to be returned and displayed by the calling page.

答

由于您使用的二进制工作，你不不想使用的StreamReader ，这是一个文字阅读器！

Since you are working with binary, you don't want to use StreamReader, which is a TextReader!

现在，假设你已经正确设置的内容类型，你应该只使用响应流：

Now, assuming that you've set the content-type correctly, you should just use the response stream:

const int BUFFER_SIZE = 1024 * 1024;

var req = WebRequest.Create(imageUrl);
using (var resp = req.GetResponse())
{
    using (var stream = resp.GetResponseStream())
    {
        var bytes = new byte[BUFFER_SIZE];
        while (true)
        {
            var n = stream.Read(bytes, 0, BUFFER_SIZE);
            if (n == 0)
            {
                break;
            }
            context.Response.OutputStream.Write(bytes, 0, n);
        }
    }
}

阅读来自Web服务器的图像在C＃代理

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