c# - 如何使用 WebResponse 下载 .wmv 文件

Question

我正在使用以下代码通过 WebResponse 获取 wmv 文件。我正在使用一个线程来调用这个函数:

static void GetPage(object data)
{
    // Cast the object to a ThreadInfo
    ThreadInfo ti = (ThreadInfo)data;

    // Request the URL
    WebResponse wr = WebRequest.Create(ti.url).GetResponse();

    // Display the value for the Content-Length header
    Console.WriteLine(ti.url + ": " + wr.Headers["Content-Length"]);
    string toBeSaved = @"C:\Users\Kevin\Downloads\TempFiles" + wr.ResponseUri.PathAndQuery;        
    StreamWriter streamWriter = new StreamWriter(toBeSaved);

    MemoryStream m = new MemoryStream();
    Stream receiveStream = wr.GetResponseStream();
    using (StreamReader sr = new StreamReader(receiveStream))
    {
        while (sr.Peek() >= 0)
        {
            m.WriteByte((byte)sr.Read());
        }
        streamWriter.Write(sr.ReadToEnd());
        sr.Close();
        wr.Close();
    }

    streamWriter.Flush();
    streamWriter.Close();

    // streamReader.Close();
    // Let the parent thread know the process is done
    ti.are.Set();

    wr.Close();
}

文件似乎可以正常下载，但 Windows Media Viewer 无法正确打开文件。关于无法支持文件类型的一些愚蠢的错误。

我错过了什么非常简单的事情？

Answer 1

您只需将其下载为二进制文件而不是文本文件。这里有一个方法应该可以为您解决问题。

public void DownloadFile(string url, string toLocalPath)
{
    byte[] result = null;
    byte[] buffer = new byte[4097];

    WebRequest wr = WebRequest.Create(url);

    WebResponse response = wr.GetResponse();
    Stream responseStream = response.GetResponseStream;
    MemoryStream memoryStream = new MemoryStream();

    int count = 0;

    do {
        count = responseStream.Read(buffer, 0, buffer.Length);
        memoryStream.Write(buffer, 0, count);

        if (count == 0) {
            break;
        }
    }
    while (true);

    result = memoryStream.ToArray;

    FileStream fs = new FileStream(toLocalPath, FileMode.OpenOrCreate, FileAccess.ReadWrite);

    fs.Write(result, 0, result.Length);

    fs.Close();
    memoryStream.Close();
    responseStream.Close();
}