GetRemoteXmlFile.ashx

出自ProgWiki

用途

• 可取得遠端網站的Xml檔案, 並將Xml的語系進行轉碼(可繁簡体互轉)

程式碼

• 檔案: GetRemoteXmlFile.ashx

<%@ WebHandler Language="C#" Class="GetRemoteXmlFile" %>
 
using System;
using System.Web;
using System.Net;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
 
//簡体轉繁體範例
//http://localhost/GetRemoteXmlFile.ashx?src=GBK&dest=BIG5&url=http://localhost/gbk.xml
//繁體轉簡体範例
//http://localhost/GetRemoteXmlFile.ashx?src=BIG5&dest=GBK&url=http://localhost/big5.xml
 
public class GetRemoteXmlFile : IHttpHandler {
 
    public void ProcessRequest (HttpContext context) {
 
		string strLangSrc = "";
		string strLangDest = "";
 
		string strSrcUrl = "";
		string strText = "";
 
		Encoding encode_src;
		Encoding encode_dest;
 
		try
		{
			//取得來源的URL, 與指定來源與目的的語系
			strSrcUrl = context.Request["url"];
			strLangSrc = context.Request["src"];
			strLangDest = context.Request["dest"];
 
			try
			{
				encode_src = Encoding.GetEncoding(strLangSrc);
			}
			catch
			{
				encode_src = Encoding.Default;
			}
 
 
			strText = GetWebFile(strSrcUrl, encode_src);
		}
		catch
		{
		}
 
		try
		{
			encode_dest = Encoding.GetEncoding(strLangDest);
		}
		catch
		{
			encode_dest = Encoding.Default;
		}
 
		if (strLangSrc !=  strLangDest)
		{
			try
			{
				encode_src = Encoding.GetEncoding(strLangSrc);
			}
			catch
			{
				encode_src = Encoding.Default;
			}
 
			if ((strLangSrc.ToLower() == "gbk") || (strLangSrc.ToLower() == "gb2312"))
			{
				strText = ConvertStringS2T(strText);
			}
 
 
			Byte[] arTemp = Encoding.Convert(encode_src, encode_dest, encode_src.GetBytes(strText));
			strText = encode_dest.GetString(arTemp);
		}
 
		if ((strLangDest.ToLower() == "gbk") || (strLangDest.ToLower() == "gb2312"))
		{
			strText = ConvertStringT2S(strText);
		}
 
		context.Response.ContentType = "text/xml";
		context.Response.ContentEncoding = encode_dest;
 
		string str1 = string.Format(" encoding=\"{0}\"", strLangSrc);
		string str2 = string.Format(" encoding=\"{0}\"", strLangDest);
		strText = strText.Replace(str1, str2);
 
 
 
		//
		context.Response.Write(strText);
	}
 
	//以指定語系的方式, 取得遠端網站的xml檔案
	public string GetWebFile(string strUrl, Encoding encode_src)
	{
		string strRet = "";
		Uri uri = new Uri(strUrl);
		HttpWebRequest hwReq = WebRequest.Create(uri) as HttpWebRequest;
		using (HttpWebResponse hwRes = hwReq.GetResponse() as HttpWebResponse)
		{
			hwReq.Method = "GET";
			hwReq.KeepAlive = false;
			hwReq.Timeout = 10000;
 
			StreamReader reader = new StreamReader(hwRes.GetResponseStream(), encode_src);
			strRet = reader.ReadToEnd();
		}
		return strRet;
	}
 
    public bool IsReusable {
        get {
            return false;
        }
	}
 
	[DllImport("kernel32.dll", EntryPoint = "LCMapStringA")]
	public static extern int LCMapString(int Locale, int dwMapFlags, byte[] lpSrcStr, int cchSrc, byte[] lpDestStr, int cchDest);
 
	const int LCMAP_SIMPLIFIED_CHINESE = 0x02000000;
 
	const int LCMAP_TRADITIONAL_CHINESE = 0x04000000;
 
	//繁體轉簡体
	public static String ConvertStringT2S(String lines)
	{
 
		Encoding gb2312 = Encoding.GetEncoding(936);
 
		byte[] src = gb2312.GetBytes(lines);
 
		byte[] dest = new byte[src.Length];
 
		LCMapString(0x0804, LCMAP_SIMPLIFIED_CHINESE, src, -1, dest, src.Length);
 
		return gb2312.GetString(dest);
	}
 
	//簡体轉繁體
	public static String ConvertStringS2T(String lines)
	{
 
		Encoding gb2312 = Encoding.GetEncoding(936);
 
		byte[] src = gb2312.GetBytes(lines);
 
		byte[] dest = new byte[src.Length];
 
		LCMapString(0x0804, LCMAP_TRADITIONAL_CHINESE, src, -1, dest, src.Length);
 
		return gb2312.GetString(dest);
	}
 
}