StreamWriter输出BaseStream优先

本文关键字：优先 BaseStream 输出 StreamWriter | 更新日期: 2023-09-27 18:26:17

我有下面的SimpleHttp服务器代码：

   using (Stream fs = File.Open(@"C:'Users'Mohamed'Desktop'Hany.jpg", FileMode.Open))
            {
                StreamWriter OutputStream = new StreamWriter(new BufferedStream(someSocket.GetStream()));
                OutputStream.WriteLine("HTTP/1.0 200 OK");
                OutputStream.WriteLine("Content-Type: application/octet-stream");
                OutputStream.WriteLine("Content-Disposition: attachment; filename=Hany.jpg");
                OutputStream.WriteLine("Content-Length: " + img.Length);
                OutputStream.WriteLine("Connection: close");
                OutputStream.WriteLine(""); // this terminates the HTTP headers
                fs.CopyTo(OutputStream.BaseStream);
                OutputStream.Flush();
                //OutputStream.BaseStream.Flush();
            }

问题是，当我看到输出http响应时，标头在文本的末尾，BaseStream中的图像二进制文件甚至在标头之前就出现在第一位。输出的示例是（当然我删除了图像的长字节）：

    ä3ST)ëî!ðDFYLQ>qâ:oÂÀó?ÿÙHTTP/1.0 200 OK
    Content-Type: image/png
    Connection: close

我想要的是颠倒顺序，把标题放在上面，得到的是这样的东西：

    HTTP/1.0 200 OK
    Content-Type: image/png
    Connection: close
    ä3ST)ëî!ðDFYLQ>qâ:oÂÀó?ÿÙT4ñ®KÛ'`ÃGKs'CGÔ«¾+L»ê±?0Íse3rïÁå·>"ܼ;®N¦Ãõ5¨LZµL¯

在流写入程序或BaseStream上使用flush并不重要。任何帮助！

StreamWriter输出BaseStream优先

我认为问题是由对CopyTo的调用和传递BaseStream引起的。它可能会绕过尚未刷新数据的StreamWriter。

BaseStream不应用于写入。必须使用StreamWriter。

using (StreamWriter outputStream = new StreamWriter(new BufferedStream(someSocket.GetStream())))
 {
    outputStream.WriteLine("HTTP/1.0 200 OK");
    outputStream.WriteLine("Content-Type: application/octet-stream");
    outputStream.WriteLine("Content-Disposition: attachment; filename=Hany.jpg");
    outputStream.WriteLine("Content-Length: " + img.Length);
    outputStream.WriteLine("Connection: close");
    outputStream.WriteLine(""); // this terminates the HTTP headers
    string imageContent = Convert.ToBase64String(File.ReadAllBytes(@"C:'Users'Mohamed'Desktop'Hany.jpg"));
    outputStream.Write(imageContent);
    outputStream.Flush();
}

谢谢Kzrystof，我接受了你的提示，现在它可以在使用copyTo之前刷新StreamWriter，但我真的不知道这样做是否正确？你觉得怎么样？

  using (Stream fs = File.Open(@"C:'Users'Mohamed'Desktop'Hany.jpg", FileMode.Open))
        {
            StreamWriter OutputStream = new StreamWriter(new BufferedStream(someSocket.GetStream()));
            OutputStream.WriteLine("HTTP/1.0 200 OK");
            OutputStream.WriteLine("Content-Type: application/octet-stream");
            OutputStream.WriteLine("Content-Disposition: attachment; filename=Hany.jpg");
            OutputStream.WriteLine("Content-Length: " + img.Length);
            OutputStream.WriteLine("Connection: close");
            OutputStream.WriteLine(""); // this terminates the HTTP headers
            OutputStream.Flush();
            fs.CopyTo(OutputStream.BaseStream);
            OutputStream.BaseStream.Flush();
            OutputStream.Flush();
        }
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