2

我试图让这段代码工作得更好一点。我怀疑这是一次读取一个字节的循环。我找不到使用 gzip 解压缩的另一种方法。实现 aStreamReader很好，但它返回一个我无法传递给解压缩流的字符串。

有没有更好的办法？

byte[] bufffer = null;
List<byte> resourceBytes = new List<byte>();
int byteValue = 0;
WebResource resource = new WebResource();
HttpWebResponse webResponse = null;

try {
    HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(resourceUri);
    webRequest.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
    webRequest.Headers.Add(HttpRequestHeader.AcceptCharset, "ISO-8859-1,utf-8;q=0.7,*;q=0.7");
    webRequest.UserAgent = agent;
    webRequest.Accept = "text/html, application/xml;q=0.9, application/xhtml+xml, image/png, image/jpeg, image/gif, image/x-xbitmap, */*;q=0.1";
    webRequest.Credentials = CredentialCache.DefaultCredentials;
    webRequest.Referer = resourceUri.OriginalString;
    webRequest.Timeout = 5000;

    webResponse = (HttpWebResponse)webRequest.GetResponse();

    Stream webStream = webResponse.GetResponseStream();

    if (!string.IsNullOrEmpty(webResponse.ContentEncoding)) {
        if (webResponse.ContentEncoding.ToLower().Contains("gzip")) {
            webStream = new GZipStream(webStream, CompressionMode.Decompress);
        }
        else if (webResponse.ContentEncoding.ToLower().Contains("deflate")) {
            webStream = new DeflateStream(webStream, CompressionMode.Decompress);
        }
    }

    do {
        byteValue = webStream.ReadByte();

        if (byteValue != -1) {
            resourceBytes.Add((byte)byteValue);
        }

    } while (byteValue != -1);


    //Free up resources
    webStream.Close();
    webResponse.Close();

    bufffer = resourceBytes.ToArray();
4

3 回答 3

9

我同意 jmcd 的观点，即 WebClient 会简单得多，尤其是 WebClient.DownloadData。

重新实际的问题，问题是你正在读取单个字节，当你可能应该有一个固定的缓冲区和循环 - 即

int bytesRead;
byte[] buffer = new byte[1024];
while((bytesRead = webStream.Read(buffer, 0, buffer.Length)) > 0) {
  // process "bytesRead" worth of data from "buffer"
}

[编辑以强调] 重要的是您每次只处理“bytesRead”的数据；外面的一切都是垃圾。

于 2008-10-22T13:01:35.560 回答
1

WebClient类对您想做的事情没有用吗？

于 2008-10-22T12:56:39.737 回答
0

如果您希望将响应作为字符串，您可以这样做。

String ReponseText;

IO.StreamReader ResponseReader = New IO.StreamReader(webStream );
ReponseText= ResponseReader.ReadToEnd();

如果您想要一个实际的字节数组，请执行此操作（抱歉，不想为此转换为 C#）

'Declare Array Same size as response
Dim ResponseData(webStream .Length) As Byte 
'Read all the data at once
webStream.Read(ResponseData, 0, webStream .Length)
于 2008-10-22T12:56:57.177 回答