自動判定ページエンコーディング
10678 ワード
/// <summary>
/// URL HTML
/// </summary>
/// <param name="url"></param>
/// <param name="encoding"> NULL </param>
/// <returns></returns>
public static string GetWebHtml(string url, Encoding encoding)
{
try
{
HttpWebRequest hwr = (HttpWebRequest)HttpWebRequest.Create(url);
HttpWebResponse res;
try
{
res = (HttpWebResponse)hwr.GetResponse();
}
catch
{
return string.Empty;
}
if (res.StatusCode == HttpStatusCode.OK)
{
using (Stream mystream = res.GetResponseStream())
{
// ，
if (encoding == null)
{
return DecodeData(mystream, res);
}
//
else
{
using (StreamReader reader = new StreamReader(mystream, encoding))
{
return reader.ReadToEnd();
}
}
}
}
return null;
}
catch
{
return null;
}
}
private static string DecodeData(Stream responseStream, HttpWebResponse response)
{
string name = null;
string text2 = response.Headers["content-type"];
if (text2 != null)
{
int index = text2.IndexOf("charset=");
if (index != -1)
{
name = text2.Substring(index + 8);
}
}
MemoryStream stream = new MemoryStream();
byte[] buffer = new byte[0x400];
for (int i = responseStream.Read(buffer, 0, buffer.Length); i > 0; i = responseStream.Read(buffer, 0, buffer.Length))
{
stream.Write(buffer, 0, i);
}
responseStream.Close();
if (name == null)
{
MemoryStream stream3 = stream;
stream3.Seek((long)0, SeekOrigin.Begin);
string text3 = new StreamReader(stream3, Encoding.ASCII).ReadToEnd();
if (text3 != null)
{
int startIndex = text3.IndexOf("charset=");
int num4 = -1;
if (startIndex != -1)
{
num4 = text3.IndexOf("\"", startIndex);
if (num4 != -1)
{
int num5 = startIndex + 8;
name = text3.Substring(num5, (num4 - num5) + 1).TrimEnd(new char[] { '>', '"' });
}
}
}
}
Encoding aSCII = null;
if (name == null)
{
aSCII = Encoding.GetEncoding("gb2312");
}
else
{
try
{
if (name == "GBK")
{
name = "GB2312";
}
aSCII = Encoding.GetEncoding(name);
}
catch
{
aSCII = Encoding.GetEncoding("gb2312");
}
}
stream.Seek((long)0, SeekOrigin.Begin);
StreamReader reader2 = new StreamReader(stream, aSCII);
return reader2.ReadToEnd();
}