Question

我有一个SimpleHttp服务器的以下代码：

   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，标题位于文本末尾，而BaseStream中的图像二进制文件首先出现在标题之前。输出样本（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并将标题放在最上面，得到的是这样的：

    HTTP/1.0 200 OK
    Content-Type: image/png
    Connection: close
    ä3ST)ëî!ðDFYLQ>qâ:oÂÀó?ÿÙT4ñ®KÛ'`ÃGKs\CGÔ«¾+L»ê±?0Íse3rïÁå·>"Ü¼;®N¦Ãõ5¨LZÂµL¯

在流编写器或BaseStream上使用flush并不重要。任何帮助！

Answer 1

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

不应使用BaseStream进行写入。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();
}

Answer 2

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

colors = {2013: 'r', 2014: 'b', 2015: 'g'}

fig, ax = plt.subplots(figsize=(10,10))
labels = []

for key, grp in dqData[dqData['team'] == 'team1'].groupby(['year']):
    g2 = grp.pivot(index='x', columns='month', values='y')
    ax = g2.plot(ax=ax, kind='line', c = colors[key])
    labels.append(key)

lines, _ = ax.get_legend_handles_labels()
ax.legend(lines, labels, loc='best')
plt.show()

StreamWriter输出BaseStream排在第一位

2 个答案: